From 56b5170c87ee3e30221eea7425c2fc4f0cc7d4a3 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Fri, 8 Jan 2021 22:42:48 +0000 Subject: semihosting: Move ARM semihosting code to shared directories MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This commit renames two files which provide ARM semihosting support so that they can be shared by other architectures: 1. target/arm/arm-semi.c -> hw/semihosting/common-semi.c 2. linux-user/arm/semihost.c -> linux-user/semihost.c The build system was modified use a new config variable, CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM softmmu and linux-user default configs. The contents of the source files has not been changed in this patch. Signed-off-by: Keith Packard [AJB: rename arm-compat-semi, select SEMIHOSTING] Signed-off-by: Alex Bennée Reviewed-by: Alistair Francis Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20210107170717.2098982-2-keithp@keithp.com> Message-Id: <20210108224256.2321-13-alex.bennee@linaro.org> --- default-configs/devices/arm-softmmu.mak | 1 + default-configs/targets/aarch64-linux-user.mak | 1 + default-configs/targets/aarch64_be-linux-user.mak | 1 + default-configs/targets/arm-linux-user.mak | 1 + default-configs/targets/armeb-linux-user.mak | 1 + hw/semihosting/Kconfig | 4 + hw/semihosting/arm-compat-semi.c | 1121 +++++++++++++++++++++ hw/semihosting/meson.build | 3 + linux-user/arm/meson.build | 3 - linux-user/arm/semihost.c | 76 -- linux-user/meson.build | 1 + linux-user/semihost.c | 76 ++ target/arm/arm-semi.c | 1121 --------------------- target/arm/meson.build | 2 - 14 files changed, 1210 insertions(+), 1202 deletions(-) create mode 100644 hw/semihosting/arm-compat-semi.c delete mode 100644 linux-user/arm/semihost.c create mode 100644 linux-user/semihost.c delete mode 100644 target/arm/arm-semi.c diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak index 08a32123b4..0500156a0c 100644 --- a/default-configs/devices/arm-softmmu.mak +++ b/default-configs/devices/arm-softmmu.mak @@ -42,4 +42,5 @@ CONFIG_FSL_IMX25=y CONFIG_FSL_IMX7=y CONFIG_FSL_IMX6UL=y CONFIG_SEMIHOSTING=y +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y CONFIG_ALLWINNER_H3=y diff --git a/default-configs/targets/aarch64-linux-user.mak b/default-configs/targets/aarch64-linux-user.mak index 163c9209f4..4713253709 100644 --- a/default-configs/targets/aarch64-linux-user.mak +++ b/default-configs/targets/aarch64-linux-user.mak @@ -2,3 +2,4 @@ TARGET_ARCH=aarch64 TARGET_BASE_ARCH=arm TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/default-configs/targets/aarch64_be-linux-user.mak b/default-configs/targets/aarch64_be-linux-user.mak index 4c953cf8c5..fae831558d 100644 --- a/default-configs/targets/aarch64_be-linux-user.mak +++ b/default-configs/targets/aarch64_be-linux-user.mak @@ -3,3 +3,4 @@ TARGET_BASE_ARCH=arm TARGET_WORDS_BIGENDIAN=y TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/default-configs/targets/arm-linux-user.mak b/default-configs/targets/arm-linux-user.mak index c7cd872e86..e741ffd4d3 100644 --- a/default-configs/targets/arm-linux-user.mak +++ b/default-configs/targets/arm-linux-user.mak @@ -3,3 +3,4 @@ TARGET_SYSTBL_ABI=common,oabi TARGET_SYSTBL=syscall.tbl TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/default-configs/targets/armeb-linux-user.mak b/default-configs/targets/armeb-linux-user.mak index 79bf10e99b..255e44e8b0 100644 --- a/default-configs/targets/armeb-linux-user.mak +++ b/default-configs/targets/armeb-linux-user.mak @@ -4,3 +4,4 @@ TARGET_SYSTBL=syscall.tbl TARGET_WORDS_BIGENDIAN=y TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/hw/semihosting/Kconfig b/hw/semihosting/Kconfig index efe0a30734..eaf3a20ef5 100644 --- a/hw/semihosting/Kconfig +++ b/hw/semihosting/Kconfig @@ -1,3 +1,7 @@ config SEMIHOSTING bool + +config ARM_COMPATIBLE_SEMIHOSTING + bool + select SEMIHOSTING diff --git a/hw/semihosting/arm-compat-semi.c b/hw/semihosting/arm-compat-semi.c new file mode 100644 index 0000000000..93360e28c7 --- /dev/null +++ b/hw/semihosting/arm-compat-semi.c @@ -0,0 +1,1121 @@ +/* + * Arm "Angel" semihosting syscalls + * + * Copyright (c) 2005, 2007 CodeSourcery. + * Copyright (c) 2019 Linaro + * Written by Paul Brook. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + * + * ARM Semihosting is documented in: + * Semihosting for AArch32 and AArch64 Release 2.0 + * https://static.docs.arm.com/100863/0200/semihosting.pdf + */ + +#include "qemu/osdep.h" + +#include "cpu.h" +#include "hw/semihosting/semihost.h" +#include "hw/semihosting/console.h" +#include "qemu/log.h" +#ifdef CONFIG_USER_ONLY +#include "qemu.h" + +#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024) +#else +#include "exec/gdbstub.h" +#include "qemu/cutils.h" +#include "hw/arm/boot.h" +#include "hw/boards.h" +#endif + +#define TARGET_SYS_OPEN 0x01 +#define TARGET_SYS_CLOSE 0x02 +#define TARGET_SYS_WRITEC 0x03 +#define TARGET_SYS_WRITE0 0x04 +#define TARGET_SYS_WRITE 0x05 +#define TARGET_SYS_READ 0x06 +#define TARGET_SYS_READC 0x07 +#define TARGET_SYS_ISTTY 0x09 +#define TARGET_SYS_SEEK 0x0a +#define TARGET_SYS_FLEN 0x0c +#define TARGET_SYS_TMPNAM 0x0d +#define TARGET_SYS_REMOVE 0x0e +#define TARGET_SYS_RENAME 0x0f +#define TARGET_SYS_CLOCK 0x10 +#define TARGET_SYS_TIME 0x11 +#define TARGET_SYS_SYSTEM 0x12 +#define TARGET_SYS_ERRNO 0x13 +#define TARGET_SYS_GET_CMDLINE 0x15 +#define TARGET_SYS_HEAPINFO 0x16 +#define TARGET_SYS_EXIT 0x18 +#define TARGET_SYS_SYNCCACHE 0x19 +#define TARGET_SYS_EXIT_EXTENDED 0x20 + +/* ADP_Stopped_ApplicationExit is used for exit(0), + * anything else is implemented as exit(1) */ +#define ADP_Stopped_ApplicationExit (0x20026) + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +#define GDB_O_RDONLY 0x000 +#define GDB_O_WRONLY 0x001 +#define GDB_O_RDWR 0x002 +#define GDB_O_APPEND 0x008 +#define GDB_O_CREAT 0x200 +#define GDB_O_TRUNC 0x400 +#define GDB_O_BINARY 0 + +static int gdb_open_modeflags[12] = { + GDB_O_RDONLY, + GDB_O_RDONLY | GDB_O_BINARY, + GDB_O_RDWR, + GDB_O_RDWR | GDB_O_BINARY, + GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC, + GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, + GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC, + GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, + GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND, + GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY, + GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND, + GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY +}; + +static int open_modeflags[12] = { + O_RDONLY, + O_RDONLY | O_BINARY, + O_RDWR, + O_RDWR | O_BINARY, + O_WRONLY | O_CREAT | O_TRUNC, + O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, + O_RDWR | O_CREAT | O_TRUNC, + O_RDWR | O_CREAT | O_TRUNC | O_BINARY, + O_WRONLY | O_CREAT | O_APPEND, + O_WRONLY | O_CREAT | O_APPEND | O_BINARY, + O_RDWR | O_CREAT | O_APPEND, + O_RDWR | O_CREAT | O_APPEND | O_BINARY +}; + +typedef enum GuestFDType { + GuestFDUnused = 0, + GuestFDHost = 1, + GuestFDGDB = 2, + GuestFDFeatureFile = 3, +} GuestFDType; + +/* + * Guest file descriptors are integer indexes into an array of + * these structures (we will dynamically resize as necessary). + */ +typedef struct GuestFD { + GuestFDType type; + union { + int hostfd; + target_ulong featurefile_offset; + }; +} GuestFD; + +static GArray *guestfd_array; + +/* + * Allocate a new guest file descriptor and return it; if we + * couldn't allocate a new fd then return -1. + * This is a fairly simplistic implementation because we don't + * expect that most semihosting guest programs will make very + * heavy use of opening and closing fds. + */ +static int alloc_guestfd(void) +{ + guint i; + + if (!guestfd_array) { + /* New entries zero-initialized, i.e. type GuestFDUnused */ + guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD)); + } + + /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */ + for (i = 1; i < guestfd_array->len; i++) { + GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i); + + if (gf->type == GuestFDUnused) { + return i; + } + } + + /* All elements already in use: expand the array */ + g_array_set_size(guestfd_array, i + 1); + return i; +} + +/* + * Look up the guestfd in the data structure; return NULL + * for out of bounds, but don't check whether the slot is unused. + * This is used internally by the other guestfd functions. + */ +static GuestFD *do_get_guestfd(int guestfd) +{ + if (!guestfd_array) { + return NULL; + } + + if (guestfd <= 0 || guestfd >= guestfd_array->len) { + return NULL; + } + + return &g_array_index(guestfd_array, GuestFD, guestfd); +} + +/* + * Associate the specified guest fd (which must have been + * allocated via alloc_fd() and not previously used) with + * the specified host/gdb fd. + */ +static void associate_guestfd(int guestfd, int hostfd) +{ + GuestFD *gf = do_get_guestfd(guestfd); + + assert(gf); + gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost; + gf->hostfd = hostfd; +} + +/* + * Deallocate the specified guest file descriptor. This doesn't + * close the host fd, it merely undoes the work of alloc_fd(). + */ +static void dealloc_guestfd(int guestfd) +{ + GuestFD *gf = do_get_guestfd(guestfd); + + assert(gf); + gf->type = GuestFDUnused; +} + +/* + * Given a guest file descriptor, get the associated struct. + * If the fd is not valid, return NULL. This is the function + * used by the various semihosting calls to validate a handle + * from the guest. + * Note: calling alloc_guestfd() or dealloc_guestfd() will + * invalidate any GuestFD* obtained by calling this function. + */ +static GuestFD *get_guestfd(int guestfd) +{ + GuestFD *gf = do_get_guestfd(guestfd); + + if (!gf || gf->type == GuestFDUnused) { + return NULL; + } + return gf; +} + +/* + * The semihosting API has no concept of its errno being thread-safe, + * as the API design predates SMP CPUs and was intended as a simple + * real-hardware set of debug functionality. For QEMU, we make the + * errno be per-thread in linux-user mode; in softmmu it is a simple + * global, and we assume that the guest takes care of avoiding any races. + */ +#ifndef CONFIG_USER_ONLY +static target_ulong syscall_err; + +#include "exec/softmmu-semi.h" +#endif + +static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code) +{ + if (code == (uint32_t)-1) { +#ifdef CONFIG_USER_ONLY + CPUState *cs = env_cpu(env); + TaskState *ts = cs->opaque; + + ts->swi_errno = errno; +#else + syscall_err = errno; +#endif + } + return code; +} + +static inline uint32_t get_swi_errno(CPUARMState *env) +{ +#ifdef CONFIG_USER_ONLY + CPUState *cs = env_cpu(env); + TaskState *ts = cs->opaque; + + return ts->swi_errno; +#else + return syscall_err; +#endif +} + +static target_ulong arm_semi_syscall_len; + +static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err) +{ + ARMCPU *cpu = ARM_CPU(cs); + CPUARMState *env = &cpu->env; + target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0]; + + if (ret == (target_ulong)-1) { + errno = err; + set_swi_errno(env, -1); + reg0 = ret; + } else { + /* Fixup syscalls that use nonstardard return conventions. */ + switch (reg0) { + case TARGET_SYS_WRITE: + case TARGET_SYS_READ: + reg0 = arm_semi_syscall_len - ret; + break; + case TARGET_SYS_SEEK: + reg0 = 0; + break; + default: + reg0 = ret; + break; + } + } + if (is_a64(env)) { + env->xregs[0] = reg0; + } else { + env->regs[0] = reg0; + } +} + +static target_ulong arm_flen_buf(ARMCPU *cpu) +{ + /* Return an address in target memory of 64 bytes where the remote + * gdb should write its stat struct. (The format of this structure + * is defined by GDB's remote protocol and is not target-specific.) + * We put this on the guest's stack just below SP. + */ + CPUARMState *env = &cpu->env; + target_ulong sp; + + if (is_a64(env)) { + sp = env->xregs[31]; + } else { + sp = env->regs[13]; + } + + return sp - 64; +} + +static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err) +{ + ARMCPU *cpu = ARM_CPU(cs); + CPUARMState *env = &cpu->env; + /* The size is always stored in big-endian order, extract + the value. We assume the size always fit in 32 bits. */ + uint32_t size; + cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0); + size = be32_to_cpu(size); + if (is_a64(env)) { + env->xregs[0] = size; + } else { + env->regs[0] = size; + } + errno = err; + set_swi_errno(env, -1); +} + +static int arm_semi_open_guestfd; + +static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err) +{ + ARMCPU *cpu = ARM_CPU(cs); + CPUARMState *env = &cpu->env; + if (ret == (target_ulong)-1) { + errno = err; + set_swi_errno(env, -1); + dealloc_guestfd(arm_semi_open_guestfd); + } else { + associate_guestfd(arm_semi_open_guestfd, ret); + ret = arm_semi_open_guestfd; + } + + if (is_a64(env)) { + env->xregs[0] = ret; + } else { + env->regs[0] = ret; + } +} + +static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb, + const char *fmt, ...) +{ + va_list va; + CPUARMState *env = &cpu->env; + + va_start(va, fmt); + gdb_do_syscallv(cb, fmt, va); + va_end(va); + + /* + * FIXME: in softmmu mode, the gdbstub will schedule our callback + * to occur, but will not actually call it to complete the syscall + * until after this function has returned and we are back in the + * CPU main loop. Therefore callers to this function must not + * do anything with its return value, because it is not necessarily + * the result of the syscall, but could just be the old value of X0. + * The only thing safe to do with this is that the callers of + * do_arm_semihosting() will write it straight back into X0. + * (In linux-user mode, the callback will have happened before + * gdb_do_syscallv() returns.) + * + * We should tidy this up so neither this function nor + * do_arm_semihosting() return a value, so the mistake of + * doing something with the return value is not possible to make. + */ + + return is_a64(env) ? env->xregs[0] : env->regs[0]; +} + +/* + * Types for functions implementing various semihosting calls + * for specific types of guest file descriptor. These must all + * do the work and return the required return value for the guest, + * setting the guest errno if appropriate. + */ +typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf); +typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len); +typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len); +typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf); +typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf, + target_ulong offset); +typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf); + +static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf) +{ + CPUARMState *env = &cpu->env; + + /* + * Only close the underlying host fd if it's one we opened on behalf + * of the guest in SYS_OPEN. + */ + if (gf->hostfd == STDIN_FILENO || + gf->hostfd == STDOUT_FILENO || + gf->hostfd == STDERR_FILENO) { + return 0; + } + return set_swi_errno(env, close(gf->hostfd)); +} + +static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + uint32_t ret; + CPUARMState *env = &cpu->env; + char *s = lock_user(VERIFY_READ, buf, len, 1); + if (!s) { + /* Return bytes not written on error */ + return len; + } + ret = set_swi_errno(env, write(gf->hostfd, s, len)); + unlock_user(s, buf, 0); + if (ret == (uint32_t)-1) { + ret = 0; + } + /* Return bytes not written */ + return len - ret; +} + +static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + uint32_t ret; + CPUARMState *env = &cpu->env; + char *s = lock_user(VERIFY_WRITE, buf, len, 0); + if (!s) { + /* return bytes not read */ + return len; + } + do { + ret = set_swi_errno(env, read(gf->hostfd, s, len)); + } while (ret == -1 && errno == EINTR); + unlock_user(s, buf, len); + if (ret == (uint32_t)-1) { + ret = 0; + } + /* Return bytes not read */ + return len - ret; +} + +static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf) +{ + return isatty(gf->hostfd); +} + +static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset) +{ + CPUARMState *env = &cpu->env; + uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET)); + if (ret == (uint32_t)-1) { + return -1; + } + return 0; +} + +static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf) +{ + CPUARMState *env = &cpu->env; + struct stat buf; + uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf)); + if (ret == (uint32_t)-1) { + return -1; + } + return buf.st_size; +} + +static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf) +{ + return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd); +} + +static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + arm_semi_syscall_len = len; + return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x", + gf->hostfd, buf, len); +} + +static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + arm_semi_syscall_len = len; + return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x", + gf->hostfd, buf, len); +} + +static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf) +{ + return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd); +} + +static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset) +{ + return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0", + gf->hostfd, offset); +} + +static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf) +{ + return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x", + gf->hostfd, arm_flen_buf(cpu)); +} + +#define SHFB_MAGIC_0 0x53 +#define SHFB_MAGIC_1 0x48 +#define SHFB_MAGIC_2 0x46 +#define SHFB_MAGIC_3 0x42 + +/* Feature bits reportable in feature byte 0 */ +#define SH_EXT_EXIT_EXTENDED (1 << 0) +#define SH_EXT_STDOUT_STDERR (1 << 1) + +static const uint8_t featurefile_data[] = { + SHFB_MAGIC_0, + SHFB_MAGIC_1, + SHFB_MAGIC_2, + SHFB_MAGIC_3, + SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */ +}; + +static void init_featurefile_guestfd(int guestfd) +{ + GuestFD *gf = do_get_guestfd(guestfd); + + assert(gf); + gf->type = GuestFDFeatureFile; + gf->featurefile_offset = 0; +} + +static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf) +{ + /* Nothing to do */ + return 0; +} + +static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + /* This fd can never be open for writing */ + CPUARMState *env = &cpu->env; + + errno = EBADF; + return set_swi_errno(env, -1); +} + +static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf, + target_ulong buf, uint32_t len) +{ + uint32_t i; +#ifndef CONFIG_USER_ONLY + CPUARMState *env = &cpu->env; +#endif + char *s; + + s = lock_user(VERIFY_WRITE, buf, len, 0); + if (!s) { + return len; + } + + for (i = 0; i < len; i++) { + if (gf->featurefile_offset >= sizeof(featurefile_data)) { + break; + } + s[i] = featurefile_data[gf->featurefile_offset]; + gf->featurefile_offset++; + } + + unlock_user(s, buf, len); + + /* Return number of bytes not read */ + return len - i; +} + +static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf) +{ + return 0; +} + +static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf, + target_ulong offset) +{ + gf->featurefile_offset = offset; + return 0; +} + +static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf) +{ + return sizeof(featurefile_data); +} + +typedef struct GuestFDFunctions { + sys_closefn *closefn; + sys_writefn *writefn; + sys_readfn *readfn; + sys_isattyfn *isattyfn; + sys_seekfn *seekfn; + sys_flenfn *flenfn; +} GuestFDFunctions; + +static const GuestFDFunctions guestfd_fns[] = { + [GuestFDHost] = { + .closefn = host_closefn, + .writefn = host_writefn, + .readfn = host_readfn, + .isattyfn = host_isattyfn, + .seekfn = host_seekfn, + .flenfn = host_flenfn, + }, + [GuestFDGDB] = { + .closefn = gdb_closefn, + .writefn = gdb_writefn, + .readfn = gdb_readfn, + .isattyfn = gdb_isattyfn, + .seekfn = gdb_seekfn, + .flenfn = gdb_flenfn, + }, + [GuestFDFeatureFile] = { + .closefn = featurefile_closefn, + .writefn = featurefile_writefn, + .readfn = featurefile_readfn, + .isattyfn = featurefile_isattyfn, + .seekfn = featurefile_seekfn, + .flenfn = featurefile_flenfn, + }, +}; + +/* Read the input value from the argument block; fail the semihosting + * call if the memory read fails. + */ +#define GET_ARG(n) do { \ + if (is_a64(env)) { \ + if (get_user_u64(arg ## n, args + (n) * 8)) { \ + errno = EFAULT; \ + return set_swi_errno(env, -1); \ + } \ + } else { \ + if (get_user_u32(arg ## n, args + (n) * 4)) { \ + errno = EFAULT; \ + return set_swi_errno(env, -1); \ + } \ + } \ +} while (0) + +#define SET_ARG(n, val) \ + (is_a64(env) ? \ + put_user_u64(val, args + (n) * 8) : \ + put_user_u32(val, args + (n) * 4)) + +/* + * Do a semihosting call. + * + * The specification always says that the "return register" either + * returns a specific value or is corrupted, so we don't need to + * report to our caller whether we are returning a value or trying to + * leave the register unchanged. We use 0xdeadbeef as the return value + * when there isn't a defined return value for the call. + */ +target_ulong do_arm_semihosting(CPUARMState *env) +{ + ARMCPU *cpu = env_archcpu(env); + CPUState *cs = env_cpu(env); + target_ulong args; + target_ulong arg0, arg1, arg2, arg3; + char * s; + int nr; + uint32_t ret; + uint32_t len; + GuestFD *gf; + + if (is_a64(env)) { + /* Note that the syscall number is in W0, not X0 */ + nr = env->xregs[0] & 0xffffffffU; + args = env->xregs[1]; + } else { + nr = env->regs[0]; + args = env->regs[1]; + } + + switch (nr) { + case TARGET_SYS_OPEN: + { + int guestfd; + + GET_ARG(0); + GET_ARG(1); + GET_ARG(2); + s = lock_user_string(arg0); + if (!s) { + errno = EFAULT; + return set_swi_errno(env, -1); + } + if (arg1 >= 12) { + unlock_user(s, arg0, 0); + errno = EINVAL; + return set_swi_errno(env, -1); + } + + guestfd = alloc_guestfd(); + if (guestfd < 0) { + unlock_user(s, arg0, 0); + errno = EMFILE; + return set_swi_errno(env, -1); + } + + if (strcmp(s, ":tt") == 0) { + int result_fileno; + + /* + * We implement SH_EXT_STDOUT_STDERR, so: + * open for read == stdin + * open for write == stdout + * open for append == stderr + */ + if (arg1 < 4) { + result_fileno = STDIN_FILENO; + } else if (arg1 < 8) { + result_fileno = STDOUT_FILENO; + } else { + result_fileno = STDERR_FILENO; + } + associate_guestfd(guestfd, result_fileno); + unlock_user(s, arg0, 0); + return guestfd; + } + if (strcmp(s, ":semihosting-features") == 0) { + unlock_user(s, arg0, 0); + /* We must fail opens for modes other than 0 ('r') or 1 ('rb') */ + if (arg1 != 0 && arg1 != 1) { + dealloc_guestfd(guestfd); + errno = EACCES; + return set_swi_errno(env, -1); + } + init_featurefile_guestfd(guestfd); + return guestfd; + } + + if (use_gdb_syscalls()) { + arm_semi_open_guestfd = guestfd; + ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0, + (int)arg2 + 1, gdb_open_modeflags[arg1]); + } else { + ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644)); + if (ret == (uint32_t)-1) { + dealloc_guestfd(guestfd); + } else { + associate_guestfd(guestfd, ret); + ret = guestfd; + } + } + unlock_user(s, arg0, 0); + return ret; + } + case TARGET_SYS_CLOSE: + GET_ARG(0); + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + ret = guestfd_fns[gf->type].closefn(cpu, gf); + dealloc_guestfd(arg0); + return ret; + case TARGET_SYS_WRITEC: + qemu_semihosting_console_outc(env, args); + return 0xdeadbeef; + case TARGET_SYS_WRITE0: + return qemu_semihosting_console_outs(env, args); + case TARGET_SYS_WRITE: + GET_ARG(0); + GET_ARG(1); + GET_ARG(2); + len = arg2; + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len); + case TARGET_SYS_READ: + GET_ARG(0); + GET_ARG(1); + GET_ARG(2); + len = arg2; + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len); + case TARGET_SYS_READC: + return qemu_semihosting_console_inc(env); + case TARGET_SYS_ISTTY: + GET_ARG(0); + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + return guestfd_fns[gf->type].isattyfn(cpu, gf); + case TARGET_SYS_SEEK: + GET_ARG(0); + GET_ARG(1); + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + return guestfd_fns[gf->type].seekfn(cpu, gf, arg1); + case TARGET_SYS_FLEN: + GET_ARG(0); + + gf = get_guestfd(arg0); + if (!gf) { + errno = EBADF; + return set_swi_errno(env, -1); + } + + return guestfd_fns[gf->type].flenfn(cpu, gf); + case TARGET_SYS_TMPNAM: + qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__); + return -1; + case TARGET_SYS_REMOVE: + GET_ARG(0); + GET_ARG(1); + if (use_gdb_syscalls()) { + ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s", + arg0, (int)arg1 + 1); + } else { + s = lock_user_string(arg0); + if (!s) { + errno = EFAULT; + return set_swi_errno(env, -1); + } + ret = set_swi_errno(env, remove(s)); + unlock_user(s, arg0, 0); + } + return ret; + case TARGET_SYS_RENAME: + GET_ARG(0); + GET_ARG(1); + GET_ARG(2); + GET_ARG(3); + if (use_gdb_syscalls()) { + return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s", + arg0, (int)arg1 + 1, arg2, (int)arg3 + 1); + } else { + char *s2; + s = lock_user_string(arg0); + s2 = lock_user_string(arg2); + if (!s || !s2) { + errno = EFAULT; + ret = set_swi_errno(env, -1); + } else { + ret = set_swi_errno(env, rename(s, s2)); + } + if (s2) + unlock_user(s2, arg2, 0); + if (s) + unlock_user(s, arg0, 0); + return ret; + } + case TARGET_SYS_CLOCK: + return clock() / (CLOCKS_PER_SEC / 100); + case TARGET_SYS_TIME: + return set_swi_errno(env, time(NULL)); + case TARGET_SYS_SYSTEM: + GET_ARG(0); + GET_ARG(1); + if (use_gdb_syscalls()) { + return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s", + arg0, (int)arg1 + 1); + } else { + s = lock_user_string(arg0); + if (!s) { + errno = EFAULT; + return set_swi_errno(env, -1); + } + ret = set_swi_errno(env, system(s)); + unlock_user(s, arg0, 0); + return ret; + } + case TARGET_SYS_ERRNO: + return get_swi_errno(env); + case TARGET_SYS_GET_CMDLINE: + { + /* Build a command-line from the original argv. + * + * The inputs are: + * * arg0, pointer to a buffer of at least the size + * specified in arg1. + * * arg1, size of the buffer pointed to by arg0 in + * bytes. + * + * The outputs are: + * * arg0, pointer to null-terminated string of the + * command line. + * * arg1, length of the string pointed to by arg0. + */ + + char *output_buffer; + size_t input_size; + size_t output_size; + int status = 0; +#if !defined(CONFIG_USER_ONLY) + const char *cmdline; +#else + TaskState *ts = cs->opaque; +#endif + GET_ARG(0); + GET_ARG(1); + input_size = arg1; + /* Compute the size of the output string. */ +#if !defined(CONFIG_USER_ONLY) + cmdline = semihosting_get_cmdline(); + if (cmdline == NULL) { + cmdline = ""; /* Default to an empty line. */ + } + output_size = strlen(cmdline) + 1; /* Count terminating 0. */ +#else + unsigned int i; + + output_size = ts->info->arg_end - ts->info->arg_start; + if (!output_size) { + /* + * We special-case the "empty command line" case (argc==0). + * Just provide the terminating 0. + */ + output_size = 1; + } +#endif + + if (output_size > input_size) { + /* Not enough space to store command-line arguments. */ + errno = E2BIG; + return set_swi_errno(env, -1); + } + + /* Adjust the command-line length. */ + if (SET_ARG(1, output_size - 1)) { + /* Couldn't write back to argument block */ + errno = EFAULT; + return set_swi_errno(env, -1); + } + + /* Lock the buffer on the ARM side. */ + output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0); + if (!output_buffer) { + errno = EFAULT; + return set_swi_errno(env, -1); + } + + /* Copy the command-line arguments. */ +#if !defined(CONFIG_USER_ONLY) + pstrcpy(output_buffer, output_size, cmdline); +#else + if (output_size == 1) { + /* Empty command-line. */ + output_buffer[0] = '\0'; + goto out; + } + + if (copy_from_user(output_buffer, ts->info->arg_start, + output_size)) { + errno = EFAULT; + status = set_swi_errno(env, -1); + goto out; + } + + /* Separate arguments by white spaces. */ + for (i = 0; i < output_size - 1; i++) { + if (output_buffer[i] == 0) { + output_buffer[i] = ' '; + } + } + out: +#endif + /* Unlock the buffer on the ARM side. */ + unlock_user(output_buffer, arg0, output_size); + + return status; + } + case TARGET_SYS_HEAPINFO: + { + target_ulong retvals[4]; + target_ulong limit; + int i; +#ifdef CONFIG_USER_ONLY + TaskState *ts = cs->opaque; +#else + const struct arm_boot_info *info = env->boot_info; + target_ulong rambase = info->loader_start; +#endif + + GET_ARG(0); + +#ifdef CONFIG_USER_ONLY + /* + * Some C libraries assume the heap immediately follows .bss, so + * allocate it using sbrk. + */ + if (!ts->heap_limit) { + abi_ulong ret; + + ts->heap_base = do_brk(0); + limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; + /* Try a big heap, and reduce the size if that fails. */ + for (;;) { + ret = do_brk(limit); + if (ret >= limit) { + break; + } + limit = (ts->heap_base >> 1) + (limit >> 1); + } + ts->heap_limit = limit; + } + + retvals[0] = ts->heap_base; + retvals[1] = ts->heap_limit; + retvals[2] = ts->stack_base; + retvals[3] = 0; /* Stack limit. */ +#else + limit = current_machine->ram_size; + /* TODO: Make this use the limit of the loaded application. */ + retvals[0] = rambase + limit / 2; + retvals[1] = rambase + limit; + retvals[2] = rambase + limit; /* Stack base */ + retvals[3] = rambase; /* Stack limit. */ +#endif + + for (i = 0; i < ARRAY_SIZE(retvals); i++) { + bool fail; + + if (is_a64(env)) { + fail = put_user_u64(retvals[i], arg0 + i * 8); + } else { + fail = put_user_u32(retvals[i], arg0 + i * 4); + } + + if (fail) { + /* Couldn't write back to argument block */ + errno = EFAULT; + return set_swi_errno(env, -1); + } + } + return 0; + } + case TARGET_SYS_EXIT: + case TARGET_SYS_EXIT_EXTENDED: + if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) { + /* + * The A64 version of SYS_EXIT takes a parameter block, + * so the application-exit type can return a subcode which + * is the exit status code from the application. + * SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function + * which allows A32/T32 guests to also provide a status code. + */ + GET_ARG(0); + GET_ARG(1); + + if (arg0 == ADP_Stopped_ApplicationExit) { + ret = arg1; + } else { + ret = 1; + } + } else { + /* + * The A32/T32 version of SYS_EXIT specifies only + * Stopped_ApplicationExit as normal exit, but does not + * allow the guest to specify the exit status code. + * Everything else is considered an error. + */ + ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1; + } + gdb_exit(ret); + exit(ret); + case TARGET_SYS_SYNCCACHE: + /* + * Clean the D-cache and invalidate the I-cache for the specified + * virtual address range. This is a nop for us since we don't + * implement caches. This is only present on A64. + */ + if (is_a64(env)) { + return 0; + } + /* fall through -- invalid for A32/T32 */ + default: + fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr); + cpu_dump_state(cs, stderr, 0); + abort(); + } +} diff --git a/hw/semihosting/meson.build b/hw/semihosting/meson.build index f40ac574c4..ea8090abe3 100644 --- a/hw/semihosting/meson.build +++ b/hw/semihosting/meson.build @@ -2,3 +2,6 @@ specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files( 'config.c', 'console.c', )) + +specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'], + if_true: files('arm-compat-semi.c')) diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build index 432984b58e..5a93c925cf 100644 --- a/linux-user/arm/meson.build +++ b/linux-user/arm/meson.build @@ -1,6 +1,3 @@ -linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c')) -linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c')) - subdir('nwfpe') syscall_nr_generators += { diff --git a/linux-user/arm/semihost.c b/linux-user/arm/semihost.c deleted file mode 100644 index a1f0f6050e..0000000000 --- a/linux-user/arm/semihost.c +++ /dev/null @@ -1,76 +0,0 @@ -/* - * ARM Semihosting Console Support - * - * Copyright (c) 2019 Linaro Ltd - * - * Currently ARM is unique in having support for semihosting support - * in linux-user. So for now we implement the common console API but - * just for arm linux-user. - * - * SPDX-License-Identifier: GPL-2.0-or-later - */ - -#include "qemu/osdep.h" -#include "cpu.h" -#include "hw/semihosting/console.h" -#include "qemu.h" -#include - -int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr) -{ - int len = target_strlen(addr); - void *s; - if (len < 0){ - qemu_log_mask(LOG_GUEST_ERROR, - "%s: passed inaccessible address " TARGET_FMT_lx, - __func__, addr); - return 0; - } - s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1); - g_assert(s); /* target_strlen has already verified this will work */ - len = write(STDERR_FILENO, s, len); - unlock_user(s, addr, 0); - return len; -} - -void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr) -{ - char c; - - if (get_user_u8(c, addr)) { - qemu_log_mask(LOG_GUEST_ERROR, - "%s: passed inaccessible address " TARGET_FMT_lx, - __func__, addr); - } else { - if (write(STDERR_FILENO, &c, 1) != 1) { - qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure", - __func__); - } - } -} - -/* - * For linux-user we can safely block. However as we want to return as - * soon as a character is read we need to tweak the termio to disable - * line buffering. We restore the old mode afterwards in case the - * program is expecting more normal behaviour. This is slow but - * nothing using semihosting console reading is expecting to be fast. - */ -target_ulong qemu_semihosting_console_inc(CPUArchState *env) -{ - uint8_t c; - struct termios old_tio, new_tio; - - /* Disable line-buffering and echo */ - tcgetattr(STDIN_FILENO, &old_tio); - new_tio = old_tio; - new_tio.c_lflag &= (~ICANON & ~ECHO); - tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); - - c = getchar(); - - /* restore config */ - tcsetattr(STDIN_FILENO, TCSANOW, &old_tio); - - return (target_ulong) c; -} diff --git a/linux-user/meson.build b/linux-user/meson.build index 2b94e4ba24..7fe28d659e 100644 --- a/linux-user/meson.build +++ b/linux-user/meson.build @@ -16,6 +16,7 @@ linux_user_ss.add(rt) linux_user_ss.add(when: 'TARGET_HAS_BFLT', if_true: files('flatload.c')) linux_user_ss.add(when: 'TARGET_I386', if_true: files('vm86.c')) +linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('semihost.c')) syscall_nr_generators = {} diff --git a/linux-user/semihost.c b/linux-user/semihost.c new file mode 100644 index 0000000000..a1f0f6050e --- /dev/null +++ b/linux-user/semihost.c @@ -0,0 +1,76 @@ +/* + * ARM Semihosting Console Support + * + * Copyright (c) 2019 Linaro Ltd + * + * Currently ARM is unique in having support for semihosting support + * in linux-user. So for now we implement the common console API but + * just for arm linux-user. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "hw/semihosting/console.h" +#include "qemu.h" +#include + +int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr) +{ + int len = target_strlen(addr); + void *s; + if (len < 0){ + qemu_log_mask(LOG_GUEST_ERROR, + "%s: passed inaccessible address " TARGET_FMT_lx, + __func__, addr); + return 0; + } + s = lock_user(VERIFY_READ, addr, (long)(len + 1), 1); + g_assert(s); /* target_strlen has already verified this will work */ + len = write(STDERR_FILENO, s, len); + unlock_user(s, addr, 0); + return len; +} + +void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr) +{ + char c; + + if (get_user_u8(c, addr)) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: passed inaccessible address " TARGET_FMT_lx, + __func__, addr); + } else { + if (write(STDERR_FILENO, &c, 1) != 1) { + qemu_log_mask(LOG_UNIMP, "%s: unexpected write to stdout failure", + __func__); + } + } +} + +/* + * For linux-user we can safely block. However as we want to return as + * soon as a character is read we need to tweak the termio to disable + * line buffering. We restore the old mode afterwards in case the + * program is expecting more normal behaviour. This is slow but + * nothing using semihosting console reading is expecting to be fast. + */ +target_ulong qemu_semihosting_console_inc(CPUArchState *env) +{ + uint8_t c; + struct termios old_tio, new_tio; + + /* Disable line-buffering and echo */ + tcgetattr(STDIN_FILENO, &old_tio); + new_tio = old_tio; + new_tio.c_lflag &= (~ICANON & ~ECHO); + tcsetattr(STDIN_FILENO, TCSANOW, &new_tio); + + c = getchar(); + + /* restore config */ + tcsetattr(STDIN_FILENO, TCSANOW, &old_tio); + + return (target_ulong) c; +} diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c deleted file mode 100644 index 93360e28c7..0000000000 --- a/target/arm/arm-semi.c +++ /dev/null @@ -1,1121 +0,0 @@ -/* - * Arm "Angel" semihosting syscalls - * - * Copyright (c) 2005, 2007 CodeSourcery. - * Copyright (c) 2019 Linaro - * Written by Paul Brook. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see . - * - * ARM Semihosting is documented in: - * Semihosting for AArch32 and AArch64 Release 2.0 - * https://static.docs.arm.com/100863/0200/semihosting.pdf - */ - -#include "qemu/osdep.h" - -#include "cpu.h" -#include "hw/semihosting/semihost.h" -#include "hw/semihosting/console.h" -#include "qemu/log.h" -#ifdef CONFIG_USER_ONLY -#include "qemu.h" - -#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024) -#else -#include "exec/gdbstub.h" -#include "qemu/cutils.h" -#include "hw/arm/boot.h" -#include "hw/boards.h" -#endif - -#define TARGET_SYS_OPEN 0x01 -#define TARGET_SYS_CLOSE 0x02 -#define TARGET_SYS_WRITEC 0x03 -#define TARGET_SYS_WRITE0 0x04 -#define TARGET_SYS_WRITE 0x05 -#define TARGET_SYS_READ 0x06 -#define TARGET_SYS_READC 0x07 -#define TARGET_SYS_ISTTY 0x09 -#define TARGET_SYS_SEEK 0x0a -#define TARGET_SYS_FLEN 0x0c -#define TARGET_SYS_TMPNAM 0x0d -#define TARGET_SYS_REMOVE 0x0e -#define TARGET_SYS_RENAME 0x0f -#define TARGET_SYS_CLOCK 0x10 -#define TARGET_SYS_TIME 0x11 -#define TARGET_SYS_SYSTEM 0x12 -#define TARGET_SYS_ERRNO 0x13 -#define TARGET_SYS_GET_CMDLINE 0x15 -#define TARGET_SYS_HEAPINFO 0x16 -#define TARGET_SYS_EXIT 0x18 -#define TARGET_SYS_SYNCCACHE 0x19 -#define TARGET_SYS_EXIT_EXTENDED 0x20 - -/* ADP_Stopped_ApplicationExit is used for exit(0), - * anything else is implemented as exit(1) */ -#define ADP_Stopped_ApplicationExit (0x20026) - -#ifndef O_BINARY -#define O_BINARY 0 -#endif - -#define GDB_O_RDONLY 0x000 -#define GDB_O_WRONLY 0x001 -#define GDB_O_RDWR 0x002 -#define GDB_O_APPEND 0x008 -#define GDB_O_CREAT 0x200 -#define GDB_O_TRUNC 0x400 -#define GDB_O_BINARY 0 - -static int gdb_open_modeflags[12] = { - GDB_O_RDONLY, - GDB_O_RDONLY | GDB_O_BINARY, - GDB_O_RDWR, - GDB_O_RDWR | GDB_O_BINARY, - GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC, - GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, - GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC, - GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, - GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND, - GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY, - GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND, - GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY -}; - -static int open_modeflags[12] = { - O_RDONLY, - O_RDONLY | O_BINARY, - O_RDWR, - O_RDWR | O_BINARY, - O_WRONLY | O_CREAT | O_TRUNC, - O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, - O_RDWR | O_CREAT | O_TRUNC, - O_RDWR | O_CREAT | O_TRUNC | O_BINARY, - O_WRONLY | O_CREAT | O_APPEND, - O_WRONLY | O_CREAT | O_APPEND | O_BINARY, - O_RDWR | O_CREAT | O_APPEND, - O_RDWR | O_CREAT | O_APPEND | O_BINARY -}; - -typedef enum GuestFDType { - GuestFDUnused = 0, - GuestFDHost = 1, - GuestFDGDB = 2, - GuestFDFeatureFile = 3, -} GuestFDType; - -/* - * Guest file descriptors are integer indexes into an array of - * these structures (we will dynamically resize as necessary). - */ -typedef struct GuestFD { - GuestFDType type; - union { - int hostfd; - target_ulong featurefile_offset; - }; -} GuestFD; - -static GArray *guestfd_array; - -/* - * Allocate a new guest file descriptor and return it; if we - * couldn't allocate a new fd then return -1. - * This is a fairly simplistic implementation because we don't - * expect that most semihosting guest programs will make very - * heavy use of opening and closing fds. - */ -static int alloc_guestfd(void) -{ - guint i; - - if (!guestfd_array) { - /* New entries zero-initialized, i.e. type GuestFDUnused */ - guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD)); - } - - /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */ - for (i = 1; i < guestfd_array->len; i++) { - GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i); - - if (gf->type == GuestFDUnused) { - return i; - } - } - - /* All elements already in use: expand the array */ - g_array_set_size(guestfd_array, i + 1); - return i; -} - -/* - * Look up the guestfd in the data structure; return NULL - * for out of bounds, but don't check whether the slot is unused. - * This is used internally by the other guestfd functions. - */ -static GuestFD *do_get_guestfd(int guestfd) -{ - if (!guestfd_array) { - return NULL; - } - - if (guestfd <= 0 || guestfd >= guestfd_array->len) { - return NULL; - } - - return &g_array_index(guestfd_array, GuestFD, guestfd); -} - -/* - * Associate the specified guest fd (which must have been - * allocated via alloc_fd() and not previously used) with - * the specified host/gdb fd. - */ -static void associate_guestfd(int guestfd, int hostfd) -{ - GuestFD *gf = do_get_guestfd(guestfd); - - assert(gf); - gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost; - gf->hostfd = hostfd; -} - -/* - * Deallocate the specified guest file descriptor. This doesn't - * close the host fd, it merely undoes the work of alloc_fd(). - */ -static void dealloc_guestfd(int guestfd) -{ - GuestFD *gf = do_get_guestfd(guestfd); - - assert(gf); - gf->type = GuestFDUnused; -} - -/* - * Given a guest file descriptor, get the associated struct. - * If the fd is not valid, return NULL. This is the function - * used by the various semihosting calls to validate a handle - * from the guest. - * Note: calling alloc_guestfd() or dealloc_guestfd() will - * invalidate any GuestFD* obtained by calling this function. - */ -static GuestFD *get_guestfd(int guestfd) -{ - GuestFD *gf = do_get_guestfd(guestfd); - - if (!gf || gf->type == GuestFDUnused) { - return NULL; - } - return gf; -} - -/* - * The semihosting API has no concept of its errno being thread-safe, - * as the API design predates SMP CPUs and was intended as a simple - * real-hardware set of debug functionality. For QEMU, we make the - * errno be per-thread in linux-user mode; in softmmu it is a simple - * global, and we assume that the guest takes care of avoiding any races. - */ -#ifndef CONFIG_USER_ONLY -static target_ulong syscall_err; - -#include "exec/softmmu-semi.h" -#endif - -static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code) -{ - if (code == (uint32_t)-1) { -#ifdef CONFIG_USER_ONLY - CPUState *cs = env_cpu(env); - TaskState *ts = cs->opaque; - - ts->swi_errno = errno; -#else - syscall_err = errno; -#endif - } - return code; -} - -static inline uint32_t get_swi_errno(CPUARMState *env) -{ -#ifdef CONFIG_USER_ONLY - CPUState *cs = env_cpu(env); - TaskState *ts = cs->opaque; - - return ts->swi_errno; -#else - return syscall_err; -#endif -} - -static target_ulong arm_semi_syscall_len; - -static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err) -{ - ARMCPU *cpu = ARM_CPU(cs); - CPUARMState *env = &cpu->env; - target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0]; - - if (ret == (target_ulong)-1) { - errno = err; - set_swi_errno(env, -1); - reg0 = ret; - } else { - /* Fixup syscalls that use nonstardard return conventions. */ - switch (reg0) { - case TARGET_SYS_WRITE: - case TARGET_SYS_READ: - reg0 = arm_semi_syscall_len - ret; - break; - case TARGET_SYS_SEEK: - reg0 = 0; - break; - default: - reg0 = ret; - break; - } - } - if (is_a64(env)) { - env->xregs[0] = reg0; - } else { - env->regs[0] = reg0; - } -} - -static target_ulong arm_flen_buf(ARMCPU *cpu) -{ - /* Return an address in target memory of 64 bytes where the remote - * gdb should write its stat struct. (The format of this structure - * is defined by GDB's remote protocol and is not target-specific.) - * We put this on the guest's stack just below SP. - */ - CPUARMState *env = &cpu->env; - target_ulong sp; - - if (is_a64(env)) { - sp = env->xregs[31]; - } else { - sp = env->regs[13]; - } - - return sp - 64; -} - -static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err) -{ - ARMCPU *cpu = ARM_CPU(cs); - CPUARMState *env = &cpu->env; - /* The size is always stored in big-endian order, extract - the value. We assume the size always fit in 32 bits. */ - uint32_t size; - cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0); - size = be32_to_cpu(size); - if (is_a64(env)) { - env->xregs[0] = size; - } else { - env->regs[0] = size; - } - errno = err; - set_swi_errno(env, -1); -} - -static int arm_semi_open_guestfd; - -static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err) -{ - ARMCPU *cpu = ARM_CPU(cs); - CPUARMState *env = &cpu->env; - if (ret == (target_ulong)-1) { - errno = err; - set_swi_errno(env, -1); - dealloc_guestfd(arm_semi_open_guestfd); - } else { - associate_guestfd(arm_semi_open_guestfd, ret); - ret = arm_semi_open_guestfd; - } - - if (is_a64(env)) { - env->xregs[0] = ret; - } else { - env->regs[0] = ret; - } -} - -static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb, - const char *fmt, ...) -{ - va_list va; - CPUARMState *env = &cpu->env; - - va_start(va, fmt); - gdb_do_syscallv(cb, fmt, va); - va_end(va); - - /* - * FIXME: in softmmu mode, the gdbstub will schedule our callback - * to occur, but will not actually call it to complete the syscall - * until after this function has returned and we are back in the - * CPU main loop. Therefore callers to this function must not - * do anything with its return value, because it is not necessarily - * the result of the syscall, but could just be the old value of X0. - * The only thing safe to do with this is that the callers of - * do_arm_semihosting() will write it straight back into X0. - * (In linux-user mode, the callback will have happened before - * gdb_do_syscallv() returns.) - * - * We should tidy this up so neither this function nor - * do_arm_semihosting() return a value, so the mistake of - * doing something with the return value is not possible to make. - */ - - return is_a64(env) ? env->xregs[0] : env->regs[0]; -} - -/* - * Types for functions implementing various semihosting calls - * for specific types of guest file descriptor. These must all - * do the work and return the required return value for the guest, - * setting the guest errno if appropriate. - */ -typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf); -typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len); -typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len); -typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf); -typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf, - target_ulong offset); -typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf); - -static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf) -{ - CPUARMState *env = &cpu->env; - - /* - * Only close the underlying host fd if it's one we opened on behalf - * of the guest in SYS_OPEN. - */ - if (gf->hostfd == STDIN_FILENO || - gf->hostfd == STDOUT_FILENO || - gf->hostfd == STDERR_FILENO) { - return 0; - } - return set_swi_errno(env, close(gf->hostfd)); -} - -static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - uint32_t ret; - CPUARMState *env = &cpu->env; - char *s = lock_user(VERIFY_READ, buf, len, 1); - if (!s) { - /* Return bytes not written on error */ - return len; - } - ret = set_swi_errno(env, write(gf->hostfd, s, len)); - unlock_user(s, buf, 0); - if (ret == (uint32_t)-1) { - ret = 0; - } - /* Return bytes not written */ - return len - ret; -} - -static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - uint32_t ret; - CPUARMState *env = &cpu->env; - char *s = lock_user(VERIFY_WRITE, buf, len, 0); - if (!s) { - /* return bytes not read */ - return len; - } - do { - ret = set_swi_errno(env, read(gf->hostfd, s, len)); - } while (ret == -1 && errno == EINTR); - unlock_user(s, buf, len); - if (ret == (uint32_t)-1) { - ret = 0; - } - /* Return bytes not read */ - return len - ret; -} - -static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf) -{ - return isatty(gf->hostfd); -} - -static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset) -{ - CPUARMState *env = &cpu->env; - uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET)); - if (ret == (uint32_t)-1) { - return -1; - } - return 0; -} - -static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf) -{ - CPUARMState *env = &cpu->env; - struct stat buf; - uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf)); - if (ret == (uint32_t)-1) { - return -1; - } - return buf.st_size; -} - -static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf) -{ - return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd); -} - -static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - arm_semi_syscall_len = len; - return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x", - gf->hostfd, buf, len); -} - -static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - arm_semi_syscall_len = len; - return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x", - gf->hostfd, buf, len); -} - -static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf) -{ - return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd); -} - -static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset) -{ - return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0", - gf->hostfd, offset); -} - -static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf) -{ - return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x", - gf->hostfd, arm_flen_buf(cpu)); -} - -#define SHFB_MAGIC_0 0x53 -#define SHFB_MAGIC_1 0x48 -#define SHFB_MAGIC_2 0x46 -#define SHFB_MAGIC_3 0x42 - -/* Feature bits reportable in feature byte 0 */ -#define SH_EXT_EXIT_EXTENDED (1 << 0) -#define SH_EXT_STDOUT_STDERR (1 << 1) - -static const uint8_t featurefile_data[] = { - SHFB_MAGIC_0, - SHFB_MAGIC_1, - SHFB_MAGIC_2, - SHFB_MAGIC_3, - SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */ -}; - -static void init_featurefile_guestfd(int guestfd) -{ - GuestFD *gf = do_get_guestfd(guestfd); - - assert(gf); - gf->type = GuestFDFeatureFile; - gf->featurefile_offset = 0; -} - -static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf) -{ - /* Nothing to do */ - return 0; -} - -static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - /* This fd can never be open for writing */ - CPUARMState *env = &cpu->env; - - errno = EBADF; - return set_swi_errno(env, -1); -} - -static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf, - target_ulong buf, uint32_t len) -{ - uint32_t i; -#ifndef CONFIG_USER_ONLY - CPUARMState *env = &cpu->env; -#endif - char *s; - - s = lock_user(VERIFY_WRITE, buf, len, 0); - if (!s) { - return len; - } - - for (i = 0; i < len; i++) { - if (gf->featurefile_offset >= sizeof(featurefile_data)) { - break; - } - s[i] = featurefile_data[gf->featurefile_offset]; - gf->featurefile_offset++; - } - - unlock_user(s, buf, len); - - /* Return number of bytes not read */ - return len - i; -} - -static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf) -{ - return 0; -} - -static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf, - target_ulong offset) -{ - gf->featurefile_offset = offset; - return 0; -} - -static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf) -{ - return sizeof(featurefile_data); -} - -typedef struct GuestFDFunctions { - sys_closefn *closefn; - sys_writefn *writefn; - sys_readfn *readfn; - sys_isattyfn *isattyfn; - sys_seekfn *seekfn; - sys_flenfn *flenfn; -} GuestFDFunctions; - -static const GuestFDFunctions guestfd_fns[] = { - [GuestFDHost] = { - .closefn = host_closefn, - .writefn = host_writefn, - .readfn = host_readfn, - .isattyfn = host_isattyfn, - .seekfn = host_seekfn, - .flenfn = host_flenfn, - }, - [GuestFDGDB] = { - .closefn = gdb_closefn, - .writefn = gdb_writefn, - .readfn = gdb_readfn, - .isattyfn = gdb_isattyfn, - .seekfn = gdb_seekfn, - .flenfn = gdb_flenfn, - }, - [GuestFDFeatureFile] = { - .closefn = featurefile_closefn, - .writefn = featurefile_writefn, - .readfn = featurefile_readfn, - .isattyfn = featurefile_isattyfn, - .seekfn = featurefile_seekfn, - .flenfn = featurefile_flenfn, - }, -}; - -/* Read the input value from the argument block; fail the semihosting - * call if the memory read fails. - */ -#define GET_ARG(n) do { \ - if (is_a64(env)) { \ - if (get_user_u64(arg ## n, args + (n) * 8)) { \ - errno = EFAULT; \ - return set_swi_errno(env, -1); \ - } \ - } else { \ - if (get_user_u32(arg ## n, args + (n) * 4)) { \ - errno = EFAULT; \ - return set_swi_errno(env, -1); \ - } \ - } \ -} while (0) - -#define SET_ARG(n, val) \ - (is_a64(env) ? \ - put_user_u64(val, args + (n) * 8) : \ - put_user_u32(val, args + (n) * 4)) - -/* - * Do a semihosting call. - * - * The specification always says that the "return register" either - * returns a specific value or is corrupted, so we don't need to - * report to our caller whether we are returning a value or trying to - * leave the register unchanged. We use 0xdeadbeef as the return value - * when there isn't a defined return value for the call. - */ -target_ulong do_arm_semihosting(CPUARMState *env) -{ - ARMCPU *cpu = env_archcpu(env); - CPUState *cs = env_cpu(env); - target_ulong args; - target_ulong arg0, arg1, arg2, arg3; - char * s; - int nr; - uint32_t ret; - uint32_t len; - GuestFD *gf; - - if (is_a64(env)) { - /* Note that the syscall number is in W0, not X0 */ - nr = env->xregs[0] & 0xffffffffU; - args = env->xregs[1]; - } else { - nr = env->regs[0]; - args = env->regs[1]; - } - - switch (nr) { - case TARGET_SYS_OPEN: - { - int guestfd; - - GET_ARG(0); - GET_ARG(1); - GET_ARG(2); - s = lock_user_string(arg0); - if (!s) { - errno = EFAULT; - return set_swi_errno(env, -1); - } - if (arg1 >= 12) { - unlock_user(s, arg0, 0); - errno = EINVAL; - return set_swi_errno(env, -1); - } - - guestfd = alloc_guestfd(); - if (guestfd < 0) { - unlock_user(s, arg0, 0); - errno = EMFILE; - return set_swi_errno(env, -1); - } - - if (strcmp(s, ":tt") == 0) { - int result_fileno; - - /* - * We implement SH_EXT_STDOUT_STDERR, so: - * open for read == stdin - * open for write == stdout - * open for append == stderr - */ - if (arg1 < 4) { - result_fileno = STDIN_FILENO; - } else if (arg1 < 8) { - result_fileno = STDOUT_FILENO; - } else { - result_fileno = STDERR_FILENO; - } - associate_guestfd(guestfd, result_fileno); - unlock_user(s, arg0, 0); - return guestfd; - } - if (strcmp(s, ":semihosting-features") == 0) { - unlock_user(s, arg0, 0); - /* We must fail opens for modes other than 0 ('r') or 1 ('rb') */ - if (arg1 != 0 && arg1 != 1) { - dealloc_guestfd(guestfd); - errno = EACCES; - return set_swi_errno(env, -1); - } - init_featurefile_guestfd(guestfd); - return guestfd; - } - - if (use_gdb_syscalls()) { - arm_semi_open_guestfd = guestfd; - ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0, - (int)arg2 + 1, gdb_open_modeflags[arg1]); - } else { - ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644)); - if (ret == (uint32_t)-1) { - dealloc_guestfd(guestfd); - } else { - associate_guestfd(guestfd, ret); - ret = guestfd; - } - } - unlock_user(s, arg0, 0); - return ret; - } - case TARGET_SYS_CLOSE: - GET_ARG(0); - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - ret = guestfd_fns[gf->type].closefn(cpu, gf); - dealloc_guestfd(arg0); - return ret; - case TARGET_SYS_WRITEC: - qemu_semihosting_console_outc(env, args); - return 0xdeadbeef; - case TARGET_SYS_WRITE0: - return qemu_semihosting_console_outs(env, args); - case TARGET_SYS_WRITE: - GET_ARG(0); - GET_ARG(1); - GET_ARG(2); - len = arg2; - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len); - case TARGET_SYS_READ: - GET_ARG(0); - GET_ARG(1); - GET_ARG(2); - len = arg2; - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len); - case TARGET_SYS_READC: - return qemu_semihosting_console_inc(env); - case TARGET_SYS_ISTTY: - GET_ARG(0); - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - return guestfd_fns[gf->type].isattyfn(cpu, gf); - case TARGET_SYS_SEEK: - GET_ARG(0); - GET_ARG(1); - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - return guestfd_fns[gf->type].seekfn(cpu, gf, arg1); - case TARGET_SYS_FLEN: - GET_ARG(0); - - gf = get_guestfd(arg0); - if (!gf) { - errno = EBADF; - return set_swi_errno(env, -1); - } - - return guestfd_fns[gf->type].flenfn(cpu, gf); - case TARGET_SYS_TMPNAM: - qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__); - return -1; - case TARGET_SYS_REMOVE: - GET_ARG(0); - GET_ARG(1); - if (use_gdb_syscalls()) { - ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s", - arg0, (int)arg1 + 1); - } else { - s = lock_user_string(arg0); - if (!s) { - errno = EFAULT; - return set_swi_errno(env, -1); - } - ret = set_swi_errno(env, remove(s)); - unlock_user(s, arg0, 0); - } - return ret; - case TARGET_SYS_RENAME: - GET_ARG(0); - GET_ARG(1); - GET_ARG(2); - GET_ARG(3); - if (use_gdb_syscalls()) { - return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s", - arg0, (int)arg1 + 1, arg2, (int)arg3 + 1); - } else { - char *s2; - s = lock_user_string(arg0); - s2 = lock_user_string(arg2); - if (!s || !s2) { - errno = EFAULT; - ret = set_swi_errno(env, -1); - } else { - ret = set_swi_errno(env, rename(s, s2)); - } - if (s2) - unlock_user(s2, arg2, 0); - if (s) - unlock_user(s, arg0, 0); - return ret; - } - case TARGET_SYS_CLOCK: - return clock() / (CLOCKS_PER_SEC / 100); - case TARGET_SYS_TIME: - return set_swi_errno(env, time(NULL)); - case TARGET_SYS_SYSTEM: - GET_ARG(0); - GET_ARG(1); - if (use_gdb_syscalls()) { - return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s", - arg0, (int)arg1 + 1); - } else { - s = lock_user_string(arg0); - if (!s) { - errno = EFAULT; - return set_swi_errno(env, -1); - } - ret = set_swi_errno(env, system(s)); - unlock_user(s, arg0, 0); - return ret; - } - case TARGET_SYS_ERRNO: - return get_swi_errno(env); - case TARGET_SYS_GET_CMDLINE: - { - /* Build a command-line from the original argv. - * - * The inputs are: - * * arg0, pointer to a buffer of at least the size - * specified in arg1. - * * arg1, size of the buffer pointed to by arg0 in - * bytes. - * - * The outputs are: - * * arg0, pointer to null-terminated string of the - * command line. - * * arg1, length of the string pointed to by arg0. - */ - - char *output_buffer; - size_t input_size; - size_t output_size; - int status = 0; -#if !defined(CONFIG_USER_ONLY) - const char *cmdline; -#else - TaskState *ts = cs->opaque; -#endif - GET_ARG(0); - GET_ARG(1); - input_size = arg1; - /* Compute the size of the output string. */ -#if !defined(CONFIG_USER_ONLY) - cmdline = semihosting_get_cmdline(); - if (cmdline == NULL) { - cmdline = ""; /* Default to an empty line. */ - } - output_size = strlen(cmdline) + 1; /* Count terminating 0. */ -#else - unsigned int i; - - output_size = ts->info->arg_end - ts->info->arg_start; - if (!output_size) { - /* - * We special-case the "empty command line" case (argc==0). - * Just provide the terminating 0. - */ - output_size = 1; - } -#endif - - if (output_size > input_size) { - /* Not enough space to store command-line arguments. */ - errno = E2BIG; - return set_swi_errno(env, -1); - } - - /* Adjust the command-line length. */ - if (SET_ARG(1, output_size - 1)) { - /* Couldn't write back to argument block */ - errno = EFAULT; - return set_swi_errno(env, -1); - } - - /* Lock the buffer on the ARM side. */ - output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0); - if (!output_buffer) { - errno = EFAULT; - return set_swi_errno(env, -1); - } - - /* Copy the command-line arguments. */ -#if !defined(CONFIG_USER_ONLY) - pstrcpy(output_buffer, output_size, cmdline); -#else - if (output_size == 1) { - /* Empty command-line. */ - output_buffer[0] = '\0'; - goto out; - } - - if (copy_from_user(output_buffer, ts->info->arg_start, - output_size)) { - errno = EFAULT; - status = set_swi_errno(env, -1); - goto out; - } - - /* Separate arguments by white spaces. */ - for (i = 0; i < output_size - 1; i++) { - if (output_buffer[i] == 0) { - output_buffer[i] = ' '; - } - } - out: -#endif - /* Unlock the buffer on the ARM side. */ - unlock_user(output_buffer, arg0, output_size); - - return status; - } - case TARGET_SYS_HEAPINFO: - { - target_ulong retvals[4]; - target_ulong limit; - int i; -#ifdef CONFIG_USER_ONLY - TaskState *ts = cs->opaque; -#else - const struct arm_boot_info *info = env->boot_info; - target_ulong rambase = info->loader_start; -#endif - - GET_ARG(0); - -#ifdef CONFIG_USER_ONLY - /* - * Some C libraries assume the heap immediately follows .bss, so - * allocate it using sbrk. - */ - if (!ts->heap_limit) { - abi_ulong ret; - - ts->heap_base = do_brk(0); - limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; - /* Try a big heap, and reduce the size if that fails. */ - for (;;) { - ret = do_brk(limit); - if (ret >= limit) { - break; - } - limit = (ts->heap_base >> 1) + (limit >> 1); - } - ts->heap_limit = limit; - } - - retvals[0] = ts->heap_base; - retvals[1] = ts->heap_limit; - retvals[2] = ts->stack_base; - retvals[3] = 0; /* Stack limit. */ -#else - limit = current_machine->ram_size; - /* TODO: Make this use the limit of the loaded application. */ - retvals[0] = rambase + limit / 2; - retvals[1] = rambase + limit; - retvals[2] = rambase + limit; /* Stack base */ - retvals[3] = rambase; /* Stack limit. */ -#endif - - for (i = 0; i < ARRAY_SIZE(retvals); i++) { - bool fail; - - if (is_a64(env)) { - fail = put_user_u64(retvals[i], arg0 + i * 8); - } else { - fail = put_user_u32(retvals[i], arg0 + i * 4); - } - - if (fail) { - /* Couldn't write back to argument block */ - errno = EFAULT; - return set_swi_errno(env, -1); - } - } - return 0; - } - case TARGET_SYS_EXIT: - case TARGET_SYS_EXIT_EXTENDED: - if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) { - /* - * The A64 version of SYS_EXIT takes a parameter block, - * so the application-exit type can return a subcode which - * is the exit status code from the application. - * SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function - * which allows A32/T32 guests to also provide a status code. - */ - GET_ARG(0); - GET_ARG(1); - - if (arg0 == ADP_Stopped_ApplicationExit) { - ret = arg1; - } else { - ret = 1; - } - } else { - /* - * The A32/T32 version of SYS_EXIT specifies only - * Stopped_ApplicationExit as normal exit, but does not - * allow the guest to specify the exit status code. - * Everything else is considered an error. - */ - ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1; - } - gdb_exit(ret); - exit(ret); - case TARGET_SYS_SYNCCACHE: - /* - * Clean the D-cache and invalidate the I-cache for the specified - * virtual address range. This is a nop for us since we don't - * implement caches. This is only present on A64. - */ - if (is_a64(env)) { - return 0; - } - /* fall through -- invalid for A32/T32 */ - default: - fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr); - cpu_dump_state(cs, stderr, 0); - abort(); - } -} diff --git a/target/arm/meson.build b/target/arm/meson.build index f5de2a77b8..15b936c101 100644 --- a/target/arm/meson.build +++ b/target/arm/meson.build @@ -32,8 +32,6 @@ arm_ss.add(files( )) arm_ss.add(zlib) -arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c')) - arm_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c', 'kvm64.c'), if_false: files('kvm-stub.c')) arm_ss.add(when: 'TARGET_AARCH64', if_true: files( -- cgit v1.2.3