Merge remote-tracking branch 'remotes/stsquad/tags/pull-testing-and-misc-180121-2' into staging

Testing, gdbstub and semihosting patches:

  - clean-ups to docker images
  - drop duplicate jobs from shippable
  - prettier tag generation (+gtags)
  - generate browsable source tree
  - more Travis->GitLab migrations
  - fix checkpatch to deal with commits
  - gate gdbstub tests on 8.3.1, expand tests
  - support Xfer:auxv:read gdb packet
  - better gdbstub cleanup
  - use GDB's SVE register layout
  - make arm-compat-semihosting common
  - add riscv semihosting support
  - add HEAPINFO, ELAPSED, TICKFREQ, TMPNAM and ISERROR to semihosting

# gpg: Signature made Mon 18 Jan 2021 10:09:11 GMT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-testing-and-misc-180121-2: (30 commits)
  semihosting: Implement SYS_ISERROR
  semihosting: Implement SYS_TMPNAM
  semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ
  riscv: Add semihosting support for user mode
  riscv: Add semihosting support
  semihosting: Support SYS_HEAPINFO when env->boot_info is not set
  semihosting: Change internal common-semi interfaces to use CPUState *
  semihosting: Change common-semi API to be architecture-independent
  semihosting: Move ARM semihosting code to shared directories
  target/arm: use official org.gnu.gdb.aarch64.sve layout for registers
  gdbstub: ensure we clean-up when terminated
  gdbstub: drop gdbserver_cleanup in favour of gdb_exit
  gdbstub: drop CPUEnv from gdb_exit()
  gdbstub: add support to Xfer:auxv:read: packet
  gdbstub: implement a softmmu based test
  Revert "tests/tcg/multiarch/Makefile.target: Disable run-gdbstub-sha1 test"
  configure: gate our use of GDB to 8.3.1 or above
  test/guest-debug: echo QEMU command as well
  scripts/checkpatch.pl: fix git-show invocation to include diffstat
  gitlab: migrate the minimal tools and unit tests from Travis
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

# Conflicts:
#	default-configs/targets/riscv32-linux-user.mak
#	default-configs/targets/riscv64-linux-user.mak

12 files changed, 99 insertions, 1184 deletions

diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c
deleted file mode 100644
index f7b7bff522..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 <http://www.gnu.org/licenses/>.
- *
- *  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(env, 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/cpu.h b/target/arm/cpu.h
index f3bca73d98..84cc2de3b1 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1068,14 +1068,6 @@ static inline void aarch64_sve_change_el(CPUARMState *env, int o,
 static inline void aarch64_add_sve_properties(Object *obj) { }
 #endif
 
-#if !defined(CONFIG_TCG)
-static inline target_ulong do_arm_semihosting(CPUARMState *env)
-{
-    g_assert_not_reached();
-}
-#else
-target_ulong do_arm_semihosting(CPUARMState *env);
-#endif
 void aarch64_sync_32_to_64(CPUARMState *env);
 void aarch64_sync_64_to_32(CPUARMState *env);
 
diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c
index 866595b4f1..a8fff2a3d0 100644
--- a/target/arm/gdbstub.c
+++ b/target/arm/gdbstub.c
@@ -195,22 +195,17 @@ static const struct TypeSize vec_lanes[] = {
     { "uint128", 128, 'q', 'u' },
     { "int128", 128, 'q', 's' },
     /* 64 bit */
+    { "ieee_double", 64, 'd', 'f' },
     { "uint64", 64, 'd', 'u' },
     { "int64", 64, 'd', 's' },
-    { "ieee_double", 64, 'd', 'f' },
     /* 32 bit */
+    { "ieee_single", 32, 's', 'f' },
     { "uint32", 32, 's', 'u' },
     { "int32", 32, 's', 's' },
-    { "ieee_single", 32, 's', 'f' },
     /* 16 bit */
+    { "ieee_half", 16, 'h', 'f' },
     { "uint16", 16, 'h', 'u' },
     { "int16", 16, 'h', 's' },
-    /*
-     * TODO: currently there is no reliable way of telling
-     * if the remote gdb actually understands ieee_half so
-     * we don't expose it in the target description for now.
-     * { "ieee_half", 16, 'h', 'f' },
-     */
     /* bytes */
     { "uint8", 8, 'b', 'u' },
     { "int8", 8, 'b', 's' },
@@ -223,17 +218,16 @@ int arm_gen_dynamic_svereg_xml(CPUState *cs, int base_reg)
     GString *s = g_string_new(NULL);
     DynamicGDBXMLInfo *info = &cpu->dyn_svereg_xml;
     g_autoptr(GString) ts = g_string_new("");
-    int i, bits, reg_width = (cpu->sve_max_vq * 128);
+    int i, j, bits, reg_width = (cpu->sve_max_vq * 128);
     info->num = 0;
     g_string_printf(s, "<?xml version=\"1.0\"?>");
     g_string_append_printf(s, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
-    g_string_append_printf(s, "<feature name=\"org.qemu.gdb.aarch64.sve\">");
+    g_string_append_printf(s, "<feature name=\"org.gnu.gdb.aarch64.sve\">");
 
     /* First define types and totals in a whole VL */
     for (i = 0; i < ARRAY_SIZE(vec_lanes); i++) {
         int count = reg_width / vec_lanes[i].size;
-        g_string_printf(ts, "vq%d%c%c", count,
-                        vec_lanes[i].sz, vec_lanes[i].suffix);
+        g_string_printf(ts, "svev%c%c", vec_lanes[i].sz, vec_lanes[i].suffix);
         g_string_append_printf(s,
                                "<vector id=\"%s\" type=\"%s\" count=\"%d\"/>",
                                ts->str, vec_lanes[i].gdb_type, count);
@@ -243,39 +237,37 @@ int arm_gen_dynamic_svereg_xml(CPUState *cs, int base_reg)
      * signed and potentially float versions of each size from 128 to
      * 8 bits.
      */
-    for (bits = 128; bits >= 8; bits /= 2) {
-        int count = reg_width / bits;
-        g_string_append_printf(s, "<union id=\"vq%dn\">", count);
-        for (i = 0; i < ARRAY_SIZE(vec_lanes); i++) {
-            if (vec_lanes[i].size == bits) {
-                g_string_append_printf(s, "<field name=\"%c\" type=\"vq%d%c%c\"/>",
-                                       vec_lanes[i].suffix,
-                                       count,
-                                       vec_lanes[i].sz, vec_lanes[i].suffix);
+    for (bits = 128, i = 0; bits >= 8; bits /= 2, i++) {
+        const char suf[] = { 'q', 'd', 's', 'h', 'b' };
+        g_string_append_printf(s, "<union id=\"svevn%c\">", suf[i]);
+        for (j = 0; j < ARRAY_SIZE(vec_lanes); j++) {
+            if (vec_lanes[j].size == bits) {
+                g_string_append_printf(s, "<field name=\"%c\" type=\"svev%c%c\"/>",
+                                       vec_lanes[j].suffix,
+                                       vec_lanes[j].sz, vec_lanes[j].suffix);
             }
         }
         g_string_append(s, "</union>");
     }
     /* And now the final union of unions */
-    g_string_append(s, "<union id=\"vq\">");
-    for (bits = 128; bits >= 8; bits /= 2) {
-        int count = reg_width / bits;
-        for (i = 0; i < ARRAY_SIZE(vec_lanes); i++) {
-            if (vec_lanes[i].size == bits) {
-                g_string_append_printf(s, "<field name=\"%c\" type=\"vq%dn\"/>",
-                                       vec_lanes[i].sz, count);
-                break;
-            }
-        }
+    g_string_append(s, "<union id=\"svev\">");
+    for (bits = 128, i = 0; bits >= 8; bits /= 2, i++) {
+        const char suf[] = { 'q', 'd', 's', 'h', 'b' };
+        g_string_append_printf(s, "<field name=\"%c\" type=\"svevn%c\"/>",
+                               suf[i], suf[i]);
     }
     g_string_append(s, "</union>");
 
+    /* Finally the sve prefix type */
+    g_string_append_printf(s,
+                           "<vector id=\"svep\" type=\"uint8\" count=\"%d\"/>",
+                           reg_width / 8);
+
     /* Then define each register in parts for each vq */
     for (i = 0; i < 32; i++) {
         g_string_append_printf(s,
                                "<reg name=\"z%d\" bitsize=\"%d\""
-                               " regnum=\"%d\" group=\"vector\""
-                               " type=\"vq\"/>",
+                               " regnum=\"%d\" type=\"svev\"/>",
                                i, reg_width, base_reg++);
         info->num++;
     }
@@ -287,31 +279,22 @@ int arm_gen_dynamic_svereg_xml(CPUState *cs, int base_reg)
                            " regnum=\"%d\" group=\"float\""
                            " type=\"int\"/>", base_reg++);
     info->num += 2;
-    /*
-     * Predicate registers aren't so big they are worth splitting up
-     * but we do need to define a type to hold the array of quad
-     * references.
-     */
-    g_string_append_printf(s,
-                           "<vector id=\"vqp\" type=\"uint16\" count=\"%d\"/>",
-                           cpu->sve_max_vq);
+
     for (i = 0; i < 16; i++) {
         g_string_append_printf(s,
                                "<reg name=\"p%d\" bitsize=\"%d\""
-                               " regnum=\"%d\" group=\"vector\""
-                               " type=\"vqp\"/>",
+                               " regnum=\"%d\" type=\"svep\"/>",
                                i, cpu->sve_max_vq * 16, base_reg++);
         info->num++;
     }
     g_string_append_printf(s,
                            "<reg name=\"ffr\" bitsize=\"%d\""
                            " regnum=\"%d\" group=\"vector\""
-                           " type=\"vqp\"/>",
+                           " type=\"svep\"/>",
                            cpu->sve_max_vq * 16, base_reg++);
     g_string_append_printf(s,
                            "<reg name=\"vg\" bitsize=\"64\""
-                           " regnum=\"%d\" group=\"vector\""
-                           " type=\"uint32\"/>",
+                           " regnum=\"%d\" type=\"int\"/>",
                            base_reg++);
     info->num += 2;
     g_string_append_printf(s, "</feature>");
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 5ab3f5ace3..c5377e7ecb 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -34,6 +34,7 @@
 #ifdef CONFIG_TCG
 #include "arm_ldst.h"
 #include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
 #endif
 
 #define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
@@ -276,7 +277,7 @@ static int arm_gdb_get_svereg(CPUARMState *env, GByteArray *buf, int reg)
          * while the ZCR works in Vector Quads (VQ) which is 128bit chunks.
          */
         int vq = sve_zcr_len_for_el(env, arm_current_el(env)) + 1;
-        return gdb_get_reg32(buf, vq * 2);
+        return gdb_get_reg64(buf, vq * 2);
     }
     default:
         /* gdbstub asked for something out our range */
@@ -9875,13 +9876,13 @@ static void handle_semihosting(CPUState *cs)
         qemu_log_mask(CPU_LOG_INT,
                       "...handling as semihosting call 0x%" PRIx64 "\n",
                       env->xregs[0]);
-        env->xregs[0] = do_arm_semihosting(env);
+        env->xregs[0] = do_common_semihosting(cs);
         env->pc += 4;
     } else {
         qemu_log_mask(CPU_LOG_INT,
                       "...handling as semihosting call 0x%x\n",
                       env->regs[0]);
-        env->regs[0] = do_arm_semihosting(env);
+        env->regs[0] = do_common_semihosting(cs);
         env->regs[15] += env->thumb ? 2 : 4;
     }
 }
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index 643dcafb83..6176003029 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -31,6 +31,7 @@
 #ifdef CONFIG_TCG
 #include "arm_ldst.h"
 #include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
 #endif
 
 static void v7m_msr_xpsr(CPUARMState *env, uint32_t mask,
@@ -2306,7 +2307,11 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
         qemu_log_mask(CPU_LOG_INT,
                       "...handling as semihosting call 0x%x\n",
                       env->regs[0]);
-        env->regs[0] = do_arm_semihosting(env);
+#ifdef CONFIG_TCG
+        env->regs[0] = do_common_semihosting(cs);
+#else
+        g_assert_not_reached();
+#endif
         env->regs[15] += env->thumb ? 2 : 4;
         return;
     case EXCP_BKPT:
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(
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 27600e0cc0..d919245e4f 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -195,7 +195,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
     args = env->dregs[1];
     switch (nr) {
     case HOSTED_EXIT:
-        gdb_exit(env, env->dregs[0]);
+        gdb_exit(env->dregs[0]);
         exit(env->dregs[0]);
     case HOSTED_OPEN:
         GET_ARG(0);
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index d7a80dd303..e508b2fafc 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -215,7 +215,7 @@ void do_nios2_semihosting(CPUNios2State *env)
     args = env->regs[R_ARG1];
     switch (nr) {
     case HOSTED_EXIT:
-        gdb_exit(env, env->regs[R_ARG0]);
+        gdb_exit(env->regs[R_ARG0]);
         exit(env->regs[R_ARG0]);
     case HOSTED_OPEN:
         GET_ARG(0);
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index b41e8836c3..4196ef8b69 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -542,6 +542,7 @@
 #define RISCV_EXCP_INST_PAGE_FAULT               0xc /* since: priv-1.10.0 */
 #define RISCV_EXCP_LOAD_PAGE_FAULT               0xd /* since: priv-1.10.0 */
 #define RISCV_EXCP_STORE_PAGE_FAULT              0xf /* since: priv-1.10.0 */
+#define RISCV_EXCP_SEMIHOST                      0x10
 #define RISCV_EXCP_INST_GUEST_PAGE_FAULT         0x14
 #define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT       0x15
 #define RISCV_EXCP_VIRT_INSTRUCTION_FAULT        0x16
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index a2afb95fa1..f8350f5f78 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -24,6 +24,7 @@
 #include "exec/exec-all.h"
 #include "tcg/tcg-op.h"
 #include "trace.h"
+#include "hw/semihosting/common-semi.h"
 
 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
 {
@@ -847,6 +848,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
     target_ulong htval = 0;
     target_ulong mtval2 = 0;
 
+    if  (cause == RISCV_EXCP_SEMIHOST) {
+        if (env->priv >= PRV_S) {
+            env->gpr[xA0] = do_common_semihosting(cs);
+            env->pc += 4;
+            return;
+        }
+        cause = RISCV_EXCP_BREAKPOINT;
+    }
+
     if (!async) {
         /* set tval to badaddr for traps with address information */
         switch (cause) {
diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 2a61a853bf..32312be202 100644
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
 
 static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
 {
-    generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+    target_ulong    ebreak_addr = ctx->base.pc_next;
+    target_ulong    pre_addr = ebreak_addr - 4;
+    target_ulong    post_addr = ebreak_addr + 4;
+    uint32_t pre    = 0;
+    uint32_t ebreak = 0;
+    uint32_t post   = 0;
+
+    /*
+     * The RISC-V semihosting spec specifies the following
+     * three-instruction sequence to flag a semihosting call:
+     *
+     *      slli zero, zero, 0x1f       0x01f01013
+     *      ebreak                      0x00100073
+     *      srai zero, zero, 0x7        0x40705013
+     *
+     * The two shift operations on the zero register are no-ops, used
+     * here to signify a semihosting exception, rather than a breakpoint.
+     *
+     * Uncompressed instructions are required so that the sequence is easy
+     * to validate.
+     *
+     * The three instructions are required to lie in the same page so
+     * that no exception will be raised when fetching them.
+     */
+
+    if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
+        pre    = opcode_at(&ctx->base, pre_addr);
+        ebreak = opcode_at(&ctx->base, ebreak_addr);
+        post   = opcode_at(&ctx->base, post_addr);
+    }
+
+    if  (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
+        generate_exception(ctx, RISCV_EXCP_SEMIHOST);
+    } else {
+        generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+    }
     exit_tb(ctx); /* no chaining */
     ctx->base.is_jmp = DISAS_NORETURN;
     return true;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 554d52a4be..0f28b5f41e 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -64,6 +64,7 @@ typedef struct DisasContext {
     uint16_t vlen;
     uint16_t mlen;
     bool vl_eq_vlmax;
+    CPUState *cs;
 } DisasContext;
 
 #ifdef TARGET_RISCV64
@@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
     return true;
 }
 
+static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
+{
+    DisasContext *ctx = container_of(dcbase, DisasContext, base);
+    CPUState *cpu = ctx->cs;
+    CPURISCVState *env = cpu->env_ptr;
+
+    return cpu_ldl_code(env, pc);
+}
+
 /* Include insn module translation function */
 #include "insn_trans/trans_rvi.c.inc"
 #include "insn_trans/trans_rvm.c.inc"
@@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
     ctx->mlen = 1 << (ctx->sew  + 3 - ctx->lmul);
     ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+    ctx->cs = cs;
 }
 
 static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)