diff options
Diffstat (limited to 'accel/tcg/user-exec.c')
| -rw-r--r-- | accel/tcg/user-exec.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c new file mode 100644 index 0000000000..2a975eaf69 --- /dev/null +++ b/accel/tcg/user-exec.c @@ -0,0 +1,575 @@ +/* + * User emulator execution + * + * Copyright (c) 2003-2005 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ +#include "qemu/osdep.h" +#include "cpu.h" +#include "disas/disas.h" +#include "exec/exec-all.h" +#include "tcg.h" +#include "qemu/bitops.h" +#include "exec/cpu_ldst.h" +#include "translate-all.h" + +#undef EAX +#undef ECX +#undef EDX +#undef EBX +#undef ESP +#undef EBP +#undef ESI +#undef EDI +#undef EIP +#ifdef __linux__ +#include <sys/ucontext.h> +#endif + +//#define DEBUG_SIGNAL + +/* exit the current TB from a signal handler. The host registers are + restored in a state compatible with the CPU emulator + */ +static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set) +{ + /* XXX: use siglongjmp ? */ + sigprocmask(SIG_SETMASK, old_set, NULL); + cpu_loop_exit_noexc(cpu); +} + +/* 'pc' is the host PC at which the exception was raised. 'address' is + the effective address of the memory exception. 'is_write' is 1 if a + write caused the exception and otherwise 0'. 'old_set' is the + signal set which should be restored */ +static inline int handle_cpu_signal(uintptr_t pc, unsigned long address, + int is_write, sigset_t *old_set) +{ + CPUState *cpu = current_cpu; + CPUClass *cc; + int ret; + + /* For synchronous signals we expect to be coming from the vCPU + * thread (so current_cpu should be valid) and either from running + * code or during translation which can fault as we cross pages. + * + * If neither is true then something has gone wrong and we should + * abort rather than try and restart the vCPU execution. + */ + if (!cpu || !cpu->running) { + printf("qemu:%s received signal outside vCPU context @ pc=0x%" + PRIxPTR "\n", __func__, pc); + abort(); + } + +#if defined(DEBUG_SIGNAL) + printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n", + pc, address, is_write, *(unsigned long *)old_set); +#endif + /* XXX: locking issue */ + if (is_write && h2g_valid(address)) { + switch (page_unprotect(h2g(address), pc)) { + case 0: + /* Fault not caused by a page marked unwritable to protect + * cached translations, must be the guest binary's problem + */ + break; + case 1: + /* Fault caused by protection of cached translation; TBs + * invalidated, so resume execution + */ + return 1; + case 2: + /* Fault caused by protection of cached translation, and the + * currently executing TB was modified and must be exited + * immediately. + */ + cpu_exit_tb_from_sighandler(cpu, old_set); + g_assert_not_reached(); + default: + g_assert_not_reached(); + } + } + + /* Convert forcefully to guest address space, invalid addresses + are still valid segv ones */ + address = h2g_nocheck(address); + + cc = CPU_GET_CLASS(cpu); + /* see if it is an MMU fault */ + g_assert(cc->handle_mmu_fault); + ret = cc->handle_mmu_fault(cpu, address, is_write, MMU_USER_IDX); + if (ret < 0) { + return 0; /* not an MMU fault */ + } + if (ret == 0) { + return 1; /* the MMU fault was handled without causing real CPU fault */ + } + + /* Now we have a real cpu fault. Since this is the exact location of + * the exception, we must undo the adjustment done by cpu_restore_state + * for handling call return addresses. */ + cpu_restore_state(cpu, pc + GETPC_ADJ); + + sigprocmask(SIG_SETMASK, old_set, NULL); + cpu_loop_exit(cpu); + + /* never comes here */ + return 1; +} + +#if defined(__i386__) + +#if defined(__NetBSD__) +#include <ucontext.h> + +#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP]) +#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO]) +#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR]) +#define MASK_sig(context) ((context)->uc_sigmask) +#elif defined(__FreeBSD__) || defined(__DragonFly__) +#include <ucontext.h> + +#define EIP_sig(context) (*((unsigned long *)&(context)->uc_mcontext.mc_eip)) +#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno) +#define ERROR_sig(context) ((context)->uc_mcontext.mc_err) +#define MASK_sig(context) ((context)->uc_sigmask) +#elif defined(__OpenBSD__) +#define EIP_sig(context) ((context)->sc_eip) +#define TRAP_sig(context) ((context)->sc_trapno) +#define ERROR_sig(context) ((context)->sc_err) +#define MASK_sig(context) ((context)->sc_mask) +#else +#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP]) +#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO]) +#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR]) +#define MASK_sig(context) ((context)->uc_sigmask) +#endif + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; +#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) + ucontext_t *uc = puc; +#elif defined(__OpenBSD__) + struct sigcontext *uc = puc; +#else + ucontext_t *uc = puc; +#endif + unsigned long pc; + int trapno; + +#ifndef REG_EIP +/* for glibc 2.1 */ +#define REG_EIP EIP +#define REG_ERR ERR +#define REG_TRAPNO TRAPNO +#endif + pc = EIP_sig(uc); + trapno = TRAP_sig(uc); + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + trapno == 0xe ? + (ERROR_sig(uc) >> 1) & 1 : 0, + &MASK_sig(uc)); +} + +#elif defined(__x86_64__) + +#ifdef __NetBSD__ +#define PC_sig(context) _UC_MACHINE_PC(context) +#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO]) +#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR]) +#define MASK_sig(context) ((context)->uc_sigmask) +#elif defined(__OpenBSD__) +#define PC_sig(context) ((context)->sc_rip) +#define TRAP_sig(context) ((context)->sc_trapno) +#define ERROR_sig(context) ((context)->sc_err) +#define MASK_sig(context) ((context)->sc_mask) +#elif defined(__FreeBSD__) || defined(__DragonFly__) +#include <ucontext.h> + +#define PC_sig(context) (*((unsigned long *)&(context)->uc_mcontext.mc_rip)) +#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno) +#define ERROR_sig(context) ((context)->uc_mcontext.mc_err) +#define MASK_sig(context) ((context)->uc_sigmask) +#else +#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP]) +#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO]) +#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR]) +#define MASK_sig(context) ((context)->uc_sigmask) +#endif + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + unsigned long pc; +#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) + ucontext_t *uc = puc; +#elif defined(__OpenBSD__) + struct sigcontext *uc = puc; +#else + ucontext_t *uc = puc; +#endif + + pc = PC_sig(uc); + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + TRAP_sig(uc) == 0xe ? + (ERROR_sig(uc) >> 1) & 1 : 0, + &MASK_sig(uc)); +} + +#elif defined(_ARCH_PPC) + +/*********************************************************************** + * signal context platform-specific definitions + * From Wine + */ +#ifdef linux +/* All Registers access - only for local access */ +#define REG_sig(reg_name, context) \ + ((context)->uc_mcontext.regs->reg_name) +/* Gpr Registers access */ +#define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context) +/* Program counter */ +#define IAR_sig(context) REG_sig(nip, context) +/* Machine State Register (Supervisor) */ +#define MSR_sig(context) REG_sig(msr, context) +/* Count register */ +#define CTR_sig(context) REG_sig(ctr, context) +/* User's integer exception register */ +#define XER_sig(context) REG_sig(xer, context) +/* Link register */ +#define LR_sig(context) REG_sig(link, context) +/* Condition register */ +#define CR_sig(context) REG_sig(ccr, context) + +/* Float Registers access */ +#define FLOAT_sig(reg_num, context) \ + (((double *)((char *)((context)->uc_mcontext.regs + 48 * 4)))[reg_num]) +#define FPSCR_sig(context) \ + (*(int *)((char *)((context)->uc_mcontext.regs + (48 + 32 * 2) * 4))) +/* Exception Registers access */ +#define DAR_sig(context) REG_sig(dar, context) +#define DSISR_sig(context) REG_sig(dsisr, context) +#define TRAP_sig(context) REG_sig(trap, context) +#endif /* linux */ + +#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) +#include <ucontext.h> +#define IAR_sig(context) ((context)->uc_mcontext.mc_srr0) +#define MSR_sig(context) ((context)->uc_mcontext.mc_srr1) +#define CTR_sig(context) ((context)->uc_mcontext.mc_ctr) +#define XER_sig(context) ((context)->uc_mcontext.mc_xer) +#define LR_sig(context) ((context)->uc_mcontext.mc_lr) +#define CR_sig(context) ((context)->uc_mcontext.mc_cr) +/* Exception Registers access */ +#define DAR_sig(context) ((context)->uc_mcontext.mc_dar) +#define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr) +#define TRAP_sig(context) ((context)->uc_mcontext.mc_exc) +#endif /* __FreeBSD__|| __FreeBSD_kernel__ */ + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; +#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) + ucontext_t *uc = puc; +#else + ucontext_t *uc = puc; +#endif + unsigned long pc; + int is_write; + + pc = IAR_sig(uc); + is_write = 0; +#if 0 + /* ppc 4xx case */ + if (DSISR_sig(uc) & 0x00800000) { + is_write = 1; + } +#else + if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) { + is_write = 1; + } +#endif + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, &uc->uc_sigmask); +} + +#elif defined(__alpha__) + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + uint32_t *pc = uc->uc_mcontext.sc_pc; + uint32_t insn = *pc; + int is_write = 0; + + /* XXX: need kernel patch to get write flag faster */ + switch (insn >> 26) { + case 0x0d: /* stw */ + case 0x0e: /* stb */ + case 0x0f: /* stq_u */ + case 0x24: /* stf */ + case 0x25: /* stg */ + case 0x26: /* sts */ + case 0x27: /* stt */ + case 0x2c: /* stl */ + case 0x2d: /* stq */ + case 0x2e: /* stl_c */ + case 0x2f: /* stq_c */ + is_write = 1; + } + + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, &uc->uc_sigmask); +} +#elif defined(__sparc__) + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + int is_write; + uint32_t insn; +#if !defined(__arch64__) || defined(CONFIG_SOLARIS) + uint32_t *regs = (uint32_t *)(info + 1); + void *sigmask = (regs + 20); + /* XXX: is there a standard glibc define ? */ + unsigned long pc = regs[1]; +#else +#ifdef __linux__ + struct sigcontext *sc = puc; + unsigned long pc = sc->sigc_regs.tpc; + void *sigmask = (void *)sc->sigc_mask; +#elif defined(__OpenBSD__) + struct sigcontext *uc = puc; + unsigned long pc = uc->sc_pc; + void *sigmask = (void *)(long)uc->sc_mask; +#elif defined(__NetBSD__) + ucontext_t *uc = puc; + unsigned long pc = _UC_MACHINE_PC(uc); + void *sigmask = (void *)&uc->uc_sigmask; +#endif +#endif + + /* XXX: need kernel patch to get write flag faster */ + is_write = 0; + insn = *(uint32_t *)pc; + if ((insn >> 30) == 3) { + switch ((insn >> 19) & 0x3f) { + case 0x05: /* stb */ + case 0x15: /* stba */ + case 0x06: /* sth */ + case 0x16: /* stha */ + case 0x04: /* st */ + case 0x14: /* sta */ + case 0x07: /* std */ + case 0x17: /* stda */ + case 0x0e: /* stx */ + case 0x1e: /* stxa */ + case 0x24: /* stf */ + case 0x34: /* stfa */ + case 0x27: /* stdf */ + case 0x37: /* stdfa */ + case 0x26: /* stqf */ + case 0x36: /* stqfa */ + case 0x25: /* stfsr */ + case 0x3c: /* casa */ + case 0x3e: /* casxa */ + is_write = 1; + break; + } + } + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, sigmask); +} + +#elif defined(__arm__) + +#if defined(__NetBSD__) +#include <ucontext.h> +#endif + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; +#if defined(__NetBSD__) + ucontext_t *uc = puc; +#else + ucontext_t *uc = puc; +#endif + unsigned long pc; + int is_write; + +#if defined(__NetBSD__) + pc = uc->uc_mcontext.__gregs[_REG_R15]; +#elif defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3)) + pc = uc->uc_mcontext.gregs[R15]; +#else + pc = uc->uc_mcontext.arm_pc; +#endif + + /* error_code is the FSR value, in which bit 11 is WnR (assuming a v6 or + * later processor; on v5 we will always report this as a read). + */ + is_write = extract32(uc->uc_mcontext.error_code, 11, 1); + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, + &uc->uc_sigmask); +} + +#elif defined(__aarch64__) + +int cpu_signal_handler(int host_signum, void *pinfo, void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + uintptr_t pc = uc->uc_mcontext.pc; + uint32_t insn = *(uint32_t *)pc; + bool is_write; + + /* XXX: need kernel patch to get write flag faster. */ + is_write = ( (insn & 0xbfff0000) == 0x0c000000 /* C3.3.1 */ + || (insn & 0xbfe00000) == 0x0c800000 /* C3.3.2 */ + || (insn & 0xbfdf0000) == 0x0d000000 /* C3.3.3 */ + || (insn & 0xbfc00000) == 0x0d800000 /* C3.3.4 */ + || (insn & 0x3f400000) == 0x08000000 /* C3.3.6 */ + || (insn & 0x3bc00000) == 0x39000000 /* C3.3.13 */ + || (insn & 0x3fc00000) == 0x3d800000 /* ... 128bit */ + /* Ingore bits 10, 11 & 21, controlling indexing. */ + || (insn & 0x3bc00000) == 0x38000000 /* C3.3.8-12 */ + || (insn & 0x3fe00000) == 0x3c800000 /* ... 128bit */ + /* Ignore bits 23 & 24, controlling indexing. */ + || (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */ + + return handle_cpu_signal(pc, (uintptr_t)info->si_addr, + is_write, &uc->uc_sigmask); +} + +#elif defined(__ia64) + +#ifndef __ISR_VALID + /* This ought to be in <bits/siginfo.h>... */ +# define __ISR_VALID 1 +#endif + +int cpu_signal_handler(int host_signum, void *pinfo, void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + unsigned long ip; + int is_write = 0; + + ip = uc->uc_mcontext.sc_ip; + switch (host_signum) { + case SIGILL: + case SIGFPE: + case SIGSEGV: + case SIGBUS: + case SIGTRAP: + if (info->si_code && (info->si_segvflags & __ISR_VALID)) { + /* ISR.W (write-access) is bit 33: */ + is_write = (info->si_isr >> 33) & 1; + } + break; + + default: + break; + } + return handle_cpu_signal(ip, (unsigned long)info->si_addr, + is_write, + (sigset_t *)&uc->uc_sigmask); +} + +#elif defined(__s390__) + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + unsigned long pc; + uint16_t *pinsn; + int is_write = 0; + + pc = uc->uc_mcontext.psw.addr; + + /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead + of the normal 2 arguments. The 3rd argument contains the "int_code" + from the hardware which does in fact contain the is_write value. + The rt signal handler, as far as I can tell, does not give this value + at all. Not that we could get to it from here even if it were. */ + /* ??? This is not even close to complete, since it ignores all + of the read-modify-write instructions. */ + pinsn = (uint16_t *)pc; + switch (pinsn[0] >> 8) { + case 0x50: /* ST */ + case 0x42: /* STC */ + case 0x40: /* STH */ + is_write = 1; + break; + case 0xc4: /* RIL format insns */ + switch (pinsn[0] & 0xf) { + case 0xf: /* STRL */ + case 0xb: /* STGRL */ + case 0x7: /* STHRL */ + is_write = 1; + } + break; + case 0xe3: /* RXY format insns */ + switch (pinsn[2] & 0xff) { + case 0x50: /* STY */ + case 0x24: /* STG */ + case 0x72: /* STCY */ + case 0x70: /* STHY */ + case 0x8e: /* STPQ */ + case 0x3f: /* STRVH */ + case 0x3e: /* STRV */ + case 0x2f: /* STRVG */ + is_write = 1; + } + break; + } + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, &uc->uc_sigmask); +} + +#elif defined(__mips__) + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + greg_t pc = uc->uc_mcontext.pc; + int is_write; + + /* XXX: compute is_write */ + is_write = 0; + return handle_cpu_signal(pc, (unsigned long)info->si_addr, + is_write, &uc->uc_sigmask); +} + +#else + +#error host CPU specific signal handler needed + +#endif |