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-rw-r--r--user-exec.c673
1 files changed, 673 insertions, 0 deletions
diff --git a/user-exec.c b/user-exec.c
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index 0000000000..d4a6abb8f5
--- /dev/null
+++ b/user-exec.c
@@ -0,0 +1,673 @@
+/*
+ * 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 "config.h"
+#include "exec.h"
+#include "disas.h"
+#include "tcg.h"
+
+#undef EAX
+#undef ECX
+#undef EDX
+#undef EBX
+#undef ESP
+#undef EBP
+#undef ESI
+#undef EDI
+#undef EIP
+#include <signal.h>
+#ifdef __linux__
+#include <sys/ucontext.h>
+#endif
+
+//#define DEBUG_SIGNAL
+
+#if defined(TARGET_I386)
+#define EXCEPTION_ACTION \
+ raise_exception_err(env->exception_index, env->error_code)
+#else
+#define EXCEPTION_ACTION \
+ cpu_loop_exit()
+#endif
+
+/* exit the current TB from a signal handler. The host registers are
+ restored in a state compatible with the CPU emulator
+ */
+void cpu_resume_from_signal(CPUState *env1, void *puc)
+{
+#ifdef __linux__
+ struct ucontext *uc = puc;
+#elif defined(__OpenBSD__)
+ struct sigcontext *uc = puc;
+#endif
+
+ env = env1;
+
+ /* XXX: restore cpu registers saved in host registers */
+
+ if (puc) {
+ /* XXX: use siglongjmp ? */
+#ifdef __linux__
+#ifdef __ia64
+ sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
+#else
+ sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
+#endif
+#elif defined(__OpenBSD__)
+ sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
+#endif
+ }
+ env->exception_index = -1;
+ longjmp(env->jmp_env, 1);
+}
+
+/* '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(unsigned long pc, unsigned long address,
+ int is_write, sigset_t *old_set,
+ void *puc)
+{
+ TranslationBlock *tb;
+ int ret;
+
+ if (cpu_single_env) {
+ env = cpu_single_env; /* XXX: find a correct solution for multithread */
+ }
+#if defined(DEBUG_SIGNAL)
+ qemu_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 && page_unprotect(h2g(address), pc, puc)) {
+ return 1;
+ }
+
+ /* see if it is an MMU fault */
+ ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
+ 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 */
+ tb = tb_find_pc(pc);
+ if (tb) {
+ /* the PC is inside the translated code. It means that we have
+ a virtual CPU fault */
+ cpu_restore_state(tb, env, pc);
+ }
+
+ /* we restore the process signal mask as the sigreturn should
+ do it (XXX: use sigsetjmp) */
+ sigprocmask(SIG_SETMASK, old_set, NULL);
+ EXCEPTION_ACTION;
+
+ /* never comes here */
+ return 1;
+}
+
+#if defined(__i386__)
+
+#if defined(__APPLE__)
+#include <sys/ucontext.h>
+
+#define EIP_sig(context) (*((unsigned long *)&(context)->uc_mcontext->ss.eip))
+#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
+#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
+#define MASK_sig(context) ((context)->uc_sigmask)
+#elif 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
+ struct ucontext *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), puc);
+}
+
+#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
+ struct ucontext *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), puc);
+}
+
+#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__ */
+
+#ifdef __APPLE__
+#include <sys/ucontext.h>
+typedef struct ucontext SIGCONTEXT;
+/* All Registers access - only for local access */
+#define REG_sig(reg_name, context) \
+ ((context)->uc_mcontext->ss.reg_name)
+#define FLOATREG_sig(reg_name, context) \
+ ((context)->uc_mcontext->fs.reg_name)
+#define EXCEPREG_sig(reg_name, context) \
+ ((context)->uc_mcontext->es.reg_name)
+#define VECREG_sig(reg_name, context) \
+ ((context)->uc_mcontext->vs.reg_name)
+/* Gpr Registers access */
+#define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
+/* Program counter */
+#define IAR_sig(context) REG_sig(srr0, context)
+/* Machine State Register (Supervisor) */
+#define MSR_sig(context) REG_sig(srr1, context)
+#define CTR_sig(context) REG_sig(ctr, context)
+/* Link register */
+#define XER_sig(context) REG_sig(xer, context)
+/* User's integer exception register */
+#define LR_sig(context) REG_sig(lr, context)
+/* Condition register */
+#define CR_sig(context) REG_sig(cr, context)
+/* Float Registers access */
+#define FLOAT_sig(reg_num, context) \
+ FLOATREG_sig(fpregs[reg_num], context)
+#define FPSCR_sig(context) \
+ ((double)FLOATREG_sig(fpscr, context))
+/* Exception Registers access */
+/* Fault registers for coredump */
+#define DAR_sig(context) EXCEPREG_sig(dar, context)
+#define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
+/* number of powerpc exception taken */
+#define TRAP_sig(context) EXCEPREG_sig(exception, context)
+#endif /* __APPLE__ */
+
+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
+ struct ucontext *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, puc);
+}
+
+#elif defined(__alpha__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ siginfo_t *info = pinfo;
+ struct ucontext *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, puc);
+}
+#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;
+#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, NULL);
+}
+
+#elif defined(__arm__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ siginfo_t *info = pinfo;
+ struct ucontext *uc = puc;
+ unsigned long pc;
+ int is_write;
+
+#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+ pc = uc->uc_mcontext.gregs[R15];
+#else
+ pc = uc->uc_mcontext.arm_pc;
+#endif
+ /* XXX: compute is_write */
+ is_write = 0;
+ return handle_cpu_signal(pc, (unsigned long)info->si_addr,
+ is_write,
+ &uc->uc_sigmask, puc);
+}
+
+#elif defined(__mc68000)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ siginfo_t *info = pinfo;
+ struct ucontext *uc = puc;
+ unsigned long pc;
+ int is_write;
+
+ pc = uc->uc_mcontext.gregs[16];
+ /* XXX: compute is_write */
+ is_write = 0;
+ return handle_cpu_signal(pc, (unsigned long)info->si_addr,
+ is_write,
+ &uc->uc_sigmask, puc);
+}
+
+#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;
+ struct ucontext *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, puc);
+}
+
+#elif defined(__s390__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ siginfo_t *info = pinfo;
+ struct ucontext *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, puc);
+}
+
+#elif defined(__mips__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ siginfo_t *info = pinfo;
+ struct ucontext *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, puc);
+}
+
+#elif defined(__hppa__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+ void *puc)
+{
+ struct siginfo *info = pinfo;
+ struct ucontext *uc = puc;
+ unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
+ uint32_t insn = *(uint32_t *)pc;
+ int is_write = 0;
+
+ /* XXX: need kernel patch to get write flag faster. */
+ switch (insn >> 26) {
+ case 0x1a: /* STW */
+ case 0x19: /* STH */
+ case 0x18: /* STB */
+ case 0x1b: /* STWM */
+ is_write = 1;
+ break;
+
+ case 0x09: /* CSTWX, FSTWX, FSTWS */
+ case 0x0b: /* CSTDX, FSTDX, FSTDS */
+ /* Distinguish from coprocessor load ... */
+ is_write = (insn >> 9) & 1;
+ break;
+
+ case 0x03:
+ switch ((insn >> 6) & 15) {
+ case 0xa: /* STWS */
+ case 0x9: /* STHS */
+ case 0x8: /* STBS */
+ case 0xe: /* STWAS */
+ case 0xc: /* STBYS */
+ is_write = 1;
+ }
+ break;
+ }
+
+ return handle_cpu_signal(pc, (unsigned long)info->si_addr,
+ is_write, &uc->uc_sigmask, puc);
+}
+
+#else
+
+#error host CPU specific signal handler needed
+
+#endif
+
+#if defined(TARGET_I386)
+
+void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
+{
+ CPUX86State *saved_env;
+
+ saved_env = env;
+ env = s;
+ if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
+ selector &= 0xffff;
+ cpu_x86_load_seg_cache(env, seg_reg, selector,
+ (selector << 4), 0xffff, 0);
+ } else {
+ helper_load_seg(seg_reg, selector);
+ }
+ env = saved_env;
+}
+
+void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
+{
+ CPUX86State *saved_env;
+
+ saved_env = env;
+ env = s;
+
+ helper_fsave(ptr, data32);
+
+ env = saved_env;
+}
+
+void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
+{
+ CPUX86State *saved_env;
+
+ saved_env = env;
+ env = s;
+
+ helper_frstor(ptr, data32);
+
+ env = saved_env;
+}
+
+#endif /* TARGET_I386 */
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