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qemu/linux-user/arm/signal.c
Laurent Vivier 465e237bf7 linux-user: introduce target_sigsp() and target_save_altstack() 
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180411192347.30228-1-laurent@vivier.eu>
2018-05-03 18:29:15 +02:00

837 lines
24 KiB
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/*
* Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "target_signal.h"
#include "signal-common.h"
#include "linux-user/trace.h"
struct target_sigcontext {
abi_ulong trap_no;
abi_ulong error_code;
abi_ulong oldmask;
abi_ulong arm_r0;
abi_ulong arm_r1;
abi_ulong arm_r2;
abi_ulong arm_r3;
abi_ulong arm_r4;
abi_ulong arm_r5;
abi_ulong arm_r6;
abi_ulong arm_r7;
abi_ulong arm_r8;
abi_ulong arm_r9;
abi_ulong arm_r10;
abi_ulong arm_fp;
abi_ulong arm_ip;
abi_ulong arm_sp;
abi_ulong arm_lr;
abi_ulong arm_pc;
abi_ulong arm_cpsr;
abi_ulong fault_address;
};
struct target_ucontext_v1 {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
struct target_ucontext_v2 {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
char __unused[128 - sizeof(target_sigset_t)];
abi_ulong tuc_regspace[128] __attribute__((__aligned__(8)));
};
struct target_user_vfp {
uint64_t fpregs[32];
abi_ulong fpscr;
};
struct target_user_vfp_exc {
abi_ulong fpexc;
abi_ulong fpinst;
abi_ulong fpinst2;
};
struct target_vfp_sigframe {
abi_ulong magic;
abi_ulong size;
struct target_user_vfp ufp;
struct target_user_vfp_exc ufp_exc;
} __attribute__((__aligned__(8)));
struct target_iwmmxt_sigframe {
abi_ulong magic;
abi_ulong size;
uint64_t regs[16];
/* Note that not all the coprocessor control registers are stored here */
uint32_t wcssf;
uint32_t wcasf;
uint32_t wcgr0;
uint32_t wcgr1;
uint32_t wcgr2;
uint32_t wcgr3;
} __attribute__((__aligned__(8)));
#define TARGET_VFP_MAGIC 0x56465001
#define TARGET_IWMMXT_MAGIC 0x12ef842a
struct sigframe_v1
{
struct target_sigcontext sc;
abi_ulong extramask[TARGET_NSIG_WORDS-1];
abi_ulong retcode[4];
};
struct sigframe_v2
{
struct target_ucontext_v2 uc;
abi_ulong retcode[4];
};
struct rt_sigframe_v1
{
abi_ulong pinfo;
abi_ulong puc;
struct target_siginfo info;
struct target_ucontext_v1 uc;
abi_ulong retcode[4];
};
struct rt_sigframe_v2
{
struct target_siginfo info;
struct target_ucontext_v2 uc;
abi_ulong retcode[4];
};
#define TARGET_CONFIG_CPU_32 1
/*
* For ARM syscalls, we encode the syscall number into the instruction.
*/
#define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
#define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
/*
* For Thumb syscalls, we pass the syscall number via r7. We therefore
* need two 16-bit instructions.
*/
#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
static const abi_ulong retcodes[4] = {
SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
};
/*
* Stub needed to make sure the FD register (r9) contains the right
* value.
*/
static const unsigned long sigreturn_fdpic_codes[3] = {
0xe59fc004, /* ldr r12, [pc, #4] to read function descriptor */
0xe59c9004, /* ldr r9, [r12, #4] to setup GOT */
0xe59cf000 /* ldr pc, [r12] to jump into restorer */
};
static const unsigned long sigreturn_fdpic_thumb_codes[3] = {
0xc008f8df, /* ldr r12, [pc, #8] to read function descriptor */
0x9004f8dc, /* ldr r9, [r12, #4] to setup GOT */
0xf000f8dc /* ldr pc, [r12] to jump into restorer */
};
static inline int valid_user_regs(CPUARMState *regs)
{
return 1;
}
static void
setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
CPUARMState *env, abi_ulong mask)
{
__put_user(env->regs[0], &sc->arm_r0);
__put_user(env->regs[1], &sc->arm_r1);
__put_user(env->regs[2], &sc->arm_r2);
__put_user(env->regs[3], &sc->arm_r3);
__put_user(env->regs[4], &sc->arm_r4);
__put_user(env->regs[5], &sc->arm_r5);
__put_user(env->regs[6], &sc->arm_r6);
__put_user(env->regs[7], &sc->arm_r7);
__put_user(env->regs[8], &sc->arm_r8);
__put_user(env->regs[9], &sc->arm_r9);
__put_user(env->regs[10], &sc->arm_r10);
__put_user(env->regs[11], &sc->arm_fp);
__put_user(env->regs[12], &sc->arm_ip);
__put_user(env->regs[13], &sc->arm_sp);
__put_user(env->regs[14], &sc->arm_lr);
__put_user(env->regs[15], &sc->arm_pc);
#ifdef TARGET_CONFIG_CPU_32
__put_user(cpsr_read(env), &sc->arm_cpsr);
#endif
__put_user(/* current->thread.trap_no */ 0, &sc->trap_no);
__put_user(/* current->thread.error_code */ 0, &sc->error_code);
__put_user(/* current->thread.address */ 0, &sc->fault_address);
__put_user(mask, &sc->oldmask);
}
static inline abi_ulong
get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
{
unsigned long sp;
sp = target_sigsp(get_sp_from_cpustate(regs), ka);
/*
* ATPCS B01 mandates 8-byte alignment
*/
return (sp - framesize) & ~7;
}
static int
setup_return(CPUARMState *env, struct target_sigaction *ka,
abi_ulong *rc, abi_ulong frame_addr, int usig, abi_ulong rc_addr)
{
abi_ulong handler = 0;
abi_ulong handler_fdpic_GOT = 0;
abi_ulong retcode;
int thumb;
int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
if (is_fdpic) {
/* In FDPIC mode, ka->_sa_handler points to a function
* descriptor (FD). The first word contains the address of the
* handler. The second word contains the value of the PIC
* register (r9). */
abi_ulong funcdesc_ptr = ka->_sa_handler;
if (get_user_ual(handler, funcdesc_ptr)
|| get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) {
return 1;
}
} else {
handler = ka->_sa_handler;
}
thumb = handler & 1;
uint32_t cpsr = cpsr_read(env);
cpsr &= ~CPSR_IT;
if (thumb) {
cpsr |= CPSR_T;
} else {
cpsr &= ~CPSR_T;
}
if (ka->sa_flags & TARGET_SA_RESTORER) {
if (is_fdpic) {
/* For FDPIC we ensure that the restorer is called with a
* correct r9 value. For that we need to write code on
* the stack that sets r9 and jumps back to restorer
* value.
*/
if (thumb) {
__put_user(sigreturn_fdpic_thumb_codes[0], rc);
__put_user(sigreturn_fdpic_thumb_codes[1], rc + 1);
__put_user(sigreturn_fdpic_thumb_codes[2], rc + 2);
__put_user((abi_ulong)ka->sa_restorer, rc + 3);
} else {
__put_user(sigreturn_fdpic_codes[0], rc);
__put_user(sigreturn_fdpic_codes[1], rc + 1);
__put_user(sigreturn_fdpic_codes[2], rc + 2);
__put_user((abi_ulong)ka->sa_restorer, rc + 3);
}
retcode = rc_addr + thumb;
} else {
retcode = ka->sa_restorer;
}
} else {
unsigned int idx = thumb;
if (ka->sa_flags & TARGET_SA_SIGINFO) {
idx += 2;
}
__put_user(retcodes[idx], rc);
retcode = rc_addr + thumb;
}
env->regs[0] = usig;
if (is_fdpic) {
env->regs[9] = handler_fdpic_GOT;
}
env->regs[13] = frame_addr;
env->regs[14] = retcode;
env->regs[15] = handler & (thumb ? ~1 : ~3);
cpsr_write(env, cpsr, CPSR_IT | CPSR_T, CPSRWriteByInstr);
return 0;
}
static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
{
int i;
struct target_vfp_sigframe *vfpframe;
vfpframe = (struct target_vfp_sigframe *)regspace;
__put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
__put_user(sizeof(*vfpframe), &vfpframe->size);
for (i = 0; i < 32; i++) {
__put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
}
__put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
__put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
__put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
__put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
return (abi_ulong*)(vfpframe+1);
}
static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
CPUARMState *env)
{
int i;
struct target_iwmmxt_sigframe *iwmmxtframe;
iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
__put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
__put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
for (i = 0; i < 16; i++) {
__put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
}
__put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
__put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
__put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
__put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
__put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
__put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
return (abi_ulong*)(iwmmxtframe+1);
}
static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
target_sigset_t *set, CPUARMState *env)
{
struct target_sigaltstack stack;
int i;
abi_ulong *regspace;
/* Clear all the bits of the ucontext we don't use. */
memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
memset(&stack, 0, sizeof(stack));
target_save_altstack(&stack, env);
memcpy(&uc->tuc_stack, &stack, sizeof(stack));
setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
/* Save coprocessor signal frame. */
regspace = uc->tuc_regspace;
if (arm_feature(env, ARM_FEATURE_VFP)) {
regspace = setup_sigframe_v2_vfp(regspace, env);
}
if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
regspace = setup_sigframe_v2_iwmmxt(regspace, env);
}
/* Write terminating magic word */
__put_user(0, regspace);
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
}
}
/* compare linux/arch/arm/kernel/signal.c:setup_frame() */
static void setup_frame_v1(int usig, struct target_sigaction *ka,
target_sigset_t *set, CPUARMState *regs)
{
struct sigframe_v1 *frame;
abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
int i;
trace_user_setup_frame(regs, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto sigsegv;
}
setup_sigcontext(&frame->sc, regs, set->sig[0]);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &frame->extramask[i - 1]);
}
if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
frame_addr + offsetof(struct sigframe_v1, retcode))) {
goto sigsegv;
}
unlock_user_struct(frame, frame_addr, 1);
return;
sigsegv:
unlock_user_struct(frame, frame_addr, 1);
force_sigsegv(usig);
}
static void setup_frame_v2(int usig, struct target_sigaction *ka,
target_sigset_t *set, CPUARMState *regs)
{
struct sigframe_v2 *frame;
abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
trace_user_setup_frame(regs, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto sigsegv;
}
setup_sigframe_v2(&frame->uc, set, regs);
if (setup_return(regs, ka, frame->retcode, frame_addr, usig,
frame_addr + offsetof(struct sigframe_v2, retcode))) {
goto sigsegv;
}
unlock_user_struct(frame, frame_addr, 1);
return;
sigsegv:
unlock_user_struct(frame, frame_addr, 1);
force_sigsegv(usig);
}
void setup_frame(int usig, struct target_sigaction *ka,
target_sigset_t *set, CPUARMState *regs)
{
if (get_osversion() >= 0x020612) {
setup_frame_v2(usig, ka, set, regs);
} else {
setup_frame_v1(usig, ka, set, regs);
}
}
/* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUARMState *env)
{
struct rt_sigframe_v1 *frame;
abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
struct target_sigaltstack stack;
int i;
abi_ulong info_addr, uc_addr;
trace_user_setup_rt_frame(env, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto sigsegv;
}
info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
__put_user(info_addr, &frame->pinfo);
uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
__put_user(uc_addr, &frame->puc);
tswap_siginfo(&frame->info, info);
/* Clear all the bits of the ucontext we don't use. */
memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
memset(&stack, 0, sizeof(stack));
target_save_altstack(&stack, env);
memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
}
if (setup_return(env, ka, frame->retcode, frame_addr, usig,
frame_addr + offsetof(struct rt_sigframe_v1, retcode))) {
goto sigsegv;
}
env->regs[1] = info_addr;
env->regs[2] = uc_addr;
unlock_user_struct(frame, frame_addr, 1);
return;
sigsegv:
unlock_user_struct(frame, frame_addr, 1);
force_sigsegv(usig);
}
static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUARMState *env)
{
struct rt_sigframe_v2 *frame;
abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
abi_ulong info_addr, uc_addr;
trace_user_setup_rt_frame(env, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto sigsegv;
}
info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
tswap_siginfo(&frame->info, info);
setup_sigframe_v2(&frame->uc, set, env);
if (setup_return(env, ka, frame->retcode, frame_addr, usig,
frame_addr + offsetof(struct rt_sigframe_v2, retcode))) {
goto sigsegv;
}
env->regs[1] = info_addr;
env->regs[2] = uc_addr;
unlock_user_struct(frame, frame_addr, 1);
return;
sigsegv:
unlock_user_struct(frame, frame_addr, 1);
force_sigsegv(usig);
}
void setup_rt_frame(int usig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUARMState *env)
{
if (get_osversion() >= 0x020612) {
setup_rt_frame_v2(usig, ka, info, set, env);
} else {
setup_rt_frame_v1(usig, ka, info, set, env);
}
}
static int
restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
{
int err = 0;
uint32_t cpsr;
__get_user(env->regs[0], &sc->arm_r0);
__get_user(env->regs[1], &sc->arm_r1);
__get_user(env->regs[2], &sc->arm_r2);
__get_user(env->regs[3], &sc->arm_r3);
__get_user(env->regs[4], &sc->arm_r4);
__get_user(env->regs[5], &sc->arm_r5);
__get_user(env->regs[6], &sc->arm_r6);
__get_user(env->regs[7], &sc->arm_r7);
__get_user(env->regs[8], &sc->arm_r8);
__get_user(env->regs[9], &sc->arm_r9);
__get_user(env->regs[10], &sc->arm_r10);
__get_user(env->regs[11], &sc->arm_fp);
__get_user(env->regs[12], &sc->arm_ip);
__get_user(env->regs[13], &sc->arm_sp);
__get_user(env->regs[14], &sc->arm_lr);
__get_user(env->regs[15], &sc->arm_pc);
#ifdef TARGET_CONFIG_CPU_32
__get_user(cpsr, &sc->arm_cpsr);
cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
#endif
err |= !valid_user_regs(env);
return err;
}
static long do_sigreturn_v1(CPUARMState *env)
{
abi_ulong frame_addr;
struct sigframe_v1 *frame = NULL;
target_sigset_t set;
sigset_t host_set;
int i;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
frame_addr = env->regs[13];
trace_user_do_sigreturn(env, frame_addr);
if (frame_addr & 7) {
goto badframe;
}
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
__get_user(set.sig[0], &frame->sc.oldmask);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
__get_user(set.sig[i], &frame->extramask[i - 1]);
}
target_to_host_sigset_internal(&host_set, &set);
set_sigmask(&host_set);
if (restore_sigcontext(env, &frame->sc)) {
goto badframe;
}
#if 0
/* Send SIGTRAP if we're single-stepping */
if (ptrace_cancel_bpt(current))
send_sig(SIGTRAP, current, 1);
#endif
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
{
int i;
abi_ulong magic, sz;
uint32_t fpscr, fpexc;
struct target_vfp_sigframe *vfpframe;
vfpframe = (struct target_vfp_sigframe *)regspace;
__get_user(magic, &vfpframe->magic);
__get_user(sz, &vfpframe->size);
if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
return 0;
}
for (i = 0; i < 32; i++) {
__get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
}
__get_user(fpscr, &vfpframe->ufp.fpscr);
vfp_set_fpscr(env, fpscr);
__get_user(fpexc, &vfpframe->ufp_exc.fpexc);
/* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
* and the exception flag is cleared
*/
fpexc |= (1 << 30);
fpexc &= ~((1 << 31) | (1 << 28));
env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
__get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
__get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
return (abi_ulong*)(vfpframe + 1);
}
static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
abi_ulong *regspace)
{
int i;
abi_ulong magic, sz;
struct target_iwmmxt_sigframe *iwmmxtframe;
iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
__get_user(magic, &iwmmxtframe->magic);
__get_user(sz, &iwmmxtframe->size);
if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
return 0;
}
for (i = 0; i < 16; i++) {
__get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
}
__get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
__get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
__get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
__get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
__get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
__get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
return (abi_ulong*)(iwmmxtframe + 1);
}
static int do_sigframe_return_v2(CPUARMState *env,
target_ulong context_addr,
struct target_ucontext_v2 *uc)
{
sigset_t host_set;
abi_ulong *regspace;
target_to_host_sigset(&host_set, &uc->tuc_sigmask);
set_sigmask(&host_set);
if (restore_sigcontext(env, &uc->tuc_mcontext))
return 1;
/* Restore coprocessor signal frame */
regspace = uc->tuc_regspace;
if (arm_feature(env, ARM_FEATURE_VFP)) {
regspace = restore_sigframe_v2_vfp(env, regspace);
if (!regspace) {
return 1;
}
}
if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
regspace = restore_sigframe_v2_iwmmxt(env, regspace);
if (!regspace) {
return 1;
}
}
if (do_sigaltstack(context_addr
+ offsetof(struct target_ucontext_v2, tuc_stack),
0, get_sp_from_cpustate(env)) == -EFAULT) {
return 1;
}
#if 0
/* Send SIGTRAP if we're single-stepping */
if (ptrace_cancel_bpt(current))
send_sig(SIGTRAP, current, 1);
#endif
return 0;
}
static long do_sigreturn_v2(CPUARMState *env)
{
abi_ulong frame_addr;
struct sigframe_v2 *frame = NULL;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
frame_addr = env->regs[13];
trace_user_do_sigreturn(env, frame_addr);
if (frame_addr & 7) {
goto badframe;
}
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
if (do_sigframe_return_v2(env,
frame_addr
+ offsetof(struct sigframe_v2, uc),
&frame->uc)) {
goto badframe;
}
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
long do_sigreturn(CPUARMState *env)
{
if (get_osversion() >= 0x020612) {
return do_sigreturn_v2(env);
} else {
return do_sigreturn_v1(env);
}
}
static long do_rt_sigreturn_v1(CPUARMState *env)
{
abi_ulong frame_addr;
struct rt_sigframe_v1 *frame = NULL;
sigset_t host_set;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
frame_addr = env->regs[13];
trace_user_do_rt_sigreturn(env, frame_addr);
if (frame_addr & 7) {
goto badframe;
}
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
set_sigmask(&host_set);
if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
goto badframe;
}
if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
goto badframe;
#if 0
/* Send SIGTRAP if we're single-stepping */
if (ptrace_cancel_bpt(current))
send_sig(SIGTRAP, current, 1);
#endif
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
static long do_rt_sigreturn_v2(CPUARMState *env)
{
abi_ulong frame_addr;
struct rt_sigframe_v2 *frame = NULL;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
frame_addr = env->regs[13];
trace_user_do_rt_sigreturn(env, frame_addr);
if (frame_addr & 7) {
goto badframe;
}
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
if (do_sigframe_return_v2(env,
frame_addr
+ offsetof(struct rt_sigframe_v2, uc),
&frame->uc)) {
goto badframe;
}
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
long do_rt_sigreturn(CPUARMState *env)
{
if (get_osversion() >= 0x020612) {
return do_rt_sigreturn_v2(env);
} else {
return do_rt_sigreturn_v1(env);
}
}
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