Commit 1744aea1 authored by Andreas Schwab's avatar Andreas Schwab Committed by Peter Maydell

linux-user: Add signal handling for AArch64

This patch adds signal handling for AArch64. The code is based on the
respective source in the Linux kernel.
Signed-off-by: default avatarAndreas Schwab <schwab@suse.de>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarJohn Rigby <john.rigby@linaro.org>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Message-id: 1378235544-22290-17-git-send-email-peter.maydell@linaro.org
Message-id: 1368505980-17151-10-git-send-email-john.rigby@linaro.org
[PMM: fixed style nits: tabs, long lines;
 pulled target_signal.h in from a later patch; it fits better here]
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 09701199
#ifndef TARGET_SIGNAL_H
#define TARGET_SIGNAL_H
#include "cpu.h"
/* this struct defines a stack used during syscall handling */
typedef struct target_sigaltstack {
abi_ulong ss_sp;
abi_int ss_flags;
abi_ulong ss_size;
} target_stack_t;
/*
* sigaltstack controls
*/
#define TARGET_SS_ONSTACK 1
#define TARGET_SS_DISABLE 2
#define TARGET_MINSIGSTKSZ 2048
#define TARGET_SIGSTKSZ 8192
static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
{
return state->xregs[31];
}
#endif /* TARGET_SIGNAL_H */
......@@ -1092,6 +1092,266 @@ badframe:
return 0;
}
#elif defined(TARGET_AARCH64)
struct target_sigcontext {
uint64_t fault_address;
/* AArch64 registers */
uint64_t regs[31];
uint64_t sp;
uint64_t pc;
uint64_t pstate;
/* 4K reserved for FP/SIMD state and future expansion */
char __reserved[4096] __attribute__((__aligned__(16)));
};
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
target_sigset_t tuc_sigmask;
/* glibc uses a 1024-bit sigset_t */
char __unused[1024 / 8 - sizeof(target_sigset_t)];
/* last for future expansion */
struct target_sigcontext tuc_mcontext;
};
/*
* Header to be used at the beginning of structures extending the user
* context. Such structures must be placed after the rt_sigframe on the stack
* and be 16-byte aligned. The last structure must be a dummy one with the
* magic and size set to 0.
*/
struct target_aarch64_ctx {
uint32_t magic;
uint32_t size;
};
#define TARGET_FPSIMD_MAGIC 0x46508001
struct target_fpsimd_context {
struct target_aarch64_ctx head;
uint32_t fpsr;
uint32_t fpcr;
uint64_t vregs[32 * 2]; /* really uint128_t vregs[32] */
};
/*
* Auxiliary context saved in the sigcontext.__reserved array. Not exported to
* user space as it will change with the addition of new context. User space
* should check the magic/size information.
*/
struct target_aux_context {
struct target_fpsimd_context fpsimd;
/* additional context to be added before "end" */
struct target_aarch64_ctx end;
};
struct target_rt_sigframe {
struct target_siginfo info;
struct target_ucontext uc;
uint64_t fp;
uint64_t lr;
uint32_t tramp[2];
};
static int target_setup_sigframe(struct target_rt_sigframe *sf,
CPUARMState *env, target_sigset_t *set)
{
int i;
struct target_aux_context *aux =
(struct target_aux_context *)sf->uc.tuc_mcontext.__reserved;
/* set up the stack frame for unwinding */
__put_user(env->xregs[29], &sf->fp);
__put_user(env->xregs[30], &sf->lr);
for (i = 0; i < 31; i++) {
__put_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
}
__put_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
__put_user(env->pc, &sf->uc.tuc_mcontext.pc);
__put_user(env->pstate, &sf->uc.tuc_mcontext.pstate);
__put_user(/*current->thread.fault_address*/ 0,
&sf->uc.tuc_mcontext.fault_address);
for (i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &sf->uc.tuc_sigmask.sig[i]);
}
for (i = 0; i < 32; i++) {
#ifdef TARGET_WORDS_BIGENDIAN
__put_user(env->vfp.regs[i * 2], &aux->fpsimd.vregs[i * 2 + 1]);
__put_user(env->vfp.regs[i * 2 + 1], &aux->fpsimd.vregs[i * 2]);
#else
__put_user(env->vfp.regs[i * 2], &aux->fpsimd.vregs[i * 2]);
__put_user(env->vfp.regs[i * 2 + 1], &aux->fpsimd.vregs[i * 2 + 1]);
#endif
}
__put_user(/*env->fpsr*/0, &aux->fpsimd.fpsr);
__put_user(/*env->fpcr*/0, &aux->fpsimd.fpcr);
__put_user(TARGET_FPSIMD_MAGIC, &aux->fpsimd.head.magic);
__put_user(sizeof(struct target_fpsimd_context),
&aux->fpsimd.head.size);
/* set the "end" magic */
__put_user(0, &aux->end.magic);
__put_user(0, &aux->end.size);
return 0;
}
static int target_restore_sigframe(CPUARMState *env,
struct target_rt_sigframe *sf)
{
sigset_t set;
int i;
struct target_aux_context *aux =
(struct target_aux_context *)sf->uc.tuc_mcontext.__reserved;
uint32_t magic, size;
target_to_host_sigset(&set, &sf->uc.tuc_sigmask);
sigprocmask(SIG_SETMASK, &set, NULL);
for (i = 0; i < 31; i++) {
__get_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
}
__get_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
__get_user(env->pc, &sf->uc.tuc_mcontext.pc);
__get_user(env->pstate, &sf->uc.tuc_mcontext.pstate);
__get_user(magic, &aux->fpsimd.head.magic);
__get_user(size, &aux->fpsimd.head.size);
if (magic != TARGET_FPSIMD_MAGIC
|| size != sizeof(struct target_fpsimd_context)) {
return 1;
}
for (i = 0; i < 32 * 2; i++) {
__get_user(env->vfp.regs[i], &aux->fpsimd.vregs[i]);
}
return 0;
}
static abi_ulong get_sigframe(struct target_sigaction *ka, CPUARMState *env)
{
abi_ulong sp;
sp = env->xregs[31];
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) {
sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
}
sp = (sp - sizeof(struct target_rt_sigframe)) & ~15;
return sp;
}
static void target_setup_frame(int usig, struct target_sigaction *ka,
target_siginfo_t *info, target_sigset_t *set,
CPUARMState *env)
{
struct target_rt_sigframe *frame;
abi_ulong frame_addr;
frame_addr = get_sigframe(ka, env);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto give_sigsegv;
}
__put_user(0, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
__put_user(target_sigaltstack_used.ss_sp,
&frame->uc.tuc_stack.ss_sp);
__put_user(sas_ss_flags(env->xregs[31]),
&frame->uc.tuc_stack.ss_flags);
__put_user(target_sigaltstack_used.ss_size,
&frame->uc.tuc_stack.ss_size);
target_setup_sigframe(frame, env, set);
/* mov x8,#__NR_rt_sigreturn; svc #0 */
__put_user(0xd2801168, &frame->tramp[0]);
__put_user(0xd4000001, &frame->tramp[1]);
env->xregs[0] = usig;
env->xregs[31] = frame_addr;
env->xregs[29] = env->xregs[31] + offsetof(struct target_rt_sigframe, fp);
env->pc = ka->_sa_handler;
env->xregs[30] = env->xregs[31] +
offsetof(struct target_rt_sigframe, tramp);
if (info) {
if (copy_siginfo_to_user(&frame->info, info)) {
goto give_sigsegv;
}
env->xregs[1] = frame_addr + offsetof(struct target_rt_sigframe, info);
env->xregs[2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
}
unlock_user_struct(frame, frame_addr, 1);
return;
give_sigsegv:
unlock_user_struct(frame, frame_addr, 1);
force_sig(TARGET_SIGSEGV);
}
static void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info, target_sigset_t *set,
CPUARMState *env)
{
target_setup_frame(sig, ka, info, set, env);
}
static void setup_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUARMState *env)
{
target_setup_frame(sig, ka, 0, set, env);
}
long do_rt_sigreturn(CPUARMState *env)
{
struct target_rt_sigframe *frame;
abi_ulong frame_addr = env->xregs[31];
if (frame_addr & 15) {
goto badframe;
}
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
if (target_restore_sigframe(env, frame)) {
goto badframe;
}
if (do_sigaltstack(frame_addr +
offsetof(struct target_rt_sigframe, uc.tuc_stack),
0, get_sp_from_cpustate(env)) == -EFAULT) {
goto badframe;
}
unlock_user_struct(frame, frame_addr, 0);
return env->xregs[0];
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
return 0;
}
long do_sigreturn(CPUARMState *env)
{
return do_rt_sigreturn(env);
}
#elif defined(TARGET_ARM)
struct target_sigcontext {
......
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