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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: Andreas Schwab <schwab@suse.de> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: John Rigby <john.rigby@linaro.org> Signed-off-by: Peter 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: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andreas Schwab
Peter Maydell
parent
09701199f6
commit
1744aea182
2 changed files with 289 additions and 0 deletions
29
linux-user/aarch64/target_signal.h
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29
linux-user/aarch64/target_signal.h
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@ -0,0 +1,29 @@
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#ifndef TARGET_SIGNAL_H
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#define TARGET_SIGNAL_H
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#include "cpu.h"
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/* this struct defines a stack used during syscall handling */
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typedef struct target_sigaltstack {
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abi_ulong ss_sp;
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abi_int ss_flags;
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abi_ulong ss_size;
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} target_stack_t;
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/*
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* sigaltstack controls
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*/
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#define TARGET_SS_ONSTACK 1
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#define TARGET_SS_DISABLE 2
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#define TARGET_MINSIGSTKSZ 2048
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#define TARGET_SIGSTKSZ 8192
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static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
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{
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return state->xregs[31];
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}
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#endif /* TARGET_SIGNAL_H */
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@ -1092,6 +1092,266 @@ badframe:
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return 0;
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}
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#elif defined(TARGET_AARCH64)
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struct target_sigcontext {
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uint64_t fault_address;
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/* AArch64 registers */
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uint64_t regs[31];
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uint64_t sp;
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uint64_t pc;
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uint64_t pstate;
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/* 4K reserved for FP/SIMD state and future expansion */
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char __reserved[4096] __attribute__((__aligned__(16)));
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};
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struct target_ucontext {
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abi_ulong tuc_flags;
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abi_ulong tuc_link;
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target_stack_t tuc_stack;
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target_sigset_t tuc_sigmask;
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/* glibc uses a 1024-bit sigset_t */
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char __unused[1024 / 8 - sizeof(target_sigset_t)];
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/* last for future expansion */
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struct target_sigcontext tuc_mcontext;
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};
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/*
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* Header to be used at the beginning of structures extending the user
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* context. Such structures must be placed after the rt_sigframe on the stack
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* and be 16-byte aligned. The last structure must be a dummy one with the
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* magic and size set to 0.
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*/
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struct target_aarch64_ctx {
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uint32_t magic;
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uint32_t size;
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};
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#define TARGET_FPSIMD_MAGIC 0x46508001
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struct target_fpsimd_context {
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struct target_aarch64_ctx head;
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uint32_t fpsr;
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uint32_t fpcr;
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uint64_t vregs[32 * 2]; /* really uint128_t vregs[32] */
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};
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/*
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* Auxiliary context saved in the sigcontext.__reserved array. Not exported to
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* user space as it will change with the addition of new context. User space
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* should check the magic/size information.
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*/
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struct target_aux_context {
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struct target_fpsimd_context fpsimd;
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/* additional context to be added before "end" */
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struct target_aarch64_ctx end;
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};
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struct target_rt_sigframe {
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struct target_siginfo info;
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struct target_ucontext uc;
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uint64_t fp;
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uint64_t lr;
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uint32_t tramp[2];
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};
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static int target_setup_sigframe(struct target_rt_sigframe *sf,
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CPUARMState *env, target_sigset_t *set)
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{
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int i;
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struct target_aux_context *aux =
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(struct target_aux_context *)sf->uc.tuc_mcontext.__reserved;
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/* set up the stack frame for unwinding */
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__put_user(env->xregs[29], &sf->fp);
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__put_user(env->xregs[30], &sf->lr);
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for (i = 0; i < 31; i++) {
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__put_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
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}
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__put_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
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__put_user(env->pc, &sf->uc.tuc_mcontext.pc);
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__put_user(env->pstate, &sf->uc.tuc_mcontext.pstate);
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__put_user(/*current->thread.fault_address*/ 0,
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&sf->uc.tuc_mcontext.fault_address);
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for (i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &sf->uc.tuc_sigmask.sig[i]);
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}
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for (i = 0; i < 32; i++) {
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#ifdef TARGET_WORDS_BIGENDIAN
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__put_user(env->vfp.regs[i * 2], &aux->fpsimd.vregs[i * 2 + 1]);
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__put_user(env->vfp.regs[i * 2 + 1], &aux->fpsimd.vregs[i * 2]);
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#else
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__put_user(env->vfp.regs[i * 2], &aux->fpsimd.vregs[i * 2]);
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__put_user(env->vfp.regs[i * 2 + 1], &aux->fpsimd.vregs[i * 2 + 1]);
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#endif
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}
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__put_user(/*env->fpsr*/0, &aux->fpsimd.fpsr);
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__put_user(/*env->fpcr*/0, &aux->fpsimd.fpcr);
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__put_user(TARGET_FPSIMD_MAGIC, &aux->fpsimd.head.magic);
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__put_user(sizeof(struct target_fpsimd_context),
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&aux->fpsimd.head.size);
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/* set the "end" magic */
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__put_user(0, &aux->end.magic);
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__put_user(0, &aux->end.size);
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return 0;
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}
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static int target_restore_sigframe(CPUARMState *env,
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struct target_rt_sigframe *sf)
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{
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sigset_t set;
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int i;
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struct target_aux_context *aux =
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(struct target_aux_context *)sf->uc.tuc_mcontext.__reserved;
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uint32_t magic, size;
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target_to_host_sigset(&set, &sf->uc.tuc_sigmask);
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sigprocmask(SIG_SETMASK, &set, NULL);
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for (i = 0; i < 31; i++) {
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__get_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
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}
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__get_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
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__get_user(env->pc, &sf->uc.tuc_mcontext.pc);
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__get_user(env->pstate, &sf->uc.tuc_mcontext.pstate);
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__get_user(magic, &aux->fpsimd.head.magic);
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__get_user(size, &aux->fpsimd.head.size);
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if (magic != TARGET_FPSIMD_MAGIC
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|| size != sizeof(struct target_fpsimd_context)) {
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return 1;
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}
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for (i = 0; i < 32 * 2; i++) {
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__get_user(env->vfp.regs[i], &aux->fpsimd.vregs[i]);
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}
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return 0;
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}
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static abi_ulong get_sigframe(struct target_sigaction *ka, CPUARMState *env)
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{
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abi_ulong sp;
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sp = env->xregs[31];
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/*
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* This is the X/Open sanctioned signal stack switching.
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*/
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if ((ka->sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) {
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sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
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}
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sp = (sp - sizeof(struct target_rt_sigframe)) & ~15;
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return sp;
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}
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static void target_setup_frame(int usig, struct target_sigaction *ka,
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target_siginfo_t *info, target_sigset_t *set,
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CPUARMState *env)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr;
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frame_addr = get_sigframe(ka, env);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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__put_user(0, &frame->uc.tuc_flags);
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__put_user(0, &frame->uc.tuc_link);
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__put_user(target_sigaltstack_used.ss_sp,
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&frame->uc.tuc_stack.ss_sp);
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__put_user(sas_ss_flags(env->xregs[31]),
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&frame->uc.tuc_stack.ss_flags);
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__put_user(target_sigaltstack_used.ss_size,
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&frame->uc.tuc_stack.ss_size);
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target_setup_sigframe(frame, env, set);
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/* mov x8,#__NR_rt_sigreturn; svc #0 */
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__put_user(0xd2801168, &frame->tramp[0]);
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__put_user(0xd4000001, &frame->tramp[1]);
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env->xregs[0] = usig;
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env->xregs[31] = frame_addr;
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env->xregs[29] = env->xregs[31] + offsetof(struct target_rt_sigframe, fp);
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env->pc = ka->_sa_handler;
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env->xregs[30] = env->xregs[31] +
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offsetof(struct target_rt_sigframe, tramp);
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if (info) {
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if (copy_siginfo_to_user(&frame->info, info)) {
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goto give_sigsegv;
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}
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env->xregs[1] = frame_addr + offsetof(struct target_rt_sigframe, info);
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env->xregs[2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
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}
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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unlock_user_struct(frame, frame_addr, 1);
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force_sig(TARGET_SIGSEGV);
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}
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static void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info, target_sigset_t *set,
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CPUARMState *env)
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{
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target_setup_frame(sig, ka, info, set, env);
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}
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static void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUARMState *env)
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{
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target_setup_frame(sig, ka, 0, set, env);
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}
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long do_rt_sigreturn(CPUARMState *env)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr = env->xregs[31];
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if (frame_addr & 15) {
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goto badframe;
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}
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if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
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goto badframe;
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}
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if (target_restore_sigframe(env, frame)) {
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goto badframe;
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}
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if (do_sigaltstack(frame_addr +
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offsetof(struct target_rt_sigframe, uc.tuc_stack),
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0, get_sp_from_cpustate(env)) == -EFAULT) {
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goto badframe;
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}
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unlock_user_struct(frame, frame_addr, 0);
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return env->xregs[0];
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badframe:
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unlock_user_struct(frame, frame_addr, 0);
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force_sig(TARGET_SIGSEGV);
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return 0;
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}
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long do_sigreturn(CPUARMState *env)
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{
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return do_rt_sigreturn(env);
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}
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#elif defined(TARGET_ARM)
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struct target_sigcontext {
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