diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 567 |
1 files changed, 1 insertions, 566 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 0f956740ef..fcfa023d42 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -1383,572 +1383,7 @@ badframe: return -TARGET_QEMU_ESIGRETURN; } -#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] */ -}; - -#define TARGET_EXTRA_MAGIC 0x45585401 - -struct target_extra_context { - struct target_aarch64_ctx head; - uint64_t datap; /* 16-byte aligned pointer to extra space cast to __u64 */ - uint32_t size; /* size in bytes of the extra space */ - uint32_t reserved[3]; -}; - -#define TARGET_SVE_MAGIC 0x53564501 - -struct target_sve_context { - struct target_aarch64_ctx head; - uint16_t vl; - uint16_t reserved[3]; - /* The actual SVE data immediately follows. It is layed out - * according to TARGET_SVE_SIG_{Z,P}REG_OFFSET, based off of - * the original struct pointer. - */ -}; - -#define TARGET_SVE_VQ_BYTES 16 - -#define TARGET_SVE_SIG_ZREG_SIZE(VQ) ((VQ) * TARGET_SVE_VQ_BYTES) -#define TARGET_SVE_SIG_PREG_SIZE(VQ) ((VQ) * (TARGET_SVE_VQ_BYTES / 8)) - -#define TARGET_SVE_SIG_REGS_OFFSET \ - QEMU_ALIGN_UP(sizeof(struct target_sve_context), TARGET_SVE_VQ_BYTES) -#define TARGET_SVE_SIG_ZREG_OFFSET(VQ, N) \ - (TARGET_SVE_SIG_REGS_OFFSET + TARGET_SVE_SIG_ZREG_SIZE(VQ) * (N)) -#define TARGET_SVE_SIG_PREG_OFFSET(VQ, N) \ - (TARGET_SVE_SIG_ZREG_OFFSET(VQ, 32) + TARGET_SVE_SIG_PREG_SIZE(VQ) * (N)) -#define TARGET_SVE_SIG_FFR_OFFSET(VQ) \ - (TARGET_SVE_SIG_PREG_OFFSET(VQ, 16)) -#define TARGET_SVE_SIG_CONTEXT_SIZE(VQ) \ - (TARGET_SVE_SIG_PREG_OFFSET(VQ, 17)) - -struct target_rt_sigframe { - struct target_siginfo info; - struct target_ucontext uc; -}; - -struct target_rt_frame_record { - uint64_t fp; - uint64_t lr; - uint32_t tramp[2]; -}; - -static void target_setup_general_frame(struct target_rt_sigframe *sf, - CPUARMState *env, target_sigset_t *set) -{ - int i; - - __put_user(0, &sf->uc.tuc_flags); - __put_user(0, &sf->uc.tuc_link); - - __put_user(target_sigaltstack_used.ss_sp, &sf->uc.tuc_stack.ss_sp); - __put_user(sas_ss_flags(env->xregs[31]), &sf->uc.tuc_stack.ss_flags); - __put_user(target_sigaltstack_used.ss_size, &sf->uc.tuc_stack.ss_size); - - 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(pstate_read(env), &sf->uc.tuc_mcontext.pstate); - - __put_user(env->exception.vaddress, &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]); - } -} - -static void target_setup_fpsimd_record(struct target_fpsimd_context *fpsimd, - CPUARMState *env) -{ - int i; - - __put_user(TARGET_FPSIMD_MAGIC, &fpsimd->head.magic); - __put_user(sizeof(struct target_fpsimd_context), &fpsimd->head.size); - __put_user(vfp_get_fpsr(env), &fpsimd->fpsr); - __put_user(vfp_get_fpcr(env), &fpsimd->fpcr); - - for (i = 0; i < 32; i++) { - uint64_t *q = aa64_vfp_qreg(env, i); -#ifdef TARGET_WORDS_BIGENDIAN - __put_user(q[0], &fpsimd->vregs[i * 2 + 1]); - __put_user(q[1], &fpsimd->vregs[i * 2]); -#else - __put_user(q[0], &fpsimd->vregs[i * 2]); - __put_user(q[1], &fpsimd->vregs[i * 2 + 1]); -#endif - } -} - -static void target_setup_extra_record(struct target_extra_context *extra, - uint64_t datap, uint32_t extra_size) -{ - __put_user(TARGET_EXTRA_MAGIC, &extra->head.magic); - __put_user(sizeof(struct target_extra_context), &extra->head.size); - __put_user(datap, &extra->datap); - __put_user(extra_size, &extra->size); -} - -static void target_setup_end_record(struct target_aarch64_ctx *end) -{ - __put_user(0, &end->magic); - __put_user(0, &end->size); -} - -static void target_setup_sve_record(struct target_sve_context *sve, - CPUARMState *env, int vq, int size) -{ - int i, j; - - __put_user(TARGET_SVE_MAGIC, &sve->head.magic); - __put_user(size, &sve->head.size); - __put_user(vq * TARGET_SVE_VQ_BYTES, &sve->vl); - - /* Note that SVE regs are stored as a byte stream, with each byte element - * at a subsequent address. This corresponds to a little-endian store - * of our 64-bit hunks. - */ - for (i = 0; i < 32; ++i) { - uint64_t *z = (void *)sve + TARGET_SVE_SIG_ZREG_OFFSET(vq, i); - for (j = 0; j < vq * 2; ++j) { - __put_user_e(env->vfp.zregs[i].d[j], z + j, le); - } - } - for (i = 0; i <= 16; ++i) { - uint16_t *p = (void *)sve + TARGET_SVE_SIG_PREG_OFFSET(vq, i); - for (j = 0; j < vq; ++j) { - uint64_t r = env->vfp.pregs[i].p[j >> 2]; - __put_user_e(r >> ((j & 3) * 16), p + j, le); - } - } -} - -static void target_restore_general_frame(CPUARMState *env, - struct target_rt_sigframe *sf) -{ - sigset_t set; - uint64_t pstate; - int i; - - target_to_host_sigset(&set, &sf->uc.tuc_sigmask); - set_sigmask(&set); - - 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(pstate, &sf->uc.tuc_mcontext.pstate); - pstate_write(env, pstate); -} - -static void target_restore_fpsimd_record(CPUARMState *env, - struct target_fpsimd_context *fpsimd) -{ - uint32_t fpsr, fpcr; - int i; - - __get_user(fpsr, &fpsimd->fpsr); - vfp_set_fpsr(env, fpsr); - __get_user(fpcr, &fpsimd->fpcr); - vfp_set_fpcr(env, fpcr); - - for (i = 0; i < 32; i++) { - uint64_t *q = aa64_vfp_qreg(env, i); -#ifdef TARGET_WORDS_BIGENDIAN - __get_user(q[0], &fpsimd->vregs[i * 2 + 1]); - __get_user(q[1], &fpsimd->vregs[i * 2]); -#else - __get_user(q[0], &fpsimd->vregs[i * 2]); - __get_user(q[1], &fpsimd->vregs[i * 2 + 1]); -#endif - } -} - -static void target_restore_sve_record(CPUARMState *env, - struct target_sve_context *sve, int vq) -{ - int i, j; - - /* Note that SVE regs are stored as a byte stream, with each byte element - * at a subsequent address. This corresponds to a little-endian load - * of our 64-bit hunks. - */ - for (i = 0; i < 32; ++i) { - uint64_t *z = (void *)sve + TARGET_SVE_SIG_ZREG_OFFSET(vq, i); - for (j = 0; j < vq * 2; ++j) { - __get_user_e(env->vfp.zregs[i].d[j], z + j, le); - } - } - for (i = 0; i <= 16; ++i) { - uint16_t *p = (void *)sve + TARGET_SVE_SIG_PREG_OFFSET(vq, i); - for (j = 0; j < vq; ++j) { - uint16_t r; - __get_user_e(r, p + j, le); - if (j & 3) { - env->vfp.pregs[i].p[j >> 2] |= (uint64_t)r << ((j & 3) * 16); - } else { - env->vfp.pregs[i].p[j >> 2] = r; - } - } - } -} - -static int target_restore_sigframe(CPUARMState *env, - struct target_rt_sigframe *sf) -{ - struct target_aarch64_ctx *ctx, *extra = NULL; - struct target_fpsimd_context *fpsimd = NULL; - struct target_sve_context *sve = NULL; - uint64_t extra_datap = 0; - bool used_extra = false; - bool err = false; - int vq = 0, sve_size = 0; - - target_restore_general_frame(env, sf); - - ctx = (struct target_aarch64_ctx *)sf->uc.tuc_mcontext.__reserved; - while (ctx) { - uint32_t magic, size, extra_size; - - __get_user(magic, &ctx->magic); - __get_user(size, &ctx->size); - switch (magic) { - case 0: - if (size != 0) { - err = true; - goto exit; - } - if (used_extra) { - ctx = NULL; - } else { - ctx = extra; - used_extra = true; - } - continue; - - case TARGET_FPSIMD_MAGIC: - if (fpsimd || size != sizeof(struct target_fpsimd_context)) { - err = true; - goto exit; - } - fpsimd = (struct target_fpsimd_context *)ctx; - break; - - case TARGET_SVE_MAGIC: - if (arm_feature(env, ARM_FEATURE_SVE)) { - vq = (env->vfp.zcr_el[1] & 0xf) + 1; - sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16); - if (!sve && size == sve_size) { - sve = (struct target_sve_context *)ctx; - break; - } - } - err = true; - goto exit; - - case TARGET_EXTRA_MAGIC: - if (extra || size != sizeof(struct target_extra_context)) { - err = true; - goto exit; - } - __get_user(extra_datap, - &((struct target_extra_context *)ctx)->datap); - __get_user(extra_size, - &((struct target_extra_context *)ctx)->size); - extra = lock_user(VERIFY_READ, extra_datap, extra_size, 0); - break; - - default: - /* Unknown record -- we certainly didn't generate it. - * Did we in fact get out of sync? - */ - err = true; - goto exit; - } - ctx = (void *)ctx + size; - } - - /* Require FPSIMD always. */ - if (fpsimd) { - target_restore_fpsimd_record(env, fpsimd); - } else { - err = true; - } - - /* SVE data, if present, overwrites FPSIMD data. */ - if (sve) { - target_restore_sve_record(env, sve, vq); - } - - exit: - unlock_user(extra, extra_datap, 0); - return err; -} - -static abi_ulong get_sigframe(struct target_sigaction *ka, - CPUARMState *env, int size) -{ - abi_ulong sp; - - sp = env->xregs[31]; - - /* - * This is the X/Open sanctioned signal stack switching. - */ - if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { - sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; - } - - sp = (sp - size) & ~15; - - return sp; -} - -typedef struct { - int total_size; - int extra_base; - int extra_size; - int std_end_ofs; - int extra_ofs; - int extra_end_ofs; -} target_sigframe_layout; - -static int alloc_sigframe_space(int this_size, target_sigframe_layout *l) -{ - /* Make sure there will always be space for the end marker. */ - const int std_size = sizeof(struct target_rt_sigframe) - - sizeof(struct target_aarch64_ctx); - int this_loc = l->total_size; - - if (l->extra_base) { - /* Once we have begun an extra space, all allocations go there. */ - l->extra_size += this_size; - } else if (this_size + this_loc > std_size) { - /* This allocation does not fit in the standard space. */ - /* Allocate the extra record. */ - l->extra_ofs = this_loc; - l->total_size += sizeof(struct target_extra_context); - - /* Allocate the standard end record. */ - l->std_end_ofs = l->total_size; - l->total_size += sizeof(struct target_aarch64_ctx); - - /* Allocate the requested record. */ - l->extra_base = this_loc = l->total_size; - l->extra_size = this_size; - } - l->total_size += this_size; - - return this_loc; -} - -static void target_setup_frame(int usig, struct target_sigaction *ka, - target_siginfo_t *info, target_sigset_t *set, - CPUARMState *env) -{ - target_sigframe_layout layout = { - /* Begin with the size pointing to the reserved space. */ - .total_size = offsetof(struct target_rt_sigframe, - uc.tuc_mcontext.__reserved), - }; - int fpsimd_ofs, fr_ofs, sve_ofs = 0, vq = 0, sve_size = 0; - struct target_rt_sigframe *frame; - struct target_rt_frame_record *fr; - abi_ulong frame_addr, return_addr; - - /* FPSIMD record is always in the standard space. */ - fpsimd_ofs = alloc_sigframe_space(sizeof(struct target_fpsimd_context), - &layout); - - /* SVE state needs saving only if it exists. */ - if (arm_feature(env, ARM_FEATURE_SVE)) { - vq = (env->vfp.zcr_el[1] & 0xf) + 1; - sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16); - sve_ofs = alloc_sigframe_space(sve_size, &layout); - } - - if (layout.extra_ofs) { - /* Reserve space for the extra end marker. The standard end marker - * will have been allocated when we allocated the extra record. - */ - layout.extra_end_ofs - = alloc_sigframe_space(sizeof(struct target_aarch64_ctx), &layout); - } else { - /* Reserve space for the standard end marker. - * Do not use alloc_sigframe_space because we cheat - * std_size therein to reserve space for this. - */ - layout.std_end_ofs = layout.total_size; - layout.total_size += sizeof(struct target_aarch64_ctx); - } - - /* We must always provide at least the standard 4K reserved space, - * even if we don't use all of it (this is part of the ABI) - */ - layout.total_size = MAX(layout.total_size, - sizeof(struct target_rt_sigframe)); - - /* Reserve space for the return code. On a real system this would - * be within the VDSO. So, despite the name this is not a "real" - * record within the frame. - */ - fr_ofs = layout.total_size; - layout.total_size += sizeof(struct target_rt_frame_record); - - frame_addr = get_sigframe(ka, env, layout.total_size); - trace_user_setup_frame(env, frame_addr); - frame = lock_user(VERIFY_WRITE, frame_addr, layout.total_size, 0); - if (!frame) { - goto give_sigsegv; - } - - target_setup_general_frame(frame, env, set); - target_setup_fpsimd_record((void *)frame + fpsimd_ofs, env); - target_setup_end_record((void *)frame + layout.std_end_ofs); - if (layout.extra_ofs) { - target_setup_extra_record((void *)frame + layout.extra_ofs, - frame_addr + layout.extra_base, - layout.extra_size); - target_setup_end_record((void *)frame + layout.extra_end_ofs); - } - if (sve_ofs) { - target_setup_sve_record((void *)frame + sve_ofs, env, vq, sve_size); - } - - /* Set up the stack frame for unwinding. */ - fr = (void *)frame + fr_ofs; - __put_user(env->xregs[29], &fr->fp); - __put_user(env->xregs[30], &fr->lr); - - if (ka->sa_flags & TARGET_SA_RESTORER) { - return_addr = ka->sa_restorer; - } else { - /* - * mov x8,#__NR_rt_sigreturn; svc #0 - * Since these are instructions they need to be put as little-endian - * regardless of target default or current CPU endianness. - */ - __put_user_e(0xd2801168, &fr->tramp[0], le); - __put_user_e(0xd4000001, &fr->tramp[1], le); - return_addr = frame_addr + fr_ofs - + offsetof(struct target_rt_frame_record, tramp); - } - env->xregs[0] = usig; - env->xregs[31] = frame_addr; - env->xregs[29] = frame_addr + fr_ofs; - env->pc = ka->_sa_handler; - env->xregs[30] = return_addr; - if (info) { - tswap_siginfo(&frame->info, info); - env->xregs[1] = frame_addr + offsetof(struct target_rt_sigframe, info); - env->xregs[2] = frame_addr + offsetof(struct target_rt_sigframe, uc); - } - - unlock_user(frame, frame_addr, layout.total_size); - return; - - give_sigsegv: - unlock_user(frame, frame_addr, layout.total_size); - force_sigsegv(usig); -} - -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 = NULL; - abi_ulong frame_addr = env->xregs[31]; - - trace_user_do_rt_sigreturn(env, frame_addr); - 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 -TARGET_QEMU_ESIGRETURN; - - badframe: - unlock_user_struct(frame, frame_addr, 0); - force_sig(TARGET_SIGSEGV); - return -TARGET_QEMU_ESIGRETURN; -} - -long do_sigreturn(CPUARMState *env) -{ - return do_rt_sigreturn(env); -} - -#elif defined(TARGET_ARM) +#elif defined(TARGET_ARM) && !defined(TARGET_AARCH64) struct target_sigcontext { abi_ulong trap_no; |