| /* |
| * 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 "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); |
| } |
| } |
