From 43fff2384e7027f1c870520dbb111e0b2df8b4bb Mon Sep 17 00:00:00 2001 From: bellard Date: Wed, 9 Jul 2003 19:31:39 +0000 Subject: [PATCH] ARM signal support git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@318 c046a42c-6fe2-441c-8c8c-71466251a162 --- linux-user/main.c | 5 +- linux-user/signal.c | 483 ++++++++++++++++++++++++++++++++++++++++---- syscall-arm.h | 1 + 3 files changed, 449 insertions(+), 40 deletions(-) diff --git a/linux-user/main.c b/linux-user/main.c index 56cba61898..2f341d92c9 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -246,8 +246,6 @@ void cpu_loop(CPUX86State *env) #ifdef TARGET_ARM -#define ARM_SYSCALL_BASE 0x900000 - void cpu_loop(CPUARMState *env) { int trapnr; @@ -285,6 +283,9 @@ void cpu_loop(CPUARMState *env) } } break; + case EXCP_INTERRUPT: + /* just indicate that signals should be handled asap */ + break; default: error: fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n", diff --git a/linux-user/signal.c b/linux-user/signal.c index 74aaeea681..18cf5e242c 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -364,6 +364,80 @@ int do_sigaction(int sig, const struct target_sigaction *act, return 0; } +#define __put_user(x,ptr)\ +({\ + int size = sizeof(*ptr);\ + switch(size) {\ + case 1:\ + stb(ptr, (typeof(*ptr))(x));\ + break;\ + case 2:\ + stw(ptr, (typeof(*ptr))(x));\ + break;\ + case 4:\ + stl(ptr, (typeof(*ptr))(x));\ + break;\ + case 8:\ + stq(ptr, (typeof(*ptr))(x));\ + break;\ + default:\ + abort();\ + }\ + 0;\ +}) + +#define __get_user(x, ptr) \ +({\ + int size = sizeof(*ptr);\ + switch(size) {\ + case 1:\ + x = (typeof(*ptr))ldub(ptr);\ + break;\ + case 2:\ + x = (typeof(*ptr))lduw(ptr);\ + break;\ + case 4:\ + x = (typeof(*ptr))ldl(ptr);\ + break;\ + case 8:\ + x = (typeof(*ptr))ldq(ptr);\ + break;\ + default:\ + abort();\ + }\ + 0;\ +}) + + +#define __copy_to_user(dst, src, size)\ +({\ + memcpy(dst, src, size);\ + 0;\ +}) + +#define __copy_from_user(dst, src, size)\ +({\ + memcpy(dst, src, size);\ + 0;\ +}) + +#define __clear_user(dst, size)\ +({\ + memset(dst, 0, size);\ + 0;\ +}) + +#ifndef offsetof +#define offsetof(type, field) ((size_t) &((type *)0)->field) +#endif + +static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, + const target_siginfo_t *info) +{ + tswap_siginfo(tinfo, info); + return 0; +} + #ifdef TARGET_I386 /* from the Linux kernel */ @@ -472,44 +546,6 @@ struct rt_sigframe * Set up a signal frame. */ -#define __put_user(x,ptr)\ -({\ - int size = sizeof(*ptr);\ - switch(size) {\ - case 1:\ - stb(ptr, (typeof(*ptr))(x));\ - break;\ - case 2:\ - stw(ptr, (typeof(*ptr))(x));\ - break;\ - case 4:\ - stl(ptr, (typeof(*ptr))(x));\ - break;\ - case 8:\ - stq(ptr, (typeof(*ptr))(x));\ - break;\ - default:\ - abort();\ - }\ - 0;\ -}) - -#define get_user(val, ptr) (typeof(*ptr))(*(ptr)) - - -#define __copy_to_user(dst, src, size)\ -({\ - memcpy(dst, src, size);\ - 0;\ -}) - -static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, - const target_siginfo_t *info) -{ - tswap_siginfo(tinfo, info); - return 0; -} - /* XXX: save x87 state */ static int setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, @@ -825,6 +861,377 @@ badframe: return 0; } +#elif defined(TARGET_ARM) + +struct target_sigcontext { + target_ulong trap_no; + target_ulong error_code; + target_ulong oldmask; + target_ulong arm_r0; + target_ulong arm_r1; + target_ulong arm_r2; + target_ulong arm_r3; + target_ulong arm_r4; + target_ulong arm_r5; + target_ulong arm_r6; + target_ulong arm_r7; + target_ulong arm_r8; + target_ulong arm_r9; + target_ulong arm_r10; + target_ulong arm_fp; + target_ulong arm_ip; + target_ulong arm_sp; + target_ulong arm_lr; + target_ulong arm_pc; + target_ulong arm_cpsr; + target_ulong fault_address; +}; + +typedef struct target_sigaltstack { + target_ulong ss_sp; + int ss_flags; + target_ulong ss_size; +} target_stack_t; + +struct target_ucontext { + target_ulong uc_flags; + target_ulong uc_link; + target_stack_t uc_stack; + struct target_sigcontext uc_mcontext; + target_sigset_t uc_sigmask; /* mask last for extensibility */ +}; + +struct sigframe +{ + struct target_sigcontext sc; + target_ulong extramask[TARGET_NSIG_WORDS-1]; + target_ulong retcode; +}; + +struct rt_sigframe +{ + struct target_siginfo *pinfo; + void *puc; + struct target_siginfo info; + struct target_ucontext uc; + target_ulong retcode; +}; + +#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 target_ulong retcodes[4] = { + SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, + SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN +}; + + +#define __put_user_error(x,p,e) __put_user(x, p) +#define __get_user_error(x,p,e) __get_user(x, p) + +static inline int valid_user_regs(CPUState *regs) +{ + return 1; +} + +static int +setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ + CPUState *env, unsigned long mask) +{ + int err = 0; + + __put_user_error(env->regs[0], &sc->arm_r0, err); + __put_user_error(env->regs[1], &sc->arm_r1, err); + __put_user_error(env->regs[2], &sc->arm_r2, err); + __put_user_error(env->regs[3], &sc->arm_r3, err); + __put_user_error(env->regs[4], &sc->arm_r4, err); + __put_user_error(env->regs[5], &sc->arm_r5, err); + __put_user_error(env->regs[6], &sc->arm_r6, err); + __put_user_error(env->regs[7], &sc->arm_r7, err); + __put_user_error(env->regs[8], &sc->arm_r8, err); + __put_user_error(env->regs[9], &sc->arm_r9, err); + __put_user_error(env->regs[10], &sc->arm_r10, err); + __put_user_error(env->regs[11], &sc->arm_fp, err); + __put_user_error(env->regs[12], &sc->arm_ip, err); + __put_user_error(env->regs[13], &sc->arm_sp, err); + __put_user_error(env->regs[14], &sc->arm_lr, err); + __put_user_error(env->regs[15], &sc->arm_pc, err); +#ifdef TARGET_CONFIG_CPU_32 + __put_user_error(env->cpsr, &sc->arm_cpsr, err); +#endif + + __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err); + __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err); + __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err); + __put_user_error(mask, &sc->oldmask, err); + + return err; +} + +static inline void * +get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize) +{ + unsigned long sp = regs->regs[13]; + +#if 0 + /* + * This is the X/Open sanctioned signal stack switching. + */ + if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) + sp = current->sas_ss_sp + current->sas_ss_size; +#endif + /* + * ATPCS B01 mandates 8-byte alignment + */ + return (void *)((sp - framesize) & ~7); +} + +static int +setup_return(CPUState *env, struct emulated_sigaction *ka, + target_ulong *rc, void *frame, int usig) +{ + target_ulong handler = (target_ulong)ka->sa._sa_handler; + target_ulong retcode; + int thumb = 0; +#if defined(TARGET_CONFIG_CPU_32) + target_ulong cpsr = env->cpsr; + +#if 0 + /* + * Maybe we need to deliver a 32-bit signal to a 26-bit task. + */ + if (ka->sa.sa_flags & SA_THIRTYTWO) + cpsr = (cpsr & ~MODE_MASK) | USR_MODE; + +#ifdef CONFIG_ARM_THUMB + if (elf_hwcap & HWCAP_THUMB) { + /* + * The LSB of the handler determines if we're going to + * be using THUMB or ARM mode for this signal handler. + */ + thumb = handler & 1; + + if (thumb) + cpsr |= T_BIT; + else + cpsr &= ~T_BIT; + } +#endif +#endif +#endif /* TARGET_CONFIG_CPU_32 */ + + if (ka->sa.sa_flags & TARGET_SA_RESTORER) { + retcode = (target_ulong)ka->sa.sa_restorer; + } else { + unsigned int idx = thumb; + + if (ka->sa.sa_flags & TARGET_SA_SIGINFO) + idx += 2; + + if (__put_user(retcodes[idx], rc)) + return 1; +#if 0 + flush_icache_range((target_ulong)rc, + (target_ulong)(rc + 1)); +#endif + retcode = ((target_ulong)rc) + thumb; + } + + env->regs[0] = usig; + env->regs[13] = (target_ulong)frame; + env->regs[14] = retcode; + env->regs[15] = handler & (thumb ? ~1 : ~3); + +#ifdef TARGET_CONFIG_CPU_32 + env->cpsr = cpsr; +#endif + + return 0; +} + +static void setup_frame(int usig, struct emulated_sigaction *ka, + target_sigset_t *set, CPUState *regs) +{ + struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame)); + int err = 0; + + err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]); + + if (TARGET_NSIG_WORDS > 1) { + err |= __copy_to_user(frame->extramask, &set->sig[1], + sizeof(frame->extramask)); + } + + if (err == 0) + err = setup_return(regs, ka, &frame->retcode, frame, usig); + // return err; +} + +static void setup_rt_frame(int usig, struct emulated_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUState *env) +{ + struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame)); + int err = 0; + +#if 0 + if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) + return 1; +#endif + __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err); + __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err); + err |= copy_siginfo_to_user(&frame->info, info); + + /* Clear all the bits of the ucontext we don't use. */ + err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext)); + + err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/ + env, set->sig[0]); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + + if (err == 0) + err = setup_return(env, ka, &frame->retcode, frame, usig); + + if (err == 0) { + /* + * For realtime signals we must also set the second and third + * arguments for the signal handler. + * -- Peter Maydell 2000-12-06 + */ + env->regs[1] = (target_ulong)frame->pinfo; + env->regs[2] = (target_ulong)frame->puc; + } + + // return err; +} + +static int +restore_sigcontext(CPUState *env, struct target_sigcontext *sc) +{ + int err = 0; + + __get_user_error(env->regs[0], &sc->arm_r0, err); + __get_user_error(env->regs[1], &sc->arm_r1, err); + __get_user_error(env->regs[2], &sc->arm_r2, err); + __get_user_error(env->regs[3], &sc->arm_r3, err); + __get_user_error(env->regs[4], &sc->arm_r4, err); + __get_user_error(env->regs[5], &sc->arm_r5, err); + __get_user_error(env->regs[6], &sc->arm_r6, err); + __get_user_error(env->regs[7], &sc->arm_r7, err); + __get_user_error(env->regs[8], &sc->arm_r8, err); + __get_user_error(env->regs[9], &sc->arm_r9, err); + __get_user_error(env->regs[10], &sc->arm_r10, err); + __get_user_error(env->regs[11], &sc->arm_fp, err); + __get_user_error(env->regs[12], &sc->arm_ip, err); + __get_user_error(env->regs[13], &sc->arm_sp, err); + __get_user_error(env->regs[14], &sc->arm_lr, err); + __get_user_error(env->regs[15], &sc->arm_pc, err); +#ifdef TARGET_CONFIG_CPU_32 + __get_user_error(env->cpsr, &sc->arm_cpsr, err); +#endif + + err |= !valid_user_regs(env); + + return err; +} + +long do_sigreturn(CPUState *env) +{ + struct sigframe *frame; + target_sigset_t set; + 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. + */ + if (env->regs[13] & 7) + goto badframe; + + frame = (struct sigframe *)env->regs[13]; + +#if 0 + if (verify_area(VERIFY_READ, frame, sizeof (*frame))) + goto badframe; +#endif + if (__get_user(set.sig[0], &frame->sc.oldmask) + || (TARGET_NSIG_WORDS > 1 + && __copy_from_user(&set.sig[1], &frame->extramask, + sizeof(frame->extramask)))) + goto badframe; + + target_to_host_sigset(&host_set, &set); + sigprocmask(SIG_SETMASK, &host_set, NULL); + + 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 + return env->regs[0]; + +badframe: + force_sig(SIGSEGV /* , current */); + return 0; +} + +long do_rt_sigreturn(CPUState *env) +{ + struct rt_sigframe *frame; + target_sigset_t set; + 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. + */ + if (env->regs[13] & 7) + goto badframe; + + frame = (struct rt_sigframe *)env->regs[13]; + +#if 0 + if (verify_area(VERIFY_READ, frame, sizeof (*frame))) + goto badframe; +#endif + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) + goto badframe; + + target_to_host_sigset(&host_set, &set); + sigprocmask(SIG_SETMASK, &host_set, NULL); + + if (restore_sigcontext(env, &frame->uc.uc_mcontext)) + goto badframe; + +#if 0 + /* Send SIGTRAP if we're single-stepping */ + if (ptrace_cancel_bpt(current)) + send_sig(SIGTRAP, current, 1); +#endif + return env->regs[0]; + +badframe: + force_sig(SIGSEGV /* , current */); + return 0; +} + #else static void setup_frame(int sig, struct emulated_sigaction *ka, diff --git a/syscall-arm.h b/syscall-arm.h index e5977106bd..34153c998d 100644 --- a/syscall-arm.h +++ b/syscall-arm.h @@ -25,3 +25,4 @@ struct target_pt_regs { #define ARM_r0 uregs[0] #define ARM_ORIG_r0 uregs[17] +#define ARM_SYSCALL_BASE 0x900000 -- GitLab