| /* |
| * linux/arch/parisc/kernel/signal.c: Architecture-specific signal |
| * handling support. |
| * |
| * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> |
| * Copyright (C) 2000 Linuxcare, Inc. |
| * |
| * Based on the ia64, i386, and alpha versions. |
| * |
| * Like the IA-64, we are a recent enough port (we are *starting* |
| * with glibc2.2) that we do not need to support the old non-realtime |
| * Linux signals. Therefore we don't. HP/UX signals will go in |
| * arch/parisc/hpux/signal.c when we figure out how to do them. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/smp.h> |
| #include <linux/smp_lock.h> |
| #include <linux/kernel.h> |
| #include <linux/signal.h> |
| #include <linux/errno.h> |
| #include <linux/wait.h> |
| #include <linux/ptrace.h> |
| #include <linux/unistd.h> |
| #include <linux/stddef.h> |
| #include <linux/compat.h> |
| #include <linux/elf.h> |
| #include <linux/personality.h> |
| #include <asm/ucontext.h> |
| #include <asm/rt_sigframe.h> |
| #include <asm/uaccess.h> |
| #include <asm/pgalloc.h> |
| #include <asm/cacheflush.h> |
| #include <asm/asm-offsets.h> |
| |
| #ifdef CONFIG_COMPAT |
| #include <linux/compat.h> |
| #include "signal32.h" |
| #endif |
| |
| #define DEBUG_SIG 0 |
| #define DEBUG_SIG_LEVEL 2 |
| |
| #if DEBUG_SIG |
| #define DBG(LEVEL, ...) \ |
| ((DEBUG_SIG_LEVEL >= LEVEL) \ |
| ? printk(__VA_ARGS__) : (void) 0) |
| #else |
| #define DBG(LEVEL, ...) |
| #endif |
| |
| |
| #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| |
| /* gcc will complain if a pointer is cast to an integer of different |
| * size. If you really need to do this (and we do for an ELF32 user |
| * application in an ELF64 kernel) then you have to do a cast to an |
| * integer of the same size first. The A() macro accomplishes |
| * this. */ |
| #define A(__x) ((unsigned long)(__x)) |
| |
| int do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall); |
| |
| /* |
| * Atomically swap in the new signal mask, and wait for a signal. |
| */ |
| #ifdef __LP64__ |
| #include "sys32.h" |
| #endif |
| |
| asmlinkage int |
| sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs) |
| { |
| sigset_t saveset, newset; |
| #ifdef __LP64__ |
| compat_sigset_t newset32; |
| |
| if(personality(current->personality) == PER_LINUX32){ |
| /* XXX: Don't preclude handling different sized sigset_t's. */ |
| if (sigsetsize != sizeof(compat_sigset_t)) |
| return -EINVAL; |
| if (copy_from_user(&newset32, (compat_sigset_t __user *)unewset, sizeof(newset32))) |
| return -EFAULT; |
| sigset_32to64(&newset,&newset32); |
| |
| } else |
| #endif |
| { |
| /* XXX: Don't preclude handling different sized sigset_t's. */ |
| if (sigsetsize != sizeof(sigset_t)) |
| return -EINVAL; |
| |
| if (copy_from_user(&newset, unewset, sizeof(newset))) |
| return -EFAULT; |
| } |
| |
| sigdelsetmask(&newset, ~_BLOCKABLE); |
| |
| spin_lock_irq(¤t->sighand->siglock); |
| saveset = current->blocked; |
| current->blocked = newset; |
| recalc_sigpending(); |
| spin_unlock_irq(¤t->sighand->siglock); |
| |
| regs->gr[28] = -EINTR; |
| while (1) { |
| current->state = TASK_INTERRUPTIBLE; |
| schedule(); |
| if (do_signal(&saveset, regs, 1)) |
| return -EINTR; |
| } |
| } |
| |
| /* |
| * Do a signal return - restore sigcontext. |
| */ |
| |
| /* Trampoline for calling rt_sigreturn() */ |
| #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ |
| #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ |
| #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ |
| #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ |
| #define INSN_NOP 0x08000240 /* nop */ |
| /* For debugging */ |
| #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ |
| |
| static long |
| restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) |
| { |
| long err = 0; |
| |
| err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); |
| err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); |
| err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); |
| err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); |
| err |= __get_user(regs->sar, &sc->sc_sar); |
| DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n", |
| regs->iaoq[0],regs->iaoq[1]); |
| DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); |
| return err; |
| } |
| |
| void |
| sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) |
| { |
| struct rt_sigframe __user *frame; |
| struct siginfo si; |
| sigset_t set; |
| unsigned long usp = (regs->gr[30] & ~(0x01UL)); |
| unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
| #ifdef __LP64__ |
| compat_sigset_t compat_set; |
| struct compat_rt_sigframe __user * compat_frame; |
| |
| if(personality(current->personality) == PER_LINUX32) |
| sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| #endif |
| |
| |
| /* Unwind the user stack to get the rt_sigframe structure. */ |
| frame = (struct rt_sigframe __user *) |
| (usp - sigframe_size); |
| DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); |
| |
| #ifdef __LP64__ |
| compat_frame = (struct compat_rt_sigframe __user *)frame; |
| |
| if(personality(current->personality) == PER_LINUX32){ |
| DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); |
| if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) |
| goto give_sigsegv; |
| sigset_32to64(&set,&compat_set); |
| } else |
| #endif |
| { |
| if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| goto give_sigsegv; |
| } |
| |
| sigdelsetmask(&set, ~_BLOCKABLE); |
| spin_lock_irq(¤t->sighand->siglock); |
| current->blocked = set; |
| recalc_sigpending(); |
| spin_unlock_irq(¤t->sighand->siglock); |
| |
| /* Good thing we saved the old gr[30], eh? */ |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX32){ |
| DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", |
| &compat_frame->uc.uc_mcontext); |
| // FIXME: Load upper half from register file |
| if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, |
| &compat_frame->regs, regs)) |
| goto give_sigsegv; |
| DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| usp, &compat_frame->uc.uc_stack); |
| if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT) |
| goto give_sigsegv; |
| } else |
| #endif |
| { |
| DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", |
| &frame->uc.uc_mcontext); |
| if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) |
| goto give_sigsegv; |
| DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| usp, &frame->uc.uc_stack); |
| if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) |
| goto give_sigsegv; |
| } |
| |
| |
| |
| /* If we are on the syscall path IAOQ will not be restored, and |
| * if we are on the interrupt path we must not corrupt gr31. |
| */ |
| if (in_syscall) |
| regs->gr[31] = regs->iaoq[0]; |
| #if DEBUG_SIG |
| DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); |
| show_regs(regs); |
| #endif |
| return; |
| |
| give_sigsegv: |
| DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); |
| si.si_signo = SIGSEGV; |
| si.si_errno = 0; |
| si.si_code = SI_KERNEL; |
| si.si_pid = current->pid; |
| si.si_uid = current->uid; |
| si.si_addr = &frame->uc; |
| force_sig_info(SIGSEGV, &si, current); |
| return; |
| } |
| |
| /* |
| * Set up a signal frame. |
| */ |
| |
| static inline void __user * |
| get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| { |
| /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we |
| don't use the parameter it doesn't matter */ |
| |
| DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", |
| (unsigned long)ka, sp, frame_size); |
| |
| if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) |
| sp = current->sas_ss_sp; /* Stacks grow up! */ |
| |
| DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); |
| return (void __user *) sp; /* Stacks grow up. Fun. */ |
| } |
| |
| static long |
| setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) |
| |
| { |
| unsigned long flags = 0; |
| long err = 0; |
| |
| if (on_sig_stack((unsigned long) sc)) |
| flags |= PARISC_SC_FLAG_ONSTACK; |
| if (in_syscall) { |
| flags |= PARISC_SC_FLAG_IN_SYSCALL; |
| /* regs->iaoq is undefined in the syscall return path */ |
| err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); |
| err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); |
| err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); |
| err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); |
| DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", |
| regs->gr[31], regs->gr[31]+4); |
| } else { |
| err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); |
| err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); |
| DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", |
| regs->iaoq[0], regs->iaoq[1]); |
| } |
| |
| err |= __put_user(flags, &sc->sc_flags); |
| err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); |
| err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); |
| err |= __put_user(regs->sar, &sc->sc_sar); |
| DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); |
| |
| return err; |
| } |
| |
| static long |
| setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| sigset_t *set, struct pt_regs *regs, int in_syscall) |
| { |
| struct rt_sigframe __user *frame; |
| unsigned long rp, usp; |
| unsigned long haddr, sigframe_size; |
| struct siginfo si; |
| int err = 0; |
| #ifdef __LP64__ |
| compat_int_t compat_val; |
| struct compat_rt_sigframe __user * compat_frame; |
| compat_sigset_t compat_set; |
| #endif |
| |
| usp = (regs->gr[30] & ~(0x01UL)); |
| /*FIXME: frame_size parameter is unused, remove it. */ |
| frame = get_sigframe(ka, usp, sizeof(*frame)); |
| |
| DBG(1,"SETUP_RT_FRAME: START\n"); |
| DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); |
| |
| |
| #ifdef __LP64__ |
| |
| compat_frame = (struct compat_rt_sigframe __user *)frame; |
| |
| if(personality(current->personality) == PER_LINUX32) { |
| DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); |
| err |= compat_copy_siginfo_to_user(&compat_frame->info, info); |
| DBG(1,"SETUP_RT_FRAME: 1\n"); |
| compat_val = (compat_int_t)current->sas_ss_sp; |
| err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp); |
| DBG(1,"SETUP_RT_FRAME: 2\n"); |
| compat_val = (compat_int_t)current->sas_ss_size; |
| err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size); |
| DBG(1,"SETUP_RT_FRAME: 3\n"); |
| compat_val = sas_ss_flags(regs->gr[30]); |
| err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags); |
| DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); |
| DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); |
| err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, |
| &compat_frame->regs, regs, in_syscall); |
| sigset_64to32(&compat_set,set); |
| err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); |
| } else |
| #endif |
| { |
| DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); |
| err |= copy_siginfo_to_user(&frame->info, info); |
| err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| err |= __put_user(sas_ss_flags(regs->gr[30]), |
| &frame->uc.uc_stack.ss_flags); |
| DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); |
| DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); |
| err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); |
| /* FIXME: Should probably be converted aswell for the compat case */ |
| err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| } |
| |
| if (err) |
| goto give_sigsegv; |
| |
| /* Set up to return from userspace. If provided, use a stub |
| already in userspace. The first words of tramp are used to |
| save the previous sigrestartblock trampoline that might be |
| on the stack. We start the sigreturn trampoline at |
| SIGRESTARTBLOCK_TRAMP+X. */ |
| err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, |
| &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); |
| err |= __put_user(INSN_LDI_R20, |
| &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); |
| err |= __put_user(INSN_BLE_SR2_R0, |
| &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); |
| err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); |
| |
| #if DEBUG_SIG |
| /* Assert that we're flushing in the correct space... */ |
| { |
| int sid; |
| asm ("mfsp %%sr3,%0" : "=r" (sid)); |
| DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", |
| sid, frame->tramp); |
| } |
| #endif |
| |
| flush_user_dcache_range((unsigned long) &frame->tramp[0], |
| (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| flush_user_icache_range((unsigned long) &frame->tramp[0], |
| (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| |
| /* TRAMP Words 0-4, Lenght 5 = SIGRESTARTBLOCK_TRAMP |
| * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP |
| * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP |
| */ |
| rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; |
| |
| if (err) |
| goto give_sigsegv; |
| |
| haddr = A(ka->sa.sa_handler); |
| /* The sa_handler may be a pointer to a function descriptor */ |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX32) { |
| #endif |
| if (haddr & PA_PLABEL_FDESC) { |
| Elf32_Fdesc fdesc; |
| Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); |
| |
| err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| |
| if (err) |
| goto give_sigsegv; |
| |
| haddr = fdesc.addr; |
| regs->gr[19] = fdesc.gp; |
| } |
| #ifdef __LP64__ |
| } else { |
| Elf64_Fdesc fdesc; |
| Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); |
| |
| err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| |
| if (err) |
| goto give_sigsegv; |
| |
| haddr = fdesc.addr; |
| regs->gr[19] = fdesc.gp; |
| DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", |
| haddr, regs->gr[19], in_syscall); |
| } |
| #endif |
| |
| /* The syscall return path will create IAOQ values from r31. |
| */ |
| sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX32) |
| sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| #endif |
| if (in_syscall) { |
| regs->gr[31] = haddr; |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX) |
| sigframe_size |= 1; |
| #endif |
| } else { |
| unsigned long psw = USER_PSW; |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX) |
| psw |= PSW_W; |
| #endif |
| |
| /* If we are singlestepping, arrange a trap to be delivered |
| when we return to userspace. Note the semantics -- we |
| should trap before the first insn in the handler is |
| executed. Ref: |
| http://sources.redhat.com/ml/gdb/2004-11/msg00245.html |
| */ |
| if (pa_psw(current)->r) { |
| pa_psw(current)->r = 0; |
| psw |= PSW_R; |
| mtctl(-1, 0); |
| } |
| |
| regs->gr[0] = psw; |
| regs->iaoq[0] = haddr | 3; |
| regs->iaoq[1] = regs->iaoq[0] + 4; |
| } |
| |
| regs->gr[2] = rp; /* userland return pointer */ |
| regs->gr[26] = sig; /* signal number */ |
| |
| #ifdef __LP64__ |
| if(personality(current->personality) == PER_LINUX32){ |
| regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ |
| regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ |
| } else |
| #endif |
| { |
| regs->gr[25] = A(&frame->info); /* siginfo pointer */ |
| regs->gr[24] = A(&frame->uc); /* ucontext pointer */ |
| } |
| |
| DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", |
| regs->gr[30], sigframe_size, |
| regs->gr[30] + sigframe_size); |
| /* Raise the user stack pointer to make a proper call frame. */ |
| regs->gr[30] = (A(frame) + sigframe_size); |
| |
| |
| DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", |
| current->comm, current->pid, frame, regs->gr[30], |
| regs->iaoq[0], regs->iaoq[1], rp); |
| |
| return 1; |
| |
| give_sigsegv: |
| DBG(1,"setup_rt_frame: sending SIGSEGV\n"); |
| force_sigsegv(sig, current); |
| return 0; |
| } |
| |
| /* |
| * OK, we're invoking a handler. |
| */ |
| |
| static long |
| handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
| sigset_t *oldset, struct pt_regs *regs, int in_syscall) |
| { |
| DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", |
| sig, ka, info, oldset, regs); |
| |
| /* Set up the stack frame */ |
| if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall)) |
| return 0; |
| |
| spin_lock_irq(¤t->sighand->siglock); |
| sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| if (!(ka->sa.sa_flags & SA_NODEFER)) |
| sigaddset(¤t->blocked,sig); |
| recalc_sigpending(); |
| spin_unlock_irq(¤t->sighand->siglock); |
| return 1; |
| } |
| |
| /* |
| * Note that 'init' is a special process: it doesn't get signals it doesn't |
| * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| * mistake. |
| * |
| * We need to be able to restore the syscall arguments (r21-r26) to |
| * restart syscalls. Thus, the syscall path should save them in the |
| * pt_regs structure (it's okay to do so since they are caller-save |
| * registers). As noted below, the syscall number gets restored for |
| * us due to the magic of delayed branching. |
| */ |
| |
| asmlinkage int |
| do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall) |
| { |
| siginfo_t info; |
| struct k_sigaction ka; |
| int signr; |
| |
| DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n", |
| oldset, regs, regs->sr[7], in_syscall); |
| |
| /* Everyone else checks to see if they are in kernel mode at |
| this point and exits if that's the case. I'm not sure why |
| we would be called in that case, but for some reason we |
| are. */ |
| |
| if (!oldset) |
| oldset = ¤t->blocked; |
| |
| DBG(1,"do_signal: oldset %08lx / %08lx\n", |
| oldset->sig[0], oldset->sig[1]); |
| |
| |
| /* May need to force signal if handle_signal failed to deliver */ |
| while (1) { |
| |
| signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); |
| |
| if (signr <= 0) |
| break; |
| |
| /* Restart a system call if necessary. */ |
| if (in_syscall) { |
| /* Check the return code */ |
| switch (regs->gr[28]) { |
| case -ERESTART_RESTARTBLOCK: |
| current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| case -ERESTARTNOHAND: |
| DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); |
| regs->gr[28] = -EINTR; |
| break; |
| |
| case -ERESTARTSYS: |
| if (!(ka.sa.sa_flags & SA_RESTART)) { |
| DBG(1,"ERESTARTSYS: putting -EINTR\n"); |
| regs->gr[28] = -EINTR; |
| break; |
| } |
| /* fallthrough */ |
| case -ERESTARTNOINTR: |
| /* A syscall is just a branch, so all |
| we have to do is fiddle the return pointer. */ |
| regs->gr[31] -= 8; /* delayed branching */ |
| /* Preserve original r28. */ |
| regs->gr[28] = regs->orig_r28; |
| break; |
| } |
| } |
| /* Whee! Actually deliver the signal. If the |
| delivery failed, we need to continue to iterate in |
| this loop so we can deliver the SIGSEGV... */ |
| if (handle_signal(signr, &info, &ka, oldset, regs, in_syscall)) { |
| DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", |
| regs->gr[28]); |
| return 1; |
| } |
| } |
| /* end of while(1) looping forever if we can't force a signal */ |
| |
| /* Did we come from a system call? */ |
| if (in_syscall) { |
| /* Restart the system call - no handlers present */ |
| if (regs->gr[28] == -ERESTART_RESTARTBLOCK) { |
| unsigned int *usp = (unsigned int *)regs->gr[30]; |
| |
| /* Setup a trampoline to restart the syscall |
| * with __NR_restart_syscall |
| * |
| * 0: <return address (orig r31)> |
| * 4: <2nd half for 64-bit> |
| * 8: ldw 0(%sp), %r31 |
| * 12: be 0x100(%sr2, %r0) |
| * 16: ldi __NR_restart_syscall, %r20 |
| */ |
| #ifndef __LP64__ |
| put_user(regs->gr[31], &usp[0]); |
| put_user(0x0fc0109f, &usp[2]); |
| #else |
| put_user(regs->gr[31] >> 32, &usp[0]); |
| put_user(regs->gr[31] & 0xffffffff, &usp[1]); |
| put_user(0x0fc010df, &usp[2]); |
| #endif |
| put_user(0xe0008200, &usp[3]); |
| put_user(0x34140000, &usp[4]); |
| |
| /* Stack is 64-byte aligned, and we only need |
| * to flush 1 cache line. |
| * Flushing one cacheline is cheap. |
| * "sync" on bigger (> 4 way) boxes is not. |
| */ |
| asm("fdc %%r0(%%sr3, %0)\n" |
| "sync\n" |
| "fic %%r0(%%sr3, %0)\n" |
| "sync\n" |
| : : "r"(regs->gr[30])); |
| |
| regs->gr[31] = regs->gr[30] + 8; |
| /* Preserve original r28. */ |
| regs->gr[28] = regs->orig_r28; |
| } else if (regs->gr[28] == -ERESTARTNOHAND || |
| regs->gr[28] == -ERESTARTSYS || |
| regs->gr[28] == -ERESTARTNOINTR) { |
| /* Hooray for delayed branching. We don't |
| have to restore %r20 (the system call |
| number) because it gets loaded in the delay |
| slot of the branch external instruction. */ |
| regs->gr[31] -= 8; |
| /* Preserve original r28. */ |
| regs->gr[28] = regs->orig_r28; |
| } |
| } |
| |
| DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", |
| regs->gr[28]); |
| |
| return 0; |
| } |