diff options
Diffstat (limited to 'arch/sparc/kernel/signal32.c')
| -rw-r--r-- | arch/sparc/kernel/signal32.c | 784 |
1 files changed, 784 insertions, 0 deletions
diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c new file mode 100644 index 000000000..dad38960d --- /dev/null +++ b/arch/sparc/kernel/signal32.c @@ -0,0 +1,784 @@ +// SPDX-License-Identifier: GPL-2.0 +/* arch/sparc64/kernel/signal32.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) + * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <linux/sched.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/mm.h> +#include <linux/tty.h> +#include <linux/binfmts.h> +#include <linux/compat.h> +#include <linux/bitops.h> + +#include <linux/uaccess.h> +#include <asm/ptrace.h> +#include <asm/psrcompat.h> +#include <asm/fpumacro.h> +#include <asm/visasm.h> +#include <asm/compat_signal.h> +#include <asm/switch_to.h> + +#include "sigutil.h" +#include "kernel.h" + +/* This magic should be in g_upper[0] for all upper parts + * to be valid. + */ +#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 +typedef struct { + unsigned int g_upper[8]; + unsigned int o_upper[8]; + unsigned int asi; +} siginfo_extra_v8plus_t; + +struct signal_frame32 { + struct sparc_stackf32 ss; + __siginfo32_t info; + /* __siginfo_fpu_t * */ u32 fpu_save; + unsigned int insns[2]; + unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; + unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ + /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ + siginfo_extra_v8plus_t v8plus; + /* __siginfo_rwin_t * */u32 rwin_save; +} __attribute__((aligned(8))); + +struct rt_signal_frame32 { + struct sparc_stackf32 ss; + compat_siginfo_t info; + struct pt_regs32 regs; + compat_sigset_t mask; + /* __siginfo_fpu_t * */ u32 fpu_save; + unsigned int insns[2]; + compat_stack_t stack; + unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ + /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ + siginfo_extra_v8plus_t v8plus; + /* __siginfo_rwin_t * */u32 rwin_save; +} __attribute__((aligned(8))); + +/* Checks if the fp is valid. We always build signal frames which are + * 16-byte aligned, therefore we can always enforce that the restore + * frame has that property as well. + */ +static bool invalid_frame_pointer(void __user *fp, int fplen) +{ + if ((((unsigned long) fp) & 15) || + ((unsigned long)fp) > 0x100000000ULL - fplen) + return true; + return false; +} + +void do_sigreturn32(struct pt_regs *regs) +{ + struct signal_frame32 __user *sf; + compat_uptr_t fpu_save; + compat_uptr_t rwin_save; + unsigned int psr, ufp; + unsigned int pc, npc; + sigset_t set; + compat_sigset_t seta; + int err, i; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + synchronize_user_stack(); + + regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; + sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; + + /* 1. Make sure we are not getting garbage from the user */ + if (invalid_frame_pointer(sf, sizeof(*sf))) + goto segv; + + if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) + goto segv; + + if (ufp & 0x7) + goto segv; + + if (__get_user(pc, &sf->info.si_regs.pc) || + __get_user(npc, &sf->info.si_regs.npc)) + goto segv; + + if ((pc | npc) & 3) + goto segv; + + if (test_thread_flag(TIF_32BIT)) { + pc &= 0xffffffff; + npc &= 0xffffffff; + } + regs->tpc = pc; + regs->tnpc = npc; + + /* 2. Restore the state */ + err = __get_user(regs->y, &sf->info.si_regs.y); + err |= __get_user(psr, &sf->info.si_regs.psr); + + for (i = UREG_G1; i <= UREG_I7; i++) + err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); + if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { + err |= __get_user(i, &sf->v8plus.g_upper[0]); + if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { + unsigned long asi; + + for (i = UREG_G1; i <= UREG_I7; i++) + err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); + err |= __get_user(asi, &sf->v8plus.asi); + regs->tstate &= ~TSTATE_ASI; + regs->tstate |= ((asi & 0xffUL) << 24UL); + } + } + + /* User can only change condition codes in %tstate. */ + regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); + regs->tstate |= psr_to_tstate_icc(psr); + + /* Prevent syscall restart. */ + pt_regs_clear_syscall(regs); + + err |= __get_user(fpu_save, &sf->fpu_save); + if (!err && fpu_save) + err |= restore_fpu_state(regs, compat_ptr(fpu_save)); + err |= __get_user(rwin_save, &sf->rwin_save); + if (!err && rwin_save) { + if (restore_rwin_state(compat_ptr(rwin_save))) + goto segv; + } + err |= __get_user(seta.sig[0], &sf->info.si_mask); + err |= copy_from_user(&seta.sig[1], &sf->extramask, + (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); + if (err) + goto segv; + + set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); + set_current_blocked(&set); + return; + +segv: + force_sig(SIGSEGV); +} + +asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) +{ + struct rt_signal_frame32 __user *sf; + unsigned int psr, pc, npc, ufp; + compat_uptr_t fpu_save; + compat_uptr_t rwin_save; + sigset_t set; + int err, i; + + /* Always make any pending restarted system calls return -EINTR */ + current->restart_block.fn = do_no_restart_syscall; + + synchronize_user_stack(); + regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; + sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; + + /* 1. Make sure we are not getting garbage from the user */ + if (invalid_frame_pointer(sf, sizeof(*sf))) + goto segv; + + if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) + goto segv; + + if (ufp & 0x7) + goto segv; + + if (__get_user(pc, &sf->regs.pc) || + __get_user(npc, &sf->regs.npc)) + goto segv; + + if ((pc | npc) & 3) + goto segv; + + if (test_thread_flag(TIF_32BIT)) { + pc &= 0xffffffff; + npc &= 0xffffffff; + } + regs->tpc = pc; + regs->tnpc = npc; + + /* 2. Restore the state */ + err = __get_user(regs->y, &sf->regs.y); + err |= __get_user(psr, &sf->regs.psr); + + for (i = UREG_G1; i <= UREG_I7; i++) + err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); + if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { + err |= __get_user(i, &sf->v8plus.g_upper[0]); + if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { + unsigned long asi; + + for (i = UREG_G1; i <= UREG_I7; i++) + err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); + err |= __get_user(asi, &sf->v8plus.asi); + regs->tstate &= ~TSTATE_ASI; + regs->tstate |= ((asi & 0xffUL) << 24UL); + } + } + + /* User can only change condition codes in %tstate. */ + regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); + regs->tstate |= psr_to_tstate_icc(psr); + + /* Prevent syscall restart. */ + pt_regs_clear_syscall(regs); + + err |= __get_user(fpu_save, &sf->fpu_save); + if (!err && fpu_save) + err |= restore_fpu_state(regs, compat_ptr(fpu_save)); + err |= get_compat_sigset(&set, &sf->mask); + err |= compat_restore_altstack(&sf->stack); + if (err) + goto segv; + + err |= __get_user(rwin_save, &sf->rwin_save); + if (!err && rwin_save) { + if (restore_rwin_state(compat_ptr(rwin_save))) + goto segv; + } + + set_current_blocked(&set); + return; +segv: + force_sig(SIGSEGV); +} + +static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) +{ + unsigned long sp; + + regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; + sp = regs->u_regs[UREG_FP]; + + /* + * If we are on the alternate signal stack and would overflow it, don't. + * Return an always-bogus address instead so we will die with SIGSEGV. + */ + if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) + return (void __user *) -1L; + + /* This is the X/Open sanctioned signal stack switching. */ + sp = sigsp(sp, ksig) - framesize; + + /* Always align the stack frame. This handles two cases. First, + * sigaltstack need not be mindful of platform specific stack + * alignment. Second, if we took this signal because the stack + * is not aligned properly, we'd like to take the signal cleanly + * and report that. + */ + sp &= ~15UL; + + return (void __user *) sp; +} + +/* The I-cache flush instruction only works in the primary ASI, which + * right now is the nucleus, aka. kernel space. + * + * Therefore we have to kick the instructions out using the kernel + * side linear mapping of the physical address backing the user + * instructions. + */ +static void flush_signal_insns(unsigned long address) +{ + unsigned long pstate, paddr; + pte_t *ptep, pte; + pgd_t *pgdp; + p4d_t *p4dp; + pud_t *pudp; + pmd_t *pmdp; + + /* Commit all stores of the instructions we are about to flush. */ + wmb(); + + /* Disable cross-call reception. In this way even a very wide + * munmap() on another cpu can't tear down the page table + * hierarchy from underneath us, since that can't complete + * until the IPI tlb flush returns. + */ + + __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); + __asm__ __volatile__("wrpr %0, %1, %%pstate" + : : "r" (pstate), "i" (PSTATE_IE)); + + pgdp = pgd_offset(current->mm, address); + if (pgd_none(*pgdp)) + goto out_irqs_on; + p4dp = p4d_offset(pgdp, address); + if (p4d_none(*p4dp)) + goto out_irqs_on; + pudp = pud_offset(p4dp, address); + if (pud_none(*pudp)) + goto out_irqs_on; + pmdp = pmd_offset(pudp, address); + if (pmd_none(*pmdp)) + goto out_irqs_on; + + ptep = pte_offset_map(pmdp, address); + pte = *ptep; + if (!pte_present(pte)) + goto out_unmap; + + paddr = (unsigned long) page_address(pte_page(pte)); + + __asm__ __volatile__("flush %0 + %1" + : /* no outputs */ + : "r" (paddr), + "r" (address & (PAGE_SIZE - 1)) + : "memory"); + +out_unmap: + pte_unmap(ptep); +out_irqs_on: + __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); + +} + +static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, + sigset_t *oldset) +{ + struct signal_frame32 __user *sf; + int i, err, wsaved; + void __user *tail; + int sigframe_size; + u32 psr; + compat_sigset_t seta; + + /* 1. Make sure everything is clean */ + synchronize_user_stack(); + save_and_clear_fpu(); + + wsaved = get_thread_wsaved(); + + sigframe_size = sizeof(*sf); + if (current_thread_info()->fpsaved[0] & FPRS_FEF) + sigframe_size += sizeof(__siginfo_fpu_t); + if (wsaved) + sigframe_size += sizeof(__siginfo_rwin_t); + + sf = (struct signal_frame32 __user *) + get_sigframe(ksig, regs, sigframe_size); + + if (invalid_frame_pointer(sf, sigframe_size)) { + if (show_unhandled_signals) + pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n", + current->comm, current->pid, (unsigned long)sf, + regs->tpc, regs->u_regs[UREG_I7]); + force_sigsegv(ksig->sig); + return -EINVAL; + } + + tail = (sf + 1); + + /* 2. Save the current process state */ + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + err = put_user(regs->tpc, &sf->info.si_regs.pc); + err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); + err |= __put_user(regs->y, &sf->info.si_regs.y); + psr = tstate_to_psr(regs->tstate); + if (current_thread_info()->fpsaved[0] & FPRS_FEF) + psr |= PSR_EF; + err |= __put_user(psr, &sf->info.si_regs.psr); + for (i = 0; i < 16; i++) + err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); + err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); + err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); + for (i = 1; i < 16; i++) + err |= __put_user(((u32 *)regs->u_regs)[2*i], + &sf->v8plus.g_upper[i]); + err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, + &sf->v8plus.asi); + + if (psr & PSR_EF) { + __siginfo_fpu_t __user *fp = tail; + tail += sizeof(*fp); + err |= save_fpu_state(regs, fp); + err |= __put_user((u64)fp, &sf->fpu_save); + } else { + err |= __put_user(0, &sf->fpu_save); + } + if (wsaved) { + __siginfo_rwin_t __user *rwp = tail; + tail += sizeof(*rwp); + err |= save_rwin_state(wsaved, rwp); + err |= __put_user((u64)rwp, &sf->rwin_save); + set_thread_wsaved(0); + } else { + err |= __put_user(0, &sf->rwin_save); + } + + /* If these change we need to know - assignments to seta relies on these sizes */ + BUILD_BUG_ON(_NSIG_WORDS != 1); + BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); + seta.sig[1] = (oldset->sig[0] >> 32); + seta.sig[0] = oldset->sig[0]; + + err |= __put_user(seta.sig[0], &sf->info.si_mask); + err |= __copy_to_user(sf->extramask, &seta.sig[1], + (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); + + if (!wsaved) { + err |= raw_copy_in_user((u32 __user *)sf, + (u32 __user *)(regs->u_regs[UREG_FP]), + sizeof(struct reg_window32)); + } else { + struct reg_window *rp; + + rp = ¤t_thread_info()->reg_window[wsaved - 1]; + for (i = 0; i < 8; i++) + err |= __put_user(rp->locals[i], &sf->ss.locals[i]); + for (i = 0; i < 6; i++) + err |= __put_user(rp->ins[i], &sf->ss.ins[i]); + err |= __put_user(rp->ins[6], &sf->ss.fp); + err |= __put_user(rp->ins[7], &sf->ss.callers_pc); + } + if (err) + return err; + + /* 3. signal handler back-trampoline and parameters */ + regs->u_regs[UREG_FP] = (unsigned long) sf; + regs->u_regs[UREG_I0] = ksig->sig; + regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + regs->u_regs[UREG_I2] = (unsigned long) &sf->info; + + /* 4. signal handler */ + regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; + regs->tnpc = (regs->tpc + 4); + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + + /* 5. return to kernel instructions */ + if (ksig->ka.ka_restorer) { + regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; + } else { + unsigned long address = ((unsigned long)&(sf->insns[0])); + + regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); + + err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ + err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ + if (err) + return err; + flush_signal_insns(address); + } + return 0; +} + +static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, + sigset_t *oldset) +{ + struct rt_signal_frame32 __user *sf; + int i, err, wsaved; + void __user *tail; + int sigframe_size; + u32 psr; + + /* 1. Make sure everything is clean */ + synchronize_user_stack(); + save_and_clear_fpu(); + + wsaved = get_thread_wsaved(); + + sigframe_size = sizeof(*sf); + if (current_thread_info()->fpsaved[0] & FPRS_FEF) + sigframe_size += sizeof(__siginfo_fpu_t); + if (wsaved) + sigframe_size += sizeof(__siginfo_rwin_t); + + sf = (struct rt_signal_frame32 __user *) + get_sigframe(ksig, regs, sigframe_size); + + if (invalid_frame_pointer(sf, sigframe_size)) { + if (show_unhandled_signals) + pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n", + current->comm, current->pid, (unsigned long)sf, + regs->tpc, regs->u_regs[UREG_I7]); + force_sigsegv(ksig->sig); + return -EINVAL; + } + + tail = (sf + 1); + + /* 2. Save the current process state */ + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + err = put_user(regs->tpc, &sf->regs.pc); + err |= __put_user(regs->tnpc, &sf->regs.npc); + err |= __put_user(regs->y, &sf->regs.y); + psr = tstate_to_psr(regs->tstate); + if (current_thread_info()->fpsaved[0] & FPRS_FEF) + psr |= PSR_EF; + err |= __put_user(psr, &sf->regs.psr); + for (i = 0; i < 16; i++) + err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); + err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); + err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); + for (i = 1; i < 16; i++) + err |= __put_user(((u32 *)regs->u_regs)[2*i], + &sf->v8plus.g_upper[i]); + err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, + &sf->v8plus.asi); + + if (psr & PSR_EF) { + __siginfo_fpu_t __user *fp = tail; + tail += sizeof(*fp); + err |= save_fpu_state(regs, fp); + err |= __put_user((u64)fp, &sf->fpu_save); + } else { + err |= __put_user(0, &sf->fpu_save); + } + if (wsaved) { + __siginfo_rwin_t __user *rwp = tail; + tail += sizeof(*rwp); + err |= save_rwin_state(wsaved, rwp); + err |= __put_user((u64)rwp, &sf->rwin_save); + set_thread_wsaved(0); + } else { + err |= __put_user(0, &sf->rwin_save); + } + + /* Update the siginfo structure. */ + err |= copy_siginfo_to_user32(&sf->info, &ksig->info); + + /* Setup sigaltstack */ + err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); + + err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t)); + + if (!wsaved) { + err |= raw_copy_in_user((u32 __user *)sf, + (u32 __user *)(regs->u_regs[UREG_FP]), + sizeof(struct reg_window32)); + } else { + struct reg_window *rp; + + rp = ¤t_thread_info()->reg_window[wsaved - 1]; + for (i = 0; i < 8; i++) + err |= __put_user(rp->locals[i], &sf->ss.locals[i]); + for (i = 0; i < 6; i++) + err |= __put_user(rp->ins[i], &sf->ss.ins[i]); + err |= __put_user(rp->ins[6], &sf->ss.fp); + err |= __put_user(rp->ins[7], &sf->ss.callers_pc); + } + if (err) + return err; + + /* 3. signal handler back-trampoline and parameters */ + regs->u_regs[UREG_FP] = (unsigned long) sf; + regs->u_regs[UREG_I0] = ksig->sig; + regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; + + /* 4. signal handler */ + regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; + regs->tnpc = (regs->tpc + 4); + if (test_thread_flag(TIF_32BIT)) { + regs->tpc &= 0xffffffff; + regs->tnpc &= 0xffffffff; + } + + /* 5. return to kernel instructions */ + if (ksig->ka.ka_restorer) + regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; + else { + unsigned long address = ((unsigned long)&(sf->insns[0])); + + regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); + + /* mov __NR_rt_sigreturn, %g1 */ + err |= __put_user(0x82102065, &sf->insns[0]); + + /* t 0x10 */ + err |= __put_user(0x91d02010, &sf->insns[1]); + if (err) + return err; + + flush_signal_insns(address); + } + return 0; +} + +static inline void handle_signal32(struct ksignal *ksig, + struct pt_regs *regs) +{ + sigset_t *oldset = sigmask_to_save(); + int err; + + if (ksig->ka.sa.sa_flags & SA_SIGINFO) + err = setup_rt_frame32(ksig, regs, oldset); + else + err = setup_frame32(ksig, regs, oldset); + + signal_setup_done(err, ksig, 0); +} + +static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, + struct sigaction *sa) +{ + switch (regs->u_regs[UREG_I0]) { + case ERESTART_RESTARTBLOCK: + case ERESTARTNOHAND: + no_system_call_restart: + regs->u_regs[UREG_I0] = EINTR; + regs->tstate |= TSTATE_ICARRY; + break; + case ERESTARTSYS: + if (!(sa->sa_flags & SA_RESTART)) + goto no_system_call_restart; + fallthrough; + case ERESTARTNOINTR: + regs->u_regs[UREG_I0] = orig_i0; + regs->tpc -= 4; + regs->tnpc -= 4; + } +} + +/* 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. + */ +void do_signal32(struct pt_regs * regs) +{ + struct ksignal ksig; + unsigned long orig_i0 = 0; + int restart_syscall = 0; + bool has_handler = get_signal(&ksig); + + if (pt_regs_is_syscall(regs) && + (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { + restart_syscall = 1; + orig_i0 = regs->u_regs[UREG_G6]; + } + + if (has_handler) { + if (restart_syscall) + syscall_restart32(orig_i0, regs, &ksig.ka.sa); + handle_signal32(&ksig, regs); + } else { + if (restart_syscall) { + switch (regs->u_regs[UREG_I0]) { + case ERESTARTNOHAND: + case ERESTARTSYS: + case ERESTARTNOINTR: + /* replay the system call when we are done */ + regs->u_regs[UREG_I0] = orig_i0; + regs->tpc -= 4; + regs->tnpc -= 4; + pt_regs_clear_syscall(regs); + fallthrough; + case ERESTART_RESTARTBLOCK: + regs->u_regs[UREG_G1] = __NR_restart_syscall; + regs->tpc -= 4; + regs->tnpc -= 4; + pt_regs_clear_syscall(regs); + } + } + restore_saved_sigmask(); + } +} + +struct sigstack32 { + u32 the_stack; + int cur_status; +}; + +asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) +{ + struct sigstack32 __user *ssptr = + (struct sigstack32 __user *)((unsigned long)(u_ssptr)); + struct sigstack32 __user *ossptr = + (struct sigstack32 __user *)((unsigned long)(u_ossptr)); + int ret = -EFAULT; + + /* First see if old state is wanted. */ + if (ossptr) { + if (put_user(current->sas_ss_sp + current->sas_ss_size, + &ossptr->the_stack) || + __put_user(on_sig_stack(sp), &ossptr->cur_status)) + goto out; + } + + /* Now see if we want to update the new state. */ + if (ssptr) { + u32 ss_sp; + + if (get_user(ss_sp, &ssptr->the_stack)) + goto out; + + /* If the current stack was set with sigaltstack, don't + * swap stacks while we are on it. + */ + ret = -EPERM; + if (current->sas_ss_sp && on_sig_stack(sp)) + goto out; + + /* Since we don't know the extent of the stack, and we don't + * track onstack-ness, but rather calculate it, we must + * presume a size. Ho hum this interface is lossy. + */ + current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; + current->sas_ss_size = SIGSTKSZ; + } + + ret = 0; +out: + return ret; +} + +/* + * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as + * changes likely come with new fields that should be added below. + */ +static_assert(NSIGILL == 11); +static_assert(NSIGFPE == 15); +static_assert(NSIGSEGV == 9); +static_assert(NSIGBUS == 5); +static_assert(NSIGTRAP == 6); +static_assert(NSIGCHLD == 6); +static_assert(NSIGSYS == 2); +static_assert(sizeof(compat_siginfo_t) == 128); +static_assert(__alignof__(compat_siginfo_t) == 4); +static_assert(offsetof(compat_siginfo_t, si_signo) == 0x00); +static_assert(offsetof(compat_siginfo_t, si_errno) == 0x04); +static_assert(offsetof(compat_siginfo_t, si_code) == 0x08); +static_assert(offsetof(compat_siginfo_t, si_pid) == 0x0c); +static_assert(offsetof(compat_siginfo_t, si_uid) == 0x10); +static_assert(offsetof(compat_siginfo_t, si_tid) == 0x0c); +static_assert(offsetof(compat_siginfo_t, si_overrun) == 0x10); +static_assert(offsetof(compat_siginfo_t, si_status) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_utime) == 0x18); +static_assert(offsetof(compat_siginfo_t, si_stime) == 0x1c); +static_assert(offsetof(compat_siginfo_t, si_value) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_int) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_ptr) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_addr) == 0x0c); +static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10); +static_assert(offsetof(compat_siginfo_t, si_addr_lsb) == 0x10); +static_assert(offsetof(compat_siginfo_t, si_lower) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_upper) == 0x18); +static_assert(offsetof(compat_siginfo_t, si_pkey) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_perf_data) == 0x10); +static_assert(offsetof(compat_siginfo_t, si_perf_type) == 0x14); +static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18); +static_assert(offsetof(compat_siginfo_t, si_band) == 0x0c); +static_assert(offsetof(compat_siginfo_t, si_fd) == 0x10); |