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747 lines
20 KiB
747 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* arch/sparc64/kernel/signal32.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* Copyright (C) 1995 David S. Miller ([email protected]) |
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* Copyright (C) 1996 Miguel de Icaza ([email protected]) |
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* Copyright (C) 1997 Eddie C. Dost ([email protected]) |
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* Copyright (C) 1997,1998 Jakub Jelinek ([email protected]) |
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*/ |
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|
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/signal.h> |
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#include <linux/errno.h> |
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#include <linux/wait.h> |
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#include <linux/ptrace.h> |
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#include <linux/unistd.h> |
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#include <linux/mm.h> |
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#include <linux/tty.h> |
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#include <linux/binfmts.h> |
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#include <linux/compat.h> |
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#include <linux/bitops.h> |
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#include <linux/tracehook.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/ptrace.h> |
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#include <asm/psrcompat.h> |
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#include <asm/fpumacro.h> |
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#include <asm/visasm.h> |
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#include <asm/compat_signal.h> |
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#include <asm/switch_to.h> |
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|
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#include "sigutil.h" |
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#include "kernel.h" |
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|
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/* This magic should be in g_upper[0] for all upper parts |
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* to be valid. |
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*/ |
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#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 |
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typedef struct { |
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unsigned int g_upper[8]; |
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unsigned int o_upper[8]; |
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unsigned int asi; |
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} siginfo_extra_v8plus_t; |
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|
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struct signal_frame32 { |
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struct sparc_stackf32 ss; |
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__siginfo32_t info; |
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/* __siginfo_fpu_t * */ u32 fpu_save; |
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unsigned int insns[2]; |
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unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; |
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unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ |
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/* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ |
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siginfo_extra_v8plus_t v8plus; |
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/* __siginfo_rwin_t * */u32 rwin_save; |
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} __attribute__((aligned(8))); |
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|
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struct rt_signal_frame32 { |
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struct sparc_stackf32 ss; |
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compat_siginfo_t info; |
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struct pt_regs32 regs; |
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compat_sigset_t mask; |
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/* __siginfo_fpu_t * */ u32 fpu_save; |
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unsigned int insns[2]; |
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compat_stack_t stack; |
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unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ |
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/* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ |
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siginfo_extra_v8plus_t v8plus; |
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/* __siginfo_rwin_t * */u32 rwin_save; |
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} __attribute__((aligned(8))); |
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|
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/* Checks if the fp is valid. We always build signal frames which are |
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* 16-byte aligned, therefore we can always enforce that the restore |
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* frame has that property as well. |
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*/ |
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static bool invalid_frame_pointer(void __user *fp, int fplen) |
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{ |
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if ((((unsigned long) fp) & 15) || |
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((unsigned long)fp) > 0x100000000ULL - fplen) |
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return true; |
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return false; |
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} |
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|
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void do_sigreturn32(struct pt_regs *regs) |
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{ |
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struct signal_frame32 __user *sf; |
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compat_uptr_t fpu_save; |
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compat_uptr_t rwin_save; |
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unsigned int psr, ufp; |
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unsigned int pc, npc; |
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sigset_t set; |
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compat_sigset_t seta; |
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int err, i; |
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|
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/* Always make any pending restarted system calls return -EINTR */ |
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current->restart_block.fn = do_no_restart_syscall; |
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synchronize_user_stack(); |
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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
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sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; |
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|
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/* 1. Make sure we are not getting garbage from the user */ |
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if (invalid_frame_pointer(sf, sizeof(*sf))) |
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goto segv; |
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|
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if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) |
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goto segv; |
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if (ufp & 0x7) |
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goto segv; |
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|
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if (__get_user(pc, &sf->info.si_regs.pc) || |
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__get_user(npc, &sf->info.si_regs.npc)) |
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goto segv; |
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|
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if ((pc | npc) & 3) |
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goto segv; |
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|
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if (test_thread_flag(TIF_32BIT)) { |
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pc &= 0xffffffff; |
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npc &= 0xffffffff; |
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} |
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regs->tpc = pc; |
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regs->tnpc = npc; |
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|
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/* 2. Restore the state */ |
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err = __get_user(regs->y, &sf->info.si_regs.y); |
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err |= __get_user(psr, &sf->info.si_regs.psr); |
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|
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for (i = UREG_G1; i <= UREG_I7; i++) |
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err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); |
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if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { |
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err |= __get_user(i, &sf->v8plus.g_upper[0]); |
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if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { |
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unsigned long asi; |
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|
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for (i = UREG_G1; i <= UREG_I7; i++) |
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err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); |
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err |= __get_user(asi, &sf->v8plus.asi); |
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regs->tstate &= ~TSTATE_ASI; |
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regs->tstate |= ((asi & 0xffUL) << 24UL); |
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} |
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} |
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|
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/* User can only change condition codes in %tstate. */ |
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regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); |
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regs->tstate |= psr_to_tstate_icc(psr); |
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|
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/* Prevent syscall restart. */ |
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pt_regs_clear_syscall(regs); |
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|
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err |= __get_user(fpu_save, &sf->fpu_save); |
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if (!err && fpu_save) |
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err |= restore_fpu_state(regs, compat_ptr(fpu_save)); |
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err |= __get_user(rwin_save, &sf->rwin_save); |
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if (!err && rwin_save) { |
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if (restore_rwin_state(compat_ptr(rwin_save))) |
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goto segv; |
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} |
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err |= __get_user(seta.sig[0], &sf->info.si_mask); |
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err |= copy_from_user(&seta.sig[1], &sf->extramask, |
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(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
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if (err) |
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goto segv; |
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|
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set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); |
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set_current_blocked(&set); |
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return; |
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|
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segv: |
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force_sig(SIGSEGV); |
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} |
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|
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asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
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{ |
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struct rt_signal_frame32 __user *sf; |
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unsigned int psr, pc, npc, ufp; |
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compat_uptr_t fpu_save; |
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compat_uptr_t rwin_save; |
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sigset_t set; |
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int err, i; |
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|
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/* Always make any pending restarted system calls return -EINTR */ |
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current->restart_block.fn = do_no_restart_syscall; |
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synchronize_user_stack(); |
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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
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sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; |
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|
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/* 1. Make sure we are not getting garbage from the user */ |
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if (invalid_frame_pointer(sf, sizeof(*sf))) |
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goto segv; |
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|
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if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
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goto segv; |
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|
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if (ufp & 0x7) |
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goto segv; |
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|
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if (__get_user(pc, &sf->regs.pc) || |
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__get_user(npc, &sf->regs.npc)) |
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goto segv; |
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|
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if ((pc | npc) & 3) |
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goto segv; |
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|
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if (test_thread_flag(TIF_32BIT)) { |
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pc &= 0xffffffff; |
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npc &= 0xffffffff; |
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} |
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regs->tpc = pc; |
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regs->tnpc = npc; |
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|
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/* 2. Restore the state */ |
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err = __get_user(regs->y, &sf->regs.y); |
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err |= __get_user(psr, &sf->regs.psr); |
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|
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for (i = UREG_G1; i <= UREG_I7; i++) |
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err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); |
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if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { |
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err |= __get_user(i, &sf->v8plus.g_upper[0]); |
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if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { |
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unsigned long asi; |
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|
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for (i = UREG_G1; i <= UREG_I7; i++) |
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err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); |
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err |= __get_user(asi, &sf->v8plus.asi); |
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regs->tstate &= ~TSTATE_ASI; |
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regs->tstate |= ((asi & 0xffUL) << 24UL); |
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} |
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} |
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/* User can only change condition codes in %tstate. */ |
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regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); |
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regs->tstate |= psr_to_tstate_icc(psr); |
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|
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/* Prevent syscall restart. */ |
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pt_regs_clear_syscall(regs); |
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|
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err |= __get_user(fpu_save, &sf->fpu_save); |
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if (!err && fpu_save) |
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err |= restore_fpu_state(regs, compat_ptr(fpu_save)); |
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err |= get_compat_sigset(&set, &sf->mask); |
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err |= compat_restore_altstack(&sf->stack); |
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if (err) |
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goto segv; |
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|
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err |= __get_user(rwin_save, &sf->rwin_save); |
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if (!err && rwin_save) { |
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if (restore_rwin_state(compat_ptr(rwin_save))) |
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goto segv; |
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} |
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|
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set_current_blocked(&set); |
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return; |
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segv: |
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force_sig(SIGSEGV); |
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} |
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static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
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{ |
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unsigned long sp; |
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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
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sp = regs->u_regs[UREG_FP]; |
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|
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/* |
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* If we are on the alternate signal stack and would overflow it, don't. |
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* Return an always-bogus address instead so we will die with SIGSEGV. |
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*/ |
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if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) |
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return (void __user *) -1L; |
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|
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/* This is the X/Open sanctioned signal stack switching. */ |
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sp = sigsp(sp, ksig) - framesize; |
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|
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/* Always align the stack frame. This handles two cases. First, |
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* sigaltstack need not be mindful of platform specific stack |
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* alignment. Second, if we took this signal because the stack |
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* is not aligned properly, we'd like to take the signal cleanly |
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* and report that. |
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*/ |
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sp &= ~15UL; |
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return (void __user *) sp; |
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} |
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|
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/* The I-cache flush instruction only works in the primary ASI, which |
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* right now is the nucleus, aka. kernel space. |
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* |
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* Therefore we have to kick the instructions out using the kernel |
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* side linear mapping of the physical address backing the user |
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* instructions. |
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*/ |
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static void flush_signal_insns(unsigned long address) |
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{ |
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unsigned long pstate, paddr; |
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pte_t *ptep, pte; |
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pgd_t *pgdp; |
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p4d_t *p4dp; |
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pud_t *pudp; |
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pmd_t *pmdp; |
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|
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/* Commit all stores of the instructions we are about to flush. */ |
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wmb(); |
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|
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/* Disable cross-call reception. In this way even a very wide |
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* munmap() on another cpu can't tear down the page table |
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* hierarchy from underneath us, since that can't complete |
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* until the IPI tlb flush returns. |
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*/ |
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__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); |
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__asm__ __volatile__("wrpr %0, %1, %%pstate" |
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: : "r" (pstate), "i" (PSTATE_IE)); |
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|
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pgdp = pgd_offset(current->mm, address); |
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if (pgd_none(*pgdp)) |
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goto out_irqs_on; |
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p4dp = p4d_offset(pgdp, address); |
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if (p4d_none(*p4dp)) |
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goto out_irqs_on; |
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pudp = pud_offset(p4dp, address); |
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if (pud_none(*pudp)) |
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goto out_irqs_on; |
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pmdp = pmd_offset(pudp, address); |
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if (pmd_none(*pmdp)) |
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goto out_irqs_on; |
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|
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ptep = pte_offset_map(pmdp, address); |
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pte = *ptep; |
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if (!pte_present(pte)) |
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goto out_unmap; |
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|
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paddr = (unsigned long) page_address(pte_page(pte)); |
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|
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__asm__ __volatile__("flush %0 + %1" |
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: /* no outputs */ |
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: "r" (paddr), |
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"r" (address & (PAGE_SIZE - 1)) |
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: "memory"); |
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|
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out_unmap: |
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pte_unmap(ptep); |
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out_irqs_on: |
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__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); |
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|
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} |
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|
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static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs, |
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sigset_t *oldset) |
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{ |
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struct signal_frame32 __user *sf; |
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int i, err, wsaved; |
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void __user *tail; |
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int sigframe_size; |
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u32 psr; |
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compat_sigset_t seta; |
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|
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/* 1. Make sure everything is clean */ |
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synchronize_user_stack(); |
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save_and_clear_fpu(); |
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|
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wsaved = get_thread_wsaved(); |
|
|
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sigframe_size = sizeof(*sf); |
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if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
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sigframe_size += sizeof(__siginfo_fpu_t); |
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if (wsaved) |
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sigframe_size += sizeof(__siginfo_rwin_t); |
|
|
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sf = (struct signal_frame32 __user *) |
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get_sigframe(ksig, regs, sigframe_size); |
|
|
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if (invalid_frame_pointer(sf, sigframe_size)) { |
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if (show_unhandled_signals) |
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pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n", |
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current->comm, current->pid, (unsigned long)sf, |
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regs->tpc, regs->u_regs[UREG_I7]); |
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force_sigsegv(ksig->sig); |
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return -EINVAL; |
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} |
|
|
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tail = (sf + 1); |
|
|
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/* 2. Save the current process state */ |
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if (test_thread_flag(TIF_32BIT)) { |
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regs->tpc &= 0xffffffff; |
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regs->tnpc &= 0xffffffff; |
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} |
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err = put_user(regs->tpc, &sf->info.si_regs.pc); |
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err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); |
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err |= __put_user(regs->y, &sf->info.si_regs.y); |
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psr = tstate_to_psr(regs->tstate); |
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if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
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psr |= PSR_EF; |
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err |= __put_user(psr, &sf->info.si_regs.psr); |
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for (i = 0; i < 16; i++) |
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err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); |
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err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); |
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err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); |
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for (i = 1; i < 16; i++) |
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err |= __put_user(((u32 *)regs->u_regs)[2*i], |
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&sf->v8plus.g_upper[i]); |
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err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, |
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&sf->v8plus.asi); |
|
|
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if (psr & PSR_EF) { |
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__siginfo_fpu_t __user *fp = tail; |
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tail += sizeof(*fp); |
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err |= save_fpu_state(regs, fp); |
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err |= __put_user((u64)fp, &sf->fpu_save); |
|
} else { |
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err |= __put_user(0, &sf->fpu_save); |
|
} |
|
if (wsaved) { |
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__siginfo_rwin_t __user *rwp = tail; |
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tail += sizeof(*rwp); |
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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]; |
|
|
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err |= __put_user(seta.sig[0], &sf->info.si_mask); |
|
err |= __copy_to_user(sf->extramask, &seta.sig[1], |
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(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
|
|
|
if (!wsaved) { |
|
err |= 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 |= 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; |
|
}
|
|
|