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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [mips64/] [kernel/] [signal_n32.c] - Rev 1275
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/* * Copyright (C) 2003 Broadcom Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <linux/config.h> #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 <asm/asm.h> #include <asm/bitops.h> #include <asm/pgalloc.h> #include <asm/stackframe.h> #include <asm/uaccess.h> #include <asm/ucontext.h> #include <asm/system.h> #include <asm/fpu.h> /* * Including <asm/unistd.h would give use the 64-bit syscall numbers ... */ #define __NR_N32_rt_sigreturn 6211 #define __NR_N32_restart_syscall 6214 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* IRIX compatible stack_t */ typedef struct sigaltstack32 { s32 ss_sp; __kernel_size_t32 ss_size; int ss_flags; } stack32_t; struct ucontextn32 { u32 uc_flags; s32 uc_link; stack32_t uc_stack; struct sigcontext uc_mcontext; sigset_t uc_sigmask; /* mask last for extensibility */ }; struct rt_sigframe_n32 { u32 rs_ass[4]; /* argument save space for o32 */ u32 rs_code[2]; /* signal trampoline */ struct siginfo rs_info; struct ucontextn32 rs_uc; }; extern asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc); extern int inline setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc); asmlinkage void sysn32_rt_sigreturn(abi64_no_regargs, struct pt_regs regs) { struct rt_sigframe_n32 *frame; sigset_t set; stack_t st; s32 sp; frame = (struct rt_sigframe_n32 *) regs.regs[29]; if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) goto badframe; sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) goto badframe; /* The ucontext contains a stack32_t, so we must convert! */ if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) goto badframe; st.ss_size = (long) sp; if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) goto badframe; if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) goto badframe; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ do_sigaltstack(&st, NULL, regs.regs[29]); /* * Don't let your children do this ... */ __asm__ __volatile__( "move\t$29, %0\n\t" "j\tret_from_sys_call" :/* no outputs */ :"r" (®s)); /* Unreached */ badframe: force_sig(SIGSEGV, current); } /* * Determine which stack to use.. */ static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) { unsigned long sp; /* Default to using normal stack */ sp = regs->regs[29]; /* * FPU emulator may have it's own trampoline active just * above the user stack, 16-bytes before the next lowest * 16 byte boundary. Try to avoid trashing it. */ sp -= 32; /* This is the X/Open sanctioned signal stack switching. */ if ((ka->sa.sa_flags & SA_ONSTACK) && ! on_sig_stack(sp)) sp = current->sas_ss_sp + current->sas_ss_size; return (void *)((sp - frame_size) & ALMASK); } void setup_rt_frame_n32(struct k_sigaction * ka, struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) { struct rt_sigframe_n32 *frame; int err = 0; s32 sp; frame = get_sigframe(ka, regs, sizeof(*frame)); if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) goto give_sigsegv; /* * Set up the return code ... * * li v0, __NR_rt_sigreturn * syscall */ err |= __put_user(0x24020000 + __NR_N32_rt_sigreturn, frame->rs_code + 0); err |= __put_user(0x0000000c , frame->rs_code + 1); flush_cache_sigtramp((unsigned long) frame->rs_code); /* Create siginfo. */ err |= copy_siginfo_to_user(&frame->rs_info, info); /* Create the ucontext. */ err |= __put_user(0, &frame->rs_uc.uc_flags); err |= __put_user(0, &frame->rs_uc.uc_link); sp = (int) (long) current->sas_ss_sp; err |= __put_user(sp, &frame->rs_uc.uc_stack.ss_sp); err |= __put_user(sas_ss_flags(regs->regs[29]), &frame->rs_uc.uc_stack.ss_flags); err |= __put_user(current->sas_ss_size, &frame->rs_uc.uc_stack.ss_size); err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); if (err) goto give_sigsegv; /* * Arguments to signal handler: * * a0 = signal number * a1 = 0 (should be cause) * a2 = pointer to ucontext * * $25 and c0_epc point to the signal handler, $29 points to * the struct rt_sigframe. */ regs->regs[ 4] = signr; regs->regs[ 5] = (unsigned long) &frame->rs_info; regs->regs[ 6] = (unsigned long) &frame->rs_uc; regs->regs[29] = (unsigned long) frame; regs->regs[31] = (unsigned long) frame->rs_code; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; #if DEBUG_SIG printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", current->comm, current->pid, frame, regs->cp0_epc, regs->regs[31]); #endif return; give_sigsegv: if (signr == SIGSEGV) ka->sa.sa_handler = SIG_DFL; force_sig(SIGSEGV, current); }
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