diff options
Diffstat (limited to 'sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c')
| -rw-r--r-- | sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c b/sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c deleted file mode 100644 index 37ef821..0000000 --- a/sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c +++ /dev/null @@ -1,213 +0,0 @@ -/* signal-dispatch-lowlevel.c - ia32 specific signal handling functions. - Copyright (C) 2008 Free Software Foundation, Inc. - Written by Neal H. Walfield <neal@gnu.org>. - - This file is part of the GNU Hurd. - - The GNU Hurd is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public License - as published by the Free Software Foundation; either version 3 of - the License, or (at your option) any later version. - - The GNU Hurd 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this program. If not, see - <http://www.gnu.org/licenses/>. */ - -#include <pt-internal.h> -#include <sig-internal.h> - -#include <hurd/thread.h> -#include <pthread.h> -#include <stdint.h> -#include <atomic.h> - -extern char _signal_dispatch_entry; -/* - 0(%esp) a pointer to the thread's struct signal_state. - - 4(%esp) a pointer to a siginfo_t. - - 8(%esp) is a pointer to the ss_flags field (or NULL). - - 12(%esp)+4 is the value of the sp when the thread was interrupted (intr_sp) - - 0(intr_sp) is the value of the ip when the thread was interrupted. - - 16(%esp) - 16 byte register save area -*/ -__asm__ ("\n\ - .globl _signal_dispatch_entry\n\ -_signal_dispatch_entry:\n\ - /* Save caller saved registers (16 bytes). */\n\ - mov %eax, 16(%esp)\n\ - mov %ecx, 16+4(%esp)\n\ - mov %edx, 16+8(%esp)\n\ - pushf\n\ - popl %eax\n\ - mov %eax, 16+12(%esp)\n\ -\n\ - /* Reset EFLAGS. */\n\ - cld\n\ - call signal_dispatch\n\ -\n\ - /* Get the original stack and begin restoration. */\n\ - mov 12(%esp), %edx\n\ -\n\ - /* Move the saved registers to the user stack. */\n\ - sub $16, %edx\n\ - /* eax. */\n\ - mov 16+0(%esp), %ecx\n\ - mov %ecx, 0(%edx)\n\ - /* ecx. */\n\ - mov 16+4(%esp), %ecx\n\ - mov %ecx, 4(%edx)\n\ - /* edx. */\n\ - mov 16+8(%esp), %ecx\n\ - mov %ecx, 8(%edx)\n\ - /* eflags. */\n\ - mov 16+12(%esp), %ecx\n\ - mov %ecx, 12(%edx)\n\ -\n\ - /* Get the pointer to the sigaltstack flags. */\n\ - mov 8(%esp), %ecx\n\ -\n\ - /* Restore the user stack. */\n\ - mov %edx, %esp\n\ -\n\ - /* Clear the SA_ONSTACK flag. */\n\ - and %ecx, %ecx\n\ - jz after_clear\n\ - lock; and $~1, 0(%ecx)\n\ -after_clear:\n\ -\n\ - /* Restore eflags, the scratch regs and the original sp and ip. */\n\ - popl %eax\n\ - popl %ecx\n\ - popl %edx\n\ - popf\n\ - ret\n"); - -extern char _signal_dispatch_entry_self; -/* - 0(%esp) is the return address (we ignore it) - - 4(%esp) is the sp to load - - Since we are returning to signal_dispatch_lowlevel's caller, we - also need to restore its frame pointer. */ -__asm__ ("\n\ - .globl _signal_dispatch_entry_self\n\ -_signal_dispatch_entry_self:\n\ - mov 0(%ebp), %ebp\n\ - mov 4(%esp), %esp\n\ - jmp _signal_dispatch_entry\n"); - -void -signal_dispatch_lowlevel (struct signal_state *ss, pthread_t tid, - siginfo_t si) -{ - assert (pthread_mutex_trylock (&ss->lock) == EBUSY); - - struct __pthread *thread = __pthread_getid (tid); - - bool self = tid == pthread_self (); - - uintptr_t intr_sp; - - if (self) - { - /* The return address is just before the first argument. */ - intr_sp = (uintptr_t) &ss - 4; - assert (* (void **) intr_sp == __builtin_return_address (0)); - } - else - { - struct hurd_thread_exregs_in in; - memset (&in, 0, sizeof (in)); - struct hurd_thread_exregs_out out; - - error_t err; - err = rm_thread_exregs (ADDR_VOID, thread->object, - HURD_EXREGS_STOP | HURD_EXREGS_ABORT_IPC - | HURD_EXREGS_GET_REGS, - in, &out); - if (err) - panic ("Failed to modify thread " ADDR_FMT, - ADDR_PRINTF (thread->object)); - - intr_sp = out.sp; - - /* Push the ip on the user stack. */ - intr_sp -= 4; - * (uintptr_t *) intr_sp = out.ip; - } - - bool altstack = false; - uintptr_t sp; - if (! (ss->actions[si.si_signo - 1].sa_flags & SA_ONSTACK) - || (ss->stack.ss_flags & SS_DISABLE) - || (ss->stack.ss_flags & SS_ONSTACK)) - { - assert (! self); - sp = intr_sp; - } - else - { - /* The stack grows down. */ - sp = (uintptr_t) ss->stack.ss_sp + ss->stack.ss_size; - - /* We know intimately that SS_ONSTACK is the least significant - bit. */ - assert (SS_ONSTACK == 1); - atomic_bit_set (&ss->stack.ss_flags, 0); - - altstack = true; - } - - /* Set up the call frame for a call to signal_dispatch_entry. */ - - /* Allocate a siginfo structure on the stack. */ - sp = sp - sizeof (siginfo_t); - siginfo_t *sip = (void *) sp; - /* Copy the user supplied values. */ - *sip = si; - - /* Add space for the 4 caller saved registers. */ - sp -= 4 * sizeof (uintptr_t); - - /* Save the interrupted sp. */ - sp -= 4; - * (uintptr_t *) sp = intr_sp; - - /* Address of the ss_flags. */ - sp -= 4; - if (altstack) - * (uintptr_t *) sp = (uintptr_t) &ss->stack.ss_flags; - else - * (uintptr_t *) sp = 0; - - /* Push the parameters to signal_dispatch. */ - - /* signal info structure. */ - sp -= 4; - * (uintptr_t *) sp = (uintptr_t) sip; - - /* The ss. */ - sp -= 4; - * (uintptr_t *) sp = (uintptr_t) ss; - - pthread_mutex_transfer_np (&ss->lock, tid); - - if (self) - ((void (*) (uintptr_t)) &_signal_dispatch_entry_self) ((uintptr_t) sp); - else - { - struct hurd_thread_exregs_in in; - struct hurd_thread_exregs_out out; - - in.sp = sp; - in.ip = (uintptr_t) &_signal_dispatch_entry; - - rm_thread_exregs (ADDR_VOID, thread->object, - HURD_EXREGS_SET_SP_IP - | HURD_EXREGS_START | HURD_EXREGS_ABORT_IPC, - in, &out); - } -} |