diff options
Diffstat (limited to 'sysdeps/mach/hurd/mips/trampoline.c')
| -rw-r--r-- | sysdeps/mach/hurd/mips/trampoline.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/sysdeps/mach/hurd/mips/trampoline.c b/sysdeps/mach/hurd/mips/trampoline.c deleted file mode 100644 index 34e363b1aa..0000000000 --- a/sysdeps/mach/hurd/mips/trampoline.c +++ /dev/null @@ -1,292 +0,0 @@ -/* Set thread_state for sighandler, and sigcontext to recover. MIPS version. - Copyright (C) 1996, 1997, 1998, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library 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 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <hurd/signal.h> -#include <hurd/userlink.h> -#include <thread_state.h> -#include <assert.h> -#include <errno.h> -#include "hurdfault.h" -#include <intr-msg.h> - - -struct sigcontext * -_hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler, - int signo, struct hurd_signal_detail *detail, - volatile int rpc_wait, - struct machine_thread_all_state *state) -{ - __label__ trampoline, rpc_wait_trampoline, firewall; - void *volatile sigsp; - struct sigcontext *scp; - struct - { - int signo; - long int sigcode; - struct sigcontext *scp; /* Points to ctx, below. */ - void *sigreturn_addr; - void *sigreturn_returns_here; - struct sigcontext *return_scp; /* Same; arg to sigreturn. */ - struct sigcontext ctx; - struct hurd_userlink link; - } *stackframe; - - if (ss->context) - { - /* We have a previous sigcontext that sigreturn was about - to restore when another signal arrived. We will just base - our setup on that. */ - if (! _hurdsig_catch_memory_fault (ss->context)) - { - memcpy (&state->basic, &ss->context->sc_mips_thread_state, - sizeof (state->basic)); - memcpy (&state->exc, &ss->context->sc_mips_exc_state, - sizeof (state->exc)); - state->set = (1 << MIPS_THREAD_STATE) | (1 << MIPS_EXC_STATE); - if (state->exc.coproc_state & SC_COPROC_USE_FPU) - { - memcpy (&state->fpu, &ss->context->sc_mips_float_state, - sizeof (state->fpu)); - state->set |= (1 << MIPS_FLOAT_STATE); - } - } - } - - if (! machine_get_basic_state (ss->thread, state)) - return NULL; - - /* Save the original SP in the gratuitous s0 ($16) slot. - We may need to reset the SP (the `r29' slot) to avoid clobbering an - interrupted RPC frame. */ - state->basic.r16 = state->basic.r29; - - if ((ss->actions[signo].sa_flags & SA_ONSTACK) && - !(ss->sigaltstack.ss_flags & (SS_DISABLE|SS_ONSTACK))) - { - sigsp = ss->sigaltstack.ss_sp + ss->sigaltstack.ss_size; - ss->sigaltstack.ss_flags |= SS_ONSTACK; - /* XXX need to set up base of new stack for - per-thread variables, cthreads. */ - } - else - sigsp = (char *) state->basic.r29; - - /* Push the arguments to call `trampoline' on the stack. */ - sigsp -= sizeof (*stackframe); - stackframe = sigsp; - - if (_hurdsig_catch_memory_fault (stackframe)) - { - /* We got a fault trying to write the stack frame. - We cannot set up the signal handler. - Returning NULL tells our caller, who will nuke us with a SIGILL. */ - return NULL; - } - else - { - int ok; - - extern void _hurdsig_longjmp_from_handler (void *, jmp_buf, int); - - /* Add a link to the thread's active-resources list. We mark this as - the only user of the "resource", so the cleanup function will be - called by any longjmp which is unwinding past the signal frame. - The cleanup function (in sigunwind.c) will make sure that all the - appropriate cleanups done by sigreturn are taken care of. */ - stackframe->link.cleanup = &_hurdsig_longjmp_from_handler; - stackframe->link.cleanup_data = &stackframe->ctx; - stackframe->link.resource.next = NULL; - stackframe->link.resource.prevp = NULL; - stackframe->link.thread.next = ss->active_resources; - stackframe->link.thread.prevp = &ss->active_resources; - if (stackframe->link.thread.next) - stackframe->link.thread.next->thread.prevp - = &stackframe->link.thread.next; - ss->active_resources = &stackframe->link; - - /* Set up the arguments for the signal handler. */ - stackframe->signo = signo; - stackframe->sigcode = detail->code; - stackframe->scp = stackframe->return_scp = scp = &stackframe->ctx; - stackframe->sigreturn_addr = &__sigreturn; - stackframe->sigreturn_returns_here = &&firewall; /* Crash on return. */ - - /* Set up the sigcontext from the current state of the thread. */ - - scp->sc_onstack = ss->sigaltstack.ss_flags & SS_ONSTACK ? 1 : 0; - - /* struct sigcontext is laid out so that starting at sc_gpr - mimics a struct mips_thread_state. */ - memcpy (&scp->sc_mips_thread_state, - &state->basic, sizeof (state->basic)); - - /* struct sigcontext is laid out so that starting at sc_cause - mimics a struct mips_exc_state. */ - ok = machine_get_state (ss->thread, state, MIPS_EXC_STATE, - &state->exc, &scp->sc_cause, - sizeof (state->exc)); - - if (ok && (scp->sc_coproc_used & SC_COPROC_USE_FPU)) - /* struct sigcontext is laid out so that starting at sc_fpr - mimics a struct mips_float_state. This state - is only meaningful if the coprocessor was used. */ - ok = machine_get_state (ss->thread, state, MIPS_FLOAT_STATE, - &state->fpu, &scp->sc_mips_float_state, - sizeof (state->fpu)); - - _hurdsig_end_catch_fault (); - - if (! ok) - return NULL; - } - - /* Modify the thread state to call the trampoline code on the new stack. */ - if (rpc_wait) - { - /* The signalee thread was blocked in a mach_msg_trap system call, - still waiting for a reply. We will have it run the special - trampoline code which retries the message receive before running - the signal handler. - - To do this we change the OPTION argument in its registers to - enable only message reception, since the request message has - already been sent. */ - - /* The system call arguments are stored in consecutive registers - starting with a0 ($4). */ - struct mach_msg_trap_args *args = (void *) &state->basic.r4; - - if (_hurdsig_catch_memory_fault (args)) - { - /* Faulted accessing ARGS. Bomb. */ - return NULL; - } - - assert (args->option & MACH_RCV_MSG); - /* Disable the message-send, since it has already completed. The - calls we retry need only wait to receive the reply message. */ - args->option &= ~MACH_SEND_MSG; - - /* Limit the time to receive the reply message, in case the server - claimed that `interrupt_operation' succeeded but in fact the RPC - is hung. */ - args->option |= MACH_RCV_TIMEOUT; - args->timeout = _hurd_interrupted_rpc_timeout; - - _hurdsig_end_catch_fault (); - - state->basic.pc = (int) &&rpc_wait_trampoline; - /* The reply-receiving trampoline code runs initially on the original - user stack. We pass it the signal stack pointer in s4 ($20). */ - state->basic.r29 = state->basic.r16; /* Restore mach_msg syscall SP. */ - state->basic.r20 = (int) sigsp; - /* After doing the message receive, the trampoline code will need to - update the v0 ($2) value to be restored by sigreturn. To simplify - the assembly code, we pass the address of its slot in SCP to the - trampoline code in s5 ($21). */ - state->basic.r21 = (int) &scp->sc_gpr[1]; - /* We must preserve the mach_msg_trap args in a0..t2 ($4..$10). - Pass the handler args to the trampoline code in s1..s3 ($17..$19). */ - state->basic.r17 = signo; - state->basic.r18 = detail->code; - state->basic.r19 = (int) scp; - } - else - { - state->basic.pc = (int) &&trampoline; - state->basic.r29 = (int) sigsp; - state->basic.r4 = signo; - state->basic.r5 = detail->code; - state->basic.r6 = (int) scp; - } - - /* We pass the handler function to the trampoline code in s6 ($22). */ - state->basic.r22 = (int) handler; - /* In the callee-saved register s0 ($16), we save the SCP value to pass - to __sigreturn after the handler returns. */ - state->basic.r16 = (int) scp; - - return scp; - - /* The trampoline code follows. This is not actually executed as part of - this function, it is just convenient to write it that way. */ - - rpc_wait_trampoline: - /* This is the entry point when we have an RPC reply message to receive - before running the handler. The MACH_MSG_SEND bit has already been - cleared in the OPTION argument in our registers. For our convenience, - $3 points to the sc_gpr[1] member of the sigcontext (saved v0 ($2)). */ - asm volatile - (".set noat; .set noreorder; .set nomacro\n" - /* Retry the interrupted mach_msg system call. */ -#ifdef __mips64 - "dli $2, -25\n" /* mach_msg_trap */ -#else - "li $2, -25\n" /* mach_msg_trap */ -#endif - "syscall\n" - /* When the sigcontext was saved, v0 was MACH_RCV_INTERRUPTED. But - now the message receive has completed and the original caller of - the RPC (i.e. the code running when the signal arrived) needs to - see the final return value of the message receive in v0. So - store the new v0 value into the sc_gpr[1] member of the sigcontext - (whose address is in s5 to make this code simpler). */ -#ifdef __mips64 - "sd $2, ($21)\n" -#else - "sw $2, ($21)\n" -#endif - /* Since the argument registers needed to have the mach_msg_trap - arguments, we've stored the arguments to the handler function - in registers s1..s3 ($17..$19). */ - "move $4, $17\n" - "move $5, $18\n" - "move $6, $19\n" - /* Switch to the signal stack. */ - "move $29, $20\n"); - - trampoline: - /* Entry point for running the handler normally. The arguments to the - handler function are already in the standard registers: - - a0 SIGNO - a1 SIGCODE - a2 SCP - */ - asm volatile - ("move $25, $22\n" /* Copy s6 to t9 for MIPS ABI. */ - "jal $25; nop\n" /* Call the handler function. */ - /* Call __sigreturn (SCP); this cannot return. */ -#ifdef __mips64 - "dla $1,%0\n" -#else - "la $1,%0\n" -#endif - "j $1\n" - "move $4, $16" /* Set up arg from saved SCP in delay slot. */ - : : "i" (&__sigreturn)); - - /* NOTREACHED */ - asm volatile (".set reorder; .set at; .set macro"); - - firewall: - asm volatile ("hlt: j hlt"); - - return NULL; -} |