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/* Machine-dependent details of interruptible RPC messaging. i386 version.
Copyright (C) 1995-2021 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, see
<https://www.gnu.org/licenses/>. */
/* Note that we must mark OPTION and TIMEOUT as outputs of this operation,
to indicate that the signal thread might mutate them as part
of sending us to a signal handler. */
#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify, cancel_p, intr_port_p) \
({ \
error_t err; \
asm (".globl _hurd_intr_rpc_msg_about_to\n" \
".globl _hurd_intr_rpc_msg_cx_sp\n" \
".globl _hurd_intr_rpc_msg_do_trap\n" \
".globl _hurd_intr_rpc_msg_in_trap\n" \
".globl _hurd_intr_rpc_msg_sp_restored\n" \
"_hurd_intr_rpc_msg_about_to:" \
/* We need to make a last check of cancel, in case we got interrupted
right before _hurd_intr_rpc_msg_about_to. */ \
" cmpl $0, %5\n" \
" jz _hurd_intr_rpc_msg_do\n" \
/* We got interrupted, note so and return EINTR. */ \
" movl $0, %3\n" \
" movl %6, %%eax\n" \
" jmp _hurd_intr_rpc_msg_sp_restored\n" \
"_hurd_intr_rpc_msg_do:" \
/* Ok, push the mach_msg_trap arguments. */ \
" pushl 24(%4)\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl %2\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl 16(%4)\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl 12(%4)\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl 8(%4)\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl %1\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl (%4)\n" \
" .cfi_adjust_cfa_offset 4\n" \
" pushl $0\n" \
" .cfi_adjust_cfa_offset 4\n" \
/* TODO: remove this ecx kludge, we don't need it any more */ \
" movl %%esp, %%ecx\n" \
"_hurd_intr_rpc_msg_cx_sp: movl $-25, %%eax\n" \
"_hurd_intr_rpc_msg_do_trap: lcall $7, $0 # status in %0\n" \
"_hurd_intr_rpc_msg_in_trap:" \
/* Ok, clean the arguments and update OPTION and TIMEOUT. */ \
" addl $8, %%esp\n" \
" .cfi_adjust_cfa_offset -8\n" \
" popl %1\n" \
" .cfi_adjust_cfa_offset -4\n" \
" addl $12, %%esp\n" \
" .cfi_adjust_cfa_offset -12\n" \
" popl %2\n" \
" .cfi_adjust_cfa_offset -4\n" \
" addl $4, %%esp\n" \
" .cfi_adjust_cfa_offset -4\n" \
"_hurd_intr_rpc_msg_sp_restored:" \
: "=a" (err), "+r" (option), "+r" (timeout), "=m" (*intr_port_p) \
: "r" (&msg), "m" (*cancel_p), "i" (EINTR) \
: "ecx"); \
err; \
})
static void inline
INTR_MSG_BACK_OUT (struct i386_thread_state *state)
{
extern const void _hurd_intr_rpc_msg_cx_sp;
if (state->eip >= (natural_t) &_hurd_intr_rpc_msg_cx_sp)
state->uesp = state->ecx;
else
state->ecx = state->uesp;
}
#include "hurdfault.h"
/* This cannot be an inline function because it calls setjmp. */
#define SYSCALL_EXAMINE(state, callno) \
({ \
struct { unsigned int c[2]; } *p = (void *) ((state)->eip - 7); \
int result; \
if (_hurdsig_catch_memory_fault (p)) \
return 0; \
if (result = p->c[0] == 0x0000009a && (p->c[1] & 0x00ffffff) == 0x00000700) \
/* The PC is just after an `lcall $7,$0' instruction. \
This is a system call in progress; %eax holds the call number. */ \
*(callno) = (state)->eax; \
_hurdsig_end_catch_fault (); \
result; \
})
struct mach_msg_trap_args
{
void *retaddr; /* Address mach_msg_trap will return to. */
/* This is the order of arguments to mach_msg_trap. */
mach_msg_header_t *msg;
mach_msg_option_t option;
mach_msg_size_t send_size;
mach_msg_size_t rcv_size;
mach_port_t rcv_name;
mach_msg_timeout_t timeout;
mach_port_t notify;
};
/* This cannot be an inline function because it calls setjmp. */
#define MSG_EXAMINE(state, msgid, rcvname, send_name, opt, tmout) \
({ \
const struct mach_msg_trap_args *args = (const void *) (state)->uesp; \
mach_msg_header_t *msg; \
_hurdsig_catch_memory_fault (args) ? -1 : \
({ \
msg = args->msg; \
*(opt) = args->option; \
*(tmout) = args->timeout; \
*(rcvname) = args->rcv_name; \
_hurdsig_end_catch_fault (); \
if (msg == 0) \
{ \
*(send_name) = MACH_PORT_NULL; \
*(msgid) = 0; \
} \
else \
{ \
if (_hurdsig_catch_memory_fault (msg)) \
return -1; \
*(send_name) = msg->msgh_remote_port; \
*(msgid) = msg->msgh_id; \
_hurdsig_end_catch_fault (); \
} \
0; \
}); \
})
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