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hurd: Implement x86_64/intr-msg.h
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230319151017.531737-18-bugaevc@gmail.com>
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Sergey Bugaev
Samuel Thibault
parent
57df0f16b4
commit
892f702827
119
sysdeps/mach/hurd/x86_64/intr-msg.h
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119
sysdeps/mach/hurd/x86_64/intr-msg.h
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/* Machine-dependent details of interruptible RPC messaging. x86_64 version.
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Copyright (C) 1995-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Note that we must mark OPTION and TIMEOUT as outputs of this operation,
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to indicate that the signal thread might mutate them as part
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of sending us to a signal handler. */
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#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify, cancel_p, intr_port_p) \
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({ \
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error_t err; \
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register uintptr_t rcv_size_r10 asm ("r10") = rcv_size; \
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register uintptr_t rcv_name_r8 asm ("r8") = rcv_name; \
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register uintptr_t timeout_r9 asm ("r9") = timeout; \
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asm volatile ( \
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".globl _hurd_intr_rpc_msg_about_to\n" \
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".globl _hurd_intr_rpc_msg_setup_done\n" \
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".globl _hurd_intr_rpc_msg_in_trap\n" \
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/* Clear rax before we do the check for cancel below. This is to
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detect rax being set to non-zero (actually MACH_SEND_INTERRUPTED)
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from the outside (namely, _hurdsig_abort_rpcs), which signals us
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to skip the trap we were about to enter. */ \
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" xor %[err], %[err]\n" \
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"_hurd_intr_rpc_msg_about_to:" \
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/* We need to make a last check of cancel, in case we got interrupted
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right before _hurd_intr_rpc_msg_about_to. */ \
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" cmpl $0, %[cancel]\n" \
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" jz _hurd_intr_rpc_msg_do\n" \
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/* We got interrupted, note so and return EINTR. */ \
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" movl $0, %[intr_port]\n" \
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" movl %[eintr], %[err]\n" \
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" jmp _hurd_intr_rpc_msg_sp_restored\n" \
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"_hurd_intr_rpc_msg_do:" \
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/* Ok, prepare the mach_msg_trap arguments. We pass the first 6 args
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in registers, and push the last one and a fake return address. */ \
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" pushq %[notify]\n" \
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" pushq $0\n" \
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"_hurd_intr_rpc_msg_setup_done:" \
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/* From here on, it is safe to make us jump over the syscall. Now
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check if we have been told to skip the syscall while running
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the above. */ \
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" test %[err], %[err]\n" \
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" jnz _hurd_intr_rpc_msg_in_trap\n" \
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/* Do the actual syscall. */ \
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" movq $-25, %%rax\n" \
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"_hurd_intr_rpc_msg_do_trap: syscall # status in %[err]\n" \
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"_hurd_intr_rpc_msg_in_trap:" \
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/* Clean the arguments. */ \
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" addq $16, %%rsp\n" \
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"_hurd_intr_rpc_msg_sp_restored:" \
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: [err] "=&a" (err), "+S" (option), [intr_port] "=m" (*intr_port_p), \
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"+r" (timeout_r9) \
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: "D" (msg), "d" (send_size), "r" (rcv_size_r10), "r" (rcv_name_r8), \
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[notify] "rm" ((uintptr_t) notify), [cancel] "m" (*cancel_p), \
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[eintr] "i" (EINTR) \
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: "rcx", "r11"); \
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timeout = timeout_r9; \
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err; \
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})
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#include "hurdfault.h"
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/* This cannot be an inline function because it calls setjmp. */
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#define SYSCALL_EXAMINE(state, callno) \
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({ \
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struct { unsigned char c[2]; } *p = (void *) ((state)->rip - 2); \
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int result; \
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if (_hurdsig_catch_memory_fault (p)) \
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return 0; \
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if (result = p->c[0] == 0xf && p->c[1] == 0x5) \
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/* The PC appears to be just after a `syscall' instruction. \
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This is a system call in progress; %rax holds the call number. */ \
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*(callno) = (state)->rax; \
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_hurdsig_end_catch_fault (); \
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result; \
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})
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/* This cannot be an inline function because it calls setjmp. */
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#define MSG_EXAMINE(state, msgid, rcvname, send_name, opt, tmout) \
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({ \
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int ret = 0; \
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const struct machine_thread_state *s = (state); \
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const mach_msg_header_t *msg = (const void *) s->rdi; \
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*(rcvname) = s->r8; \
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*(opt) = s->rsi; \
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*(tmout) = s->r9; \
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if (msg == 0) \
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{ \
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*(send_name) = MACH_PORT_NULL; \
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*(msgid) = 0; \
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} \
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else \
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{ \
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ret = _hurdsig_catch_memory_fault (msg) ? -1 : 0; \
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if (ret == 0) \
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{ \
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*(send_name) = msg->msgh_remote_port; \
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*(msgid) = msg->msgh_id; \
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_hurdsig_end_catch_fault (); \
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} \
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} \
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ret; \
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})
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