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3cf595e5 | 1 | /* Machine-dependent details of interruptible RPC messaging. i386 version. |
6d7e8eda | 2 | Copyright (C) 1995-2023 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
3cf595e5 | 4 | |
478b92f0 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
3cf595e5 | 9 | |
478b92f0 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
3cf595e5 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
3cf595e5 RM |
18 | |
19 | ||
38e30b39 RM |
20 | /* Note that we must mark OPTION and TIMEOUT as outputs of this operation, |
21 | to indicate that the signal thread might mutate them as part | |
22 | of sending us to a signal handler. */ | |
5c81be53 | 23 | |
5c81be53 | 24 | #define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify, cancel_p, intr_port_p) \ |
3cf595e5 RM |
25 | ({ \ |
26 | error_t err; \ | |
5c81be53 | 27 | asm (".globl _hurd_intr_rpc_msg_about_to\n" \ |
3cf595e5 | 28 | ".globl _hurd_intr_rpc_msg_cx_sp\n" \ |
5c81be53 ST |
29 | ".globl _hurd_intr_rpc_msg_do_trap\n" \ |
30 | ".globl _hurd_intr_rpc_msg_in_trap\n" \ | |
3cf595e5 | 31 | ".globl _hurd_intr_rpc_msg_sp_restored\n" \ |
1d20f33f ST |
32 | "_hurd_intr_rpc_msg_about_to:" \ |
33 | /* We need to make a last check of cancel, in case we got interrupted | |
34 | right before _hurd_intr_rpc_msg_about_to. */ \ | |
35 | " cmpl $0, %5\n" \ | |
5c81be53 | 36 | " jz _hurd_intr_rpc_msg_do\n" \ |
1d20f33f | 37 | /* We got interrupted, note so and return EINTR. */ \ |
5c81be53 ST |
38 | " movl $0, %3\n" \ |
39 | " movl %6, %%eax\n" \ | |
40 | " jmp _hurd_intr_rpc_msg_sp_restored\n" \ | |
1d20f33f ST |
41 | "_hurd_intr_rpc_msg_do:" \ |
42 | /* Ok, push the mach_msg_trap arguments. */ \ | |
43 | " pushl 24(%4)\n" \ | |
44 | " .cfi_adjust_cfa_offset 4\n" \ | |
45 | " pushl %2\n" \ | |
46 | " .cfi_adjust_cfa_offset 4\n" \ | |
47 | " pushl 16(%4)\n" \ | |
48 | " .cfi_adjust_cfa_offset 4\n" \ | |
49 | " pushl 12(%4)\n" \ | |
50 | " .cfi_adjust_cfa_offset 4\n" \ | |
51 | " pushl 8(%4)\n" \ | |
52 | " .cfi_adjust_cfa_offset 4\n" \ | |
53 | " pushl %1\n" \ | |
54 | " .cfi_adjust_cfa_offset 4\n" \ | |
55 | " pushl (%4)\n" \ | |
56 | " .cfi_adjust_cfa_offset 4\n" \ | |
57 | " pushl $0\n" \ | |
58 | " .cfi_adjust_cfa_offset 4\n" \ | |
59 | /* TODO: remove this ecx kludge, we don't need it any more */ \ | |
60 | " movl %%esp, %%ecx\n" \ | |
3cf595e5 RM |
61 | "_hurd_intr_rpc_msg_cx_sp: movl $-25, %%eax\n" \ |
62 | "_hurd_intr_rpc_msg_do_trap: lcall $7, $0 # status in %0\n" \ | |
1d20f33f ST |
63 | "_hurd_intr_rpc_msg_in_trap:" \ |
64 | /* Ok, clean the arguments and update OPTION and TIMEOUT. */ \ | |
65 | " addl $8, %%esp\n" \ | |
66 | " .cfi_adjust_cfa_offset -8\n" \ | |
67 | " popl %1\n" \ | |
68 | " .cfi_adjust_cfa_offset -4\n" \ | |
69 | " addl $12, %%esp\n" \ | |
70 | " .cfi_adjust_cfa_offset -12\n" \ | |
71 | " popl %2\n" \ | |
72 | " .cfi_adjust_cfa_offset -4\n" \ | |
73 | " addl $4, %%esp\n" \ | |
74 | " .cfi_adjust_cfa_offset -4\n" \ | |
3cf595e5 | 75 | "_hurd_intr_rpc_msg_sp_restored:" \ |
1d20f33f ST |
76 | : "=a" (err), "+r" (option), "+r" (timeout), "=m" (*intr_port_p) \ |
77 | : "r" (&msg), "m" (*cancel_p), "i" (EINTR) \ | |
868df0f9 | 78 | : "ecx"); \ |
3cf595e5 RM |
79 | err; \ |
80 | }) | |
81 | ||
82 | ||
83 | static void inline | |
84 | INTR_MSG_BACK_OUT (struct i386_thread_state *state) | |
85 | { | |
86 | extern const void _hurd_intr_rpc_msg_cx_sp; | |
87 | if (state->eip >= (natural_t) &_hurd_intr_rpc_msg_cx_sp) | |
88 | state->uesp = state->ecx; | |
89 | else | |
90 | state->ecx = state->uesp; | |
91 | } | |
4ca84cff RM |
92 | \f |
93 | #include "hurdfault.h" | |
94 | ||
8a0746ae RM |
95 | /* This cannot be an inline function because it calls setjmp. */ |
96 | #define SYSCALL_EXAMINE(state, callno) \ | |
97 | ({ \ | |
98 | struct { unsigned int c[2]; } *p = (void *) ((state)->eip - 7); \ | |
99 | int result; \ | |
100 | if (_hurdsig_catch_memory_fault (p)) \ | |
101 | return 0; \ | |
102 | if (result = p->c[0] == 0x0000009a && (p->c[1] & 0x00ffffff) == 0x00000700) \ | |
103 | /* The PC is just after an `lcall $7,$0' instruction. \ | |
104 | This is a system call in progress; %eax holds the call number. */ \ | |
105 | *(callno) = (state)->eax; \ | |
106 | _hurdsig_end_catch_fault (); \ | |
107 | result; \ | |
108 | }) | |
4ca84cff RM |
109 | |
110 | ||
111 | struct mach_msg_trap_args | |
112 | { | |
113 | void *retaddr; /* Address mach_msg_trap will return to. */ | |
114 | /* This is the order of arguments to mach_msg_trap. */ | |
115 | mach_msg_header_t *msg; | |
116 | mach_msg_option_t option; | |
117 | mach_msg_size_t send_size; | |
118 | mach_msg_size_t rcv_size; | |
119 | mach_port_t rcv_name; | |
120 | mach_msg_timeout_t timeout; | |
121 | mach_port_t notify; | |
122 | }; | |
123 | ||
124 | ||
8a0746ae RM |
125 | /* This cannot be an inline function because it calls setjmp. */ |
126 | #define MSG_EXAMINE(state, msgid, rcvname, send_name, opt, tmout) \ | |
127 | ({ \ | |
128 | const struct mach_msg_trap_args *args = (const void *) (state)->uesp; \ | |
129 | mach_msg_header_t *msg; \ | |
130 | _hurdsig_catch_memory_fault (args) ? -1 : \ | |
131 | ({ \ | |
132 | msg = args->msg; \ | |
133 | *(opt) = args->option; \ | |
134 | *(tmout) = args->timeout; \ | |
135 | *(rcvname) = args->rcv_name; \ | |
136 | _hurdsig_end_catch_fault (); \ | |
137 | if (msg == 0) \ | |
138 | { \ | |
139 | *(send_name) = MACH_PORT_NULL; \ | |
140 | *(msgid) = 0; \ | |
141 | } \ | |
142 | else \ | |
143 | { \ | |
144 | if (_hurdsig_catch_memory_fault (msg)) \ | |
145 | return -1; \ | |
146 | *(send_name) = msg->msgh_remote_port; \ | |
147 | *(msgid) = msg->msgh_id; \ | |
148 | _hurdsig_end_catch_fault (); \ | |
149 | } \ | |
150 | 0; \ | |
151 | }); \ | |
152 | }) |