1 /* Modify saved context.
2 Copyright (C) 2009-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <sys/fpregdef.h>
22 #include <sys/regdef.h>
24 #include "ucontext_i.h"
26 /* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
34 LOCALSZ = 1 /* save gp */
36 #if _MIPS_SIM != _ABIO32
37 ARGSZ = 5 /* save a3-a7 */
42 FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
43 GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
44 #if _MIPS_SIM != _ABIO32
45 A3OFF = FRAMESZ - (5 * SZREG) /* callee-allocated */
46 A4OFF = FRAMESZ - (4 * SZREG)
47 A5OFF = FRAMESZ - (3 * SZREG)
48 A6OFF = FRAMESZ - (2 * SZREG)
49 A7OFF = FRAMESZ - (1 * SZREG)
52 A3OFF = FRAMESZ + (3 * SZREG) /* caller-allocated */
56 #if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
62 NESTED (__makecontext, FRAMESZ, ra)
63 .mask MASK, -(ARGSZ * SZREG)
71 PTR_ADDIU sp, -FRAMESZ
72 cfi_adjust_cfa_offset (FRAMESZ)
75 SETUP_GP64_STACK (GPOFF, __makecontext)
86 /* Store args to be passed. */
88 #if _MIPS_SIM != _ABIO32
95 /* Set up the stack. */
96 PTR_L t0, STACK_SP(a0)
97 PTR_L t2, STACK_SIZE(a0)
98 PTR_ADDIU t1, sp, A3OFF
101 blez a2, 2f /* no arguments */
103 /* Store register arguments. */
104 PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGOFF
111 PTR_ADDIU t2, MCONTEXT_GREGSZ
112 bgeu t3, a2, 2f /* all done */
113 bltu t3, NARGREGS, 0b /* next */
115 /* Make room for stack arguments. */
121 /* Store stack arguments. */
129 bltu t3, a2, 1b /* next */
132 #if _MIPS_SIM == _ABIO32
133 /* Make room for a0-a3 storage. */
134 PTR_ADDIU t0, -(NARGSAVE * SZREG)
136 PTR_L v1, UCONTEXT_LINK(a0)
138 PTR_ADDIU t9, 99f - 98b
143 REG_S t0, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
145 REG_S v1, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
148 REG_S gp, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
151 REG_S t9, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
152 REG_S a1, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
156 PTR_ADDIU sp, FRAMESZ
157 cfi_adjust_cfa_offset (-FRAMESZ)
161 /* We need to terminate the FDE to stop unwinding if backtrace was
162 called within a context created by makecontext. */
173 /* setcontext (ucp) */
176 PTR_LA t9, JUMPTARGET (__setcontext)
178 # if _MIPS_SIM == _ABIO32
182 jal JUMPTARGET (__setcontext)
189 PTR_LA t9, HIDDEN_JUMPTARGET (exit)
192 jal HIDDEN_JUMPTARGET (exit)
195 /* You don't exist, you won't feel anything. */
201 PSEUDO_END (__makecontext)
203 weak_alias (__makecontext, makecontext)