diff options
| author | Warner Losh <imp@bsdimp.com> | 2021-09-23 09:14:08 -0600 |
|---|---|---|
| committer | Warner Losh <imp@bsdimp.com> | 2022-01-07 22:58:51 -0700 |
| commit | eacb50b8d92452251d890f6bfb4ac8eb22acb8d2 (patch) | |
| tree | f7666f97eabc1a83918e06d5e253308b0c6a4d74 /bsd-user/arm | |
| parent | dacfdf3ba4ac0773a92472d5063166b1553dff59 (diff) | |
bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm
Copy of the signal trampoline code for arm, as well as setup_sigtramp to
write it to the stack.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'bsd-user/arm')
| -rw-r--r-- | bsd-user/arm/target_arch_sigtramp.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/bsd-user/arm/target_arch_sigtramp.h b/bsd-user/arm/target_arch_sigtramp.h new file mode 100644 index 0000000000..5d434a9e7e --- /dev/null +++ b/bsd-user/arm/target_arch_sigtramp.h @@ -0,0 +1,49 @@ +/* + * arm sysarch() system call emulation + * + * Copyright (c) 2013 Stacey D. Son + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _TARGET_ARCH_SIGTRAMP_H_ +#define _TARGET_ARCH_SIGTRAMP_H_ + +/* Compare to arm/arm/locore.S ENTRY_NP(sigcode) */ +static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc, + unsigned sys_sigreturn) +{ + int i; + uint32_t sys_exit = TARGET_FREEBSD_NR_exit; + uint32_t sigtramp_code[] = { + /* 1 */ 0xE1A0000D, /* mov r0, sp */ + /* 2 */ 0xE2800000 + sigf_uc, /* add r0, r0, #SIGF_UC */ + /* 3 */ 0xE59F700C, /* ldr r7, [pc, #12] */ + /* 4 */ 0xEF000000 + sys_sigreturn, /* swi (SYS_sigreturn) */ + /* 5 */ 0xE59F7008, /* ldr r7, [pc, #8] */ + /* 6 */ 0xEF000000 + sys_exit, /* swi (SYS_exit)*/ + /* 7 */ 0xEAFFFFFA, /* b . -16 */ + /* 8 */ sys_sigreturn, + /* 9 */ sys_exit + }; + + G_STATIC_ASSERT(sizeof(sigtramp_code) == TARGET_SZSIGCODE); + + for (i = 0; i < 9; i++) { + tswap32s(&sigtramp_code[i]); + } + + return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE); +} +#endif /* _TARGET_ARCH_SIGTRAMP_H_ */ |