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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>
This commit is contained in:
Warner Losh 2021-09-23 09:14:08 -06:00
parent dacfdf3ba4
commit eacb50b8d9
1 changed files with 49 additions and 0 deletions
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bsd-user/arm/target_arch_sigtramp.h Normal file
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/*
* 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_ */