eacb50b8d9
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>
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/*
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* arm sysarch() system call emulation
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*
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* Copyright (c) 2013 Stacey D. Son
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _TARGET_ARCH_SIGTRAMP_H_
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#define _TARGET_ARCH_SIGTRAMP_H_
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/* Compare to arm/arm/locore.S ENTRY_NP(sigcode) */
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static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc,
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unsigned sys_sigreturn)
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{
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int i;
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uint32_t sys_exit = TARGET_FREEBSD_NR_exit;
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uint32_t sigtramp_code[] = {
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/* 1 */ 0xE1A0000D, /* mov r0, sp */
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/* 2 */ 0xE2800000 + sigf_uc, /* add r0, r0, #SIGF_UC */
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/* 3 */ 0xE59F700C, /* ldr r7, [pc, #12] */
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/* 4 */ 0xEF000000 + sys_sigreturn, /* swi (SYS_sigreturn) */
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/* 5 */ 0xE59F7008, /* ldr r7, [pc, #8] */
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/* 6 */ 0xEF000000 + sys_exit, /* swi (SYS_exit)*/
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/* 7 */ 0xEAFFFFFA, /* b . -16 */
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/* 8 */ sys_sigreturn,
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/* 9 */ sys_exit
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};
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G_STATIC_ASSERT(sizeof(sigtramp_code) == TARGET_SZSIGCODE);
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for (i = 0; i < 9; i++) {
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tswap32s(&sigtramp_code[i]);
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}
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return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
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}
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#endif /* _TARGET_ARCH_SIGTRAMP_H_ */
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