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[PATCH v5 24/37] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline
From: |
Warner Losh |
Subject: |
[PATCH v5 24/37] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm |
Date: |
Sun, 7 Nov 2021 20:51:23 -0700 |
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>
---
bsd-user/arm/target_arch_sigtramp.h | 49 +++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
create mode 100644 bsd-user/arm/target_arch_sigtramp.h
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_ */
--
2.33.0
- [PATCH v5 00/37] bsd-user: arm (32-bit) support, Warner Losh, 2021/11/07
- [PATCH v5 11/37] bsd-user/x86_64: Move functions into signal.c, Warner Losh, 2021/11/07
- [PATCH v5 24/37] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm,
Warner Losh <=
- [PATCH v5 01/37] bsd-user/mips*: Remove mips support, Warner Losh, 2021/11/07
- [PATCH v5 07/37] bsd-user/i386: Move the inlines into signal.c, Warner Losh, 2021/11/07
- [PATCH v5 12/37] bsd-user/target_os_signal.h: Move signal prototypes to target_os_ucontext.h, Warner Losh, 2021/11/07
- [PATCH v5 26/37] bsd-user/arm/target_arch_elf.h: arm defines for ELF, Warner Losh, 2021/11/07
- [PATCH v5 33/37] bsd-user/arm/signal.c: arm get_mcontext, Warner Losh, 2021/11/07
- [PATCH v5 05/37] bsd-user/i386/target_arch_signal.h: use new target_os_ucontext.h, Warner Losh, 2021/11/07
- [PATCH v5 06/37] bsd-user/i386/target_arch_signal.h: Update mcontext_t to match FreeBSD, Warner Losh, 2021/11/07
- [PATCH v5 27/37] bsd-user/arm/target_arch_elf.h: arm get hwcap, Warner Losh, 2021/11/07
- [PATCH v5 08/37] bsd-user/x86_64/target_arch_signal.h: Remove target_sigcontext, Warner Losh, 2021/11/07
- [PATCH v5 10/37] bsd-user/x86_64/target_arch_signal.h: Fill in mcontext_t, Warner Losh, 2021/11/07