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[PATCH 12/24] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for
From: |
Warner Losh |
Subject: |
[PATCH 12/24] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm |
Date: |
Tue, 19 Oct 2021 10:44:35 -0600 |
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>
---
bsd-user/arm/target_arch_sigtramp.h | 52 +++++++++++++++++++++++++++++
1 file changed, 52 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..ed53d336ed
--- /dev/null
+++ b/bsd-user/arm/target_arch_sigtramp.h
@@ -0,0 +1,52 @@
+/*
+ * 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;
+ /*
+ * The code has to load r7 manually rather than using
+ * "ldr r7, =SYS_return to make sure the size of the
+ * code is correct.
+ */
+ 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
+ };
+
+ for (i = 0; i < 9; i++) {
+ tswap32s(&sigtramp_code[i]);
+ }
+
+ return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
+}
+#endif /* _TARGET_ARCH_SIGTRAMP_H_ */
--
2.32.0
- Re: [PATCH 13/24] bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread, (continued)