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[PATCH v4 31/36] bsd-user/arm/target_arch_signal.c: arm set_sigtramp_arg
From: |
Warner Losh |
Subject: |
[PATCH v4 31/36] bsd-user/arm/target_arch_signal.c: arm set_sigtramp_args |
Date: |
Thu, 4 Nov 2021 21:19:12 -0600 |
Implement set_sigtramp_args to setup the arguments to the sigtramp
calls.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
bsd-user/arm/signal.c | 60 +++++++++++++++++++++++++++++++
bsd-user/arm/target_arch_signal.h | 5 +++
2 files changed, 65 insertions(+)
create mode 100644 bsd-user/arm/signal.c
diff --git a/bsd-user/arm/signal.c b/bsd-user/arm/signal.c
new file mode 100644
index 0000000000..3c0db30a85
--- /dev/null
+++ b/bsd-user/arm/signal.c
@@ -0,0 +1,60 @@
+/*
+ * arm signal functions
+ *
+ * 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/>.
+ */
+
+#include "qemu.h"
+
+/*
+ * Compare to arm/arm/machdep.c sendsig()
+ * Assumes that target stack frame memory is locked.
+ */
+abi_long set_sigtramp_args(CPUARMState *env, int sig,
+ struct target_sigframe *frame,
+ abi_ulong frame_addr,
+ struct target_sigaction *ka)
+{
+ /*
+ * Arguments to signal handler:
+ * r0 = signal number
+ * r1 = siginfo pointer
+ * r2 = ucontext pointer
+ * r5 = ucontext pointer
+ * pc = signal handler pointer
+ * sp = sigframe struct pointer
+ * lr = sigtramp at base of user stack
+ */
+
+ env->regs[0] = sig;
+ env->regs[1] = frame_addr +
+ offsetof(struct target_sigframe, sf_si);
+ env->regs[2] = frame_addr +
+ offsetof(struct target_sigframe, sf_uc);
+
+ /* the trampoline uses r5 as the uc address */
+ env->regs[5] = frame_addr +
+ offsetof(struct target_sigframe, sf_uc);
+ env->regs[TARGET_REG_PC] = ka->_sa_handler & ~1;
+ env->regs[TARGET_REG_SP] = frame_addr;
+ env->regs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
+ /*
+ * Low bit indicates whether or not we're entering thumb mode.
+ */
+ cpsr_write(env, (ka->_sa_handler & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr);
+
+ return 0;
+}
diff --git a/bsd-user/arm/target_arch_signal.h
b/bsd-user/arm/target_arch_signal.h
index f1844dbf22..8286aa5d6e 100644
--- a/bsd-user/arm/target_arch_signal.h
+++ b/bsd-user/arm/target_arch_signal.h
@@ -85,4 +85,9 @@ struct target_sigframe {
target_mcontext_vfp_t sf_vfp; /* actual saved VFP context */
};
+abi_long set_sigtramp_args(CPUARMState *regs, int sig,
+ struct target_sigframe *frame,
+ abi_ulong frame_addr,
+ struct target_sigaction *ka);
+
#endif /* !_TARGET_ARCH_SIGNAL_H_ */
--
2.33.0
- [PATCH v4 20/36] bsd-user/arm/target_arch_cpu.h: Implement system call dispatch, (continued)
- [PATCH v4 20/36] bsd-user/arm/target_arch_cpu.h: Implement system call dispatch, Warner Losh, 2021/11/04
- [PATCH v4 24/36] bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread, Warner Losh, 2021/11/04
- [PATCH v4 29/36] bsd-user/arm/target_arch_signal.h: arm machine context and trapframe for signals, Warner Losh, 2021/11/04
- [PATCH v4 21/36] bsd-user/arm/target_arch_reg.h: Implement core dump register copying, Warner Losh, 2021/11/04
- [PATCH v4 25/36] bsd-user/arm/target_arch_elf.h: arm defines for ELF, Warner Losh, 2021/11/04
- [PATCH v4 27/36] bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl, Warner Losh, 2021/11/04
- [PATCH v4 28/36] bsd-user/arm/target_arch_signal.h: arm specific signal registers and stack, Warner Losh, 2021/11/04
- [PATCH v4 30/36] bsd-user/arm/target_arch_signal.h: Define size of *context_t, Warner Losh, 2021/11/04
- [PATCH v4 31/36] bsd-user/arm/target_arch_signal.c: arm set_sigtramp_args,
Warner Losh <=
- [PATCH v4 32/36] bsd-user/arm/target_arch_signal.c: arm get_mcontext, Warner Losh, 2021/11/04
- [PATCH v4 35/36] bsd-user/freebsd/target_os_ucontext.h: Require TARGET_*CONTEXT_SIZE, Warner Losh, 2021/11/04
- [PATCH v4 34/36] bsd-user/arm/target_arch_signal.c: arm get_ucontext_sigreturn, Warner Losh, 2021/11/04
- [PATCH v4 36/36] bsd-user: add arm target build, Warner Losh, 2021/11/04