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[PATCH v2 22/30] bsd-user/arm/target_arch_signal.h: arm set_sigtramp_arg
From: |
Warner Losh |
Subject: |
[PATCH v2 22/30] bsd-user/arm/target_arch_signal.h: arm set_sigtramp_args |
Date: |
Tue, 2 Nov 2021 16:52:40 -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>
---
bsd-user/arm/target_arch_signal.h | 47 +++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/bsd-user/arm/target_arch_signal.h
b/bsd-user/arm/target_arch_signal.h
index 4bdfcbb8d7..61440b51b4 100644
--- a/bsd-user/arm/target_arch_signal.h
+++ b/bsd-user/arm/target_arch_signal.h
@@ -82,4 +82,51 @@ struct target_sigframe {
target_mcontext_vfp_t sf_vfp; /* actual saved VFP context */
};
+/*
+ * Compare to arm/arm/machdep.c sendsig()
+ * Assumes that target stack frame memory is locked.
+ */
+static inline abi_long
+set_sigtramp_args(CPUARMState *env, int sig, struct target_sigframe *frame,
+ abi_ulong frame_addr, struct target_sigaction *ka)
+{
+ abi_ulong cpsr;
+
+ /*
+ * 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 = cpsr_read(env);
+ if (ka->_sa_handler & 1) {
+ cpsr |= CPSR_T;
+ } else {
+ cpsr &= ~CPSR_T;
+ }
+ cpsr_write(env, cpsr, CPSR_T, CPSRWriteByInstr);
+
+ return 0;
+}
+
#endif /* !_TARGET_ARCH_SIGNAL_H_ */
--
2.33.0
- [PATCH v2 12/30] bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space, (continued)
- [PATCH v2 12/30] bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space, Warner Losh, 2021/11/02
- [PATCH v2 13/30] bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm, Warner Losh, 2021/11/02
- [PATCH v2 14/30] bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread, Warner Losh, 2021/11/02
- [PATCH v2 15/30] bsd-user/arm/target_arch_elf.h: arm defines for ELF, Warner Losh, 2021/11/02
- [PATCH v2 17/30] bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl, Warner Losh, 2021/11/02
- [PATCH v2 19/30] bsd-user/arm/target_arch_signal.h: arm specific signal registers and stack, Warner Losh, 2021/11/02
- [PATCH v2 18/30] bsd-user/freebsd: Create common target_os_ucontext.h file, Warner Losh, 2021/11/02
- [PATCH v2 22/30] bsd-user/arm/target_arch_signal.h: arm set_sigtramp_args,
Warner Losh <=
- [PATCH v2 20/30] bsd-user/arm/target_arch_signal.h: arm machine context for signals, Warner Losh, 2021/11/02
- [PATCH v2 21/30] bsd-user/arm/target_arch_signal.h: arm user context and trapframe for signals, Warner Losh, 2021/11/02
- [PATCH v2 23/30] bsd-user/arm/target_arch_signal.h: arm get_mcontext, Warner Losh, 2021/11/02
- [PATCH v2 26/30] bsd-user: add arm target build, Warner Losh, 2021/11/02