Implement set_sigtramp_args to setup the arguments to the sigtramp
calls.
Signed-off-by: Stacey Son <s...@freebsd.org>
Signed-off-by: Warner Losh <i...@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
