On 10/19/21 9:44 AM, Warner Losh wrote:
+/* Compare to arm/arm/machdep.c sys_sigreturn() */
+static inline abi_long get_ucontext_sigreturn(CPUARMState *regs,
+ abi_ulong target_sf, abi_ulong *target_uc)
+{
+ uint32_t cpsr = cpsr_read(regs);
+
+ *target_uc = 0;
+
+ if ((cpsr & CPSR_M) != ARM_CPU_MODE_USR ||
+ (cpsr & (CPSR_I | CPSR_F)) != 0) {
+ return -TARGET_EINVAL;
+ }
+
+ *target_uc = target_sf;
+
+ return 0;
+}
Since you've not yet filled in signal.c, I can't opine too much, but I'll note that the
kernel has this check in set_mcontext, and sys_sigreturn defers to that for the validation.
So I think this can just be the final assignment.
r~
