diff mbox series

[16/16] bsd-user: Implement SIGSYS on arm

Message ID 20230405213612.15942-17-imp@bsdimp.com (mailing list archive)
State New, archived
Headers show
Series bsd-user 2023 Q2 first batch | expand

Commit Message

Warner Losh April 5, 2023, 9:36 p.m. UTC 
When a system call returns ENOSYS, send a SIGSYS to the process (to
generate a core dump).

Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/arm/target_arch_cpu.h | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Richard Henderson April 8, 2023, 7:16 p.m. UTC | #1 
On 4/5/23 14:36, Warner Losh wrote:
> When a system call returns ENOSYS, send a SIGSYS to the process (to
> generate a core dump).
> 
> Signed-off-by: Warner Losh<imp@bsdimp.com>
> ---
>   bsd-user/arm/target_arch_cpu.h | 8 ++++++++
>   1 file changed, 8 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~
diff mbox series

Patch

diff --git a/bsd-user/arm/target_arch_cpu.h b/bsd-user/arm/target_arch_cpu.h
index 517d0087644..c4b21fef713 100644
--- a/bsd-user/arm/target_arch_cpu.h
+++ b/bsd-user/arm/target_arch_cpu.h
@@ -127,6 +127,14 @@  static inline void target_cpu_loop(CPUARMState *env)
                     env->regs[15] -= env->thumb ? 2 : 4;
                     break;
                 }
+                /*
+                 * Emulate BSD's sigsys behavior on unimplemented system calls.
+                 * XXX may need to gate this somehow or arrange for sigsys to be
+                 * masked in some use cases.
+                 */
+                if (ret == -TARGET_ENOSYS) {
+                    force_sig_fault(TARGET_SIGSYS, SI_KERNEL, env->regs[15]);
+                }
                 if ((unsigned int)ret >= (unsigned int)(-515)) {
                     ret = -ret;
                     cpsr_write(env, CPSR_C, CPSR_C, CPSRWriteByInstr);