linux-user/loongarch64: Decode BRK break codes for FPE signals

Commit Message

WANG Rui April 14, 2025, 7:49 a.m. UTC

Handle specific LoongArch BRK break codes in user-mode emulation
to deliver accurate floating-point exception signals. Specifically,
BRK_OVERFLOW (6) triggers TARGET_FPE_INTOVF, and BRK_DIVZERO (7)
triggers TARGET_FPE_INTDIV. Other BRK codes fall back to a generic
SIGTRAP.

This improves correctness for programs that rely on BRK to signal
overflow or divide-by-zero conditions.

Signed-off-by: WANG Rui <[e-mail]>
---
 linux-user/loongarch64/cpu_loop.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

Patch

diff --git a/linux-user/loongarch64/cpu_loop.c b/linux-user/loongarch64/cpu_loop.c
index 0614d3de22..ec8a06c88c 100644
--- a/linux-user/loongarch64/cpu_loop.c
+++ b/linux-user/loongarch64/cpu_loop.c
@@ -11,6 +11,12 @@ 
 #include "user/cpu_loop.h"
 #include "signal-common.h"
 
+/* Break codes */
+enum {
+    BRK_OVERFLOW = 6,
+    BRK_DIVZERO = 7
+};
+
 void cpu_loop(CPULoongArchState *env)
 {
     CPUState *cs = env_cpu(env);
@@ -66,9 +72,26 @@  void cpu_loop(CPULoongArchState *env)
             force_sig_fault(TARGET_SIGFPE, si_code, env->pc);
             break;
         case EXCP_DEBUG:
-        case EXCCODE_BRK:
             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
             break;
+        case EXCCODE_BRK:
+            {
+                unsigned int opcode;
+
+                get_user_u32(opcode, env->pc);
+
+                switch (opcode & 0x7fff) {
+                case BRK_OVERFLOW:
+                    force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc);
+                    break;
+                case BRK_DIVZERO:
+                    force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc);
+                    break;
+                default:
+                    force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
+                }
+            }
+            break;
         case EXCCODE_BCE:
             force_sig_fault(TARGET_SIGSYS, TARGET_SI_KERNEL, env->pc);
             break;