[PULL 10/30] linux-user/i386: Use force_sig, force_sig_fault

[Laurent Vivier <laurent@vivier.eu>]

From: Richard Henderson <richard.henderson@linaro.org>

Replace the local gen_signal with the generic functions that match
how the kernel raises signals. Fill in the missing PC for SIGTRAP.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-11-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/i386/cpu_loop.c | 47 +++++++++++++++-----------------------
 1 file changed, 18 insertions(+), 29 deletions(-)

diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c
index ac0f4e321111..29dfd7cd0c54 100644
--- a/linux-user/i386/cpu_loop.c
+++ b/linux-user/i386/cpu_loop.c
@@ -84,17 +84,6 @@ static void set_idt(int n, unsigned int dpl)
 }
 #endif
 
-static void gen_signal(CPUX86State *env, int sig, int code, abi_ptr addr)
-{
-    target_siginfo_t info = {
-        .si_signo = sig,
-        .si_code = code,
-        ._sifields._sigfault._addr = addr
-    };
-
-    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
-}
-
 #ifdef TARGET_X86_64
 static bool write_ok_or_segv(CPUX86State *env, abi_ptr addr, size_t len)
 {
@@ -107,7 +96,7 @@ static bool write_ok_or_segv(CPUX86State *env, abi_ptr addr, size_t len)
     }
 
     env->error_code = PG_ERROR_W_MASK | PG_ERROR_U_MASK;
-    gen_signal(env, TARGET_SIGSEGV, TARGET_SEGV_MAPERR, addr);
+    force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, addr);
     return false;
 }
 
@@ -193,8 +182,7 @@ static void emulate_vsyscall(CPUX86State *env)
     return;
 
  sigsegv:
-    /* Like force_sig(SIGSEGV).  */
-    gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0);
+    force_sig(TARGET_SIGSEGV);
 }
 #endif
 
@@ -266,53 +254,54 @@ void cpu_loop(CPUX86State *env)
 #endif
         case EXCP0B_NOSEG:
         case EXCP0C_STACK:
-            gen_signal(env, TARGET_SIGBUS, TARGET_SI_KERNEL, 0);
+            force_sig(TARGET_SIGBUS);
             break;
         case EXCP0D_GPF:
             /* XXX: potential problem if ABI32 */
             if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-            gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0);
+            force_sig(TARGET_SIGSEGV);
             break;
         case EXCP0E_PAGE:
-            gen_signal(env, TARGET_SIGSEGV,
-                       (env->error_code & 1 ?
-                        TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR),
-                       env->cr[2]);
+            force_sig_fault(TARGET_SIGSEGV,
+                            (env->error_code & PG_ERROR_P_MASK ?
+                             TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR),
+                            env->cr[2]);
             break;
         case EXCP00_DIVZ:
             if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-            gen_signal(env, TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip);
+            force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip);
             break;
         case EXCP01_DB:
-        case EXCP03_INT3:
             if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-            if (trapnr == EXCP01_DB) {
-                gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip);
-            } else {
-                gen_signal(env, TARGET_SIGTRAP, TARGET_SI_KERNEL, 0);
+            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip);
+            break;
+        case EXCP03_INT3:
+            if (maybe_handle_vm86_trap(env, trapnr)) {
+                break;
             }
+            force_sig(TARGET_SIGTRAP);
             break;
         case EXCP04_INTO:
         case EXCP05_BOUND:
             if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-            gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0);
+            force_sig(TARGET_SIGSEGV);
             break;
         case EXCP06_ILLOP:
-            gen_signal(env, TARGET_SIGILL, TARGET_ILL_ILLOPN, env->eip);
+            force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->eip);
             break;
         case EXCP_INTERRUPT:
             /* just indicate that signals should be handled asap */
             break;
         case EXCP_DEBUG:
-            gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0);
+            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip);
             break;
         case EXCP_ATOMIC:
             cpu_exec_step_atomic(cs);
-- 
2.33.1