[Qemu-devel] [PATCH 30/34] linux-user: Support for restarting system calls for OpenRISC targets

[Timothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk>]

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
---

WARNING - NOT TESTED

 linux-user/main.c             | 22 ++++++++++++++--------
 linux-user/openrisc/syscall.h |  2 ++
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/linux-user/main.c b/linux-user/main.c
index 9ca1c99..b052e17 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2687,6 +2687,7 @@ void cpu_loop(CPUOpenRISCState *env)
 {
     CPUState *cs = CPU(openrisc_env_get_cpu(env));
     int trapnr, gdbsig;
+    abi_long ret;
 
     for (;;) {
         cpu_exec_start(cs);
@@ -2732,14 +2733,19 @@ void cpu_loop(CPUOpenRISCState *env)
             break;
         case EXCP_SYSCALL:
             env->pc += 4;   /* 0xc00; */
-            env->gpr[11] = do_syscall(env,
-                                      env->gpr[11], /* return value       */
-                                      env->gpr[3],  /* r3 - r7 are params */
-                                      env->gpr[4],
-                                      env->gpr[5],
-                                      env->gpr[6],
-                                      env->gpr[7],
-                                      env->gpr[8], 0, 0);
+            ret = do_syscall(env,
+                             env->gpr[11], /* return value       */
+                             env->gpr[3],  /* r3 - r7 are params */
+                             env->gpr[4],
+                             env->gpr[5],
+                             env->gpr[6],
+                             env->gpr[7],
+                             env->gpr[8], 0, 0);
+            if (ret == -TARGET_ERESTARTSYS) {
+                env->pc -= 4;
+            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
+                env->gpr[11] = ret;
+            }
             break;
         case EXCP_FPE:
             qemu_log("\nFloating point error\n");
diff --git a/linux-user/openrisc/syscall.h b/linux-user/openrisc/syscall.h
index 8ac0365..74787ed 100644
--- a/linux-user/openrisc/syscall.h
+++ b/linux-user/openrisc/syscall.h
@@ -27,3 +27,5 @@ struct target_pt_regs {
 #define TARGET_MINSIGSTKSZ 2048
 #define TARGET_MLOCKALL_MCL_CURRENT 1
 #define TARGET_MLOCKALL_MCL_FUTURE  2
+
+#define TARGET_USE_ERESTARTSYS 1
-- 
2.1.4