diff mbox series

[PULL,39/60] semihosting: Create semihost_sys_gettimeofday

Message ID 20220628045403.508716-40-richard.henderson@linaro.org
State New
Headers show
Series [PULL,01/60] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h | expand

Commit Message

Richard Henderson June 28, 2022, 4:53 a.m. UTC 
This syscall will be used by m68k and nios2 semihosting.

Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/semihosting/syscalls.h |  3 +++
 semihosting/syscalls.c         | 42 ++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
diff mbox series

Patch

diff --git a/include/semihosting/syscalls.h b/include/semihosting/syscalls.h
index ecc97751a9..347200cb9f 100644
--- a/include/semihosting/syscalls.h
+++ b/include/semihosting/syscalls.h
@@ -66,4 +66,7 @@  void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
 void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
                          target_ulong cmd, target_ulong cmd_len);
 
+void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+                               target_ulong tv_addr, target_ulong tz_addr);
+
 #endif /* SEMIHOSTING_SYSCALLS_H */
diff --git a/semihosting/syscalls.c b/semihosting/syscalls.c
index d21064716d..db1e9f6cc9 100644
--- a/semihosting/syscalls.c
+++ b/semihosting/syscalls.c
@@ -236,6 +236,12 @@  static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete,
     gdb_do_syscall(complete, "system,%s", cmd, len);
 }
 
+static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+                             target_ulong tv_addr, target_ulong tz_addr)
+{
+    gdb_do_syscall(complete, "gettimeofday,%x,%x", tv_addr, tz_addr);
+}
+
 /*
  * Host semihosting syscall implementations.
  */
@@ -487,6 +493,32 @@  static void host_system(CPUState *cs, gdb_syscall_complete_cb complete,
     unlock_user(p, cmd, 0);
 }
 
+static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+                              target_ulong tv_addr, target_ulong tz_addr)
+{
+    CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+    struct gdb_timeval *p;
+    int64_t rt;
+
+    /* GDB fails on non-null TZ, so be consistent. */
+    if (tz_addr != 0) {
+        complete(cs, -1, EINVAL);
+        return;
+    }
+
+    p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0);
+    if (!p) {
+        complete(cs, -1, EFAULT);
+        return;
+    }
+
+    /* TODO: Like stat, gdb always produces big-endian results; match it. */
+    rt = g_get_real_time();
+    p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
+    p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
+    unlock_user(p, tv_addr, sizeof(struct gdb_timeval));
+}
+
 /*
  * Static file semihosting syscall implementations.
  */
@@ -796,3 +828,13 @@  void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
         host_system(cs, complete, cmd, cmd_len);
     }
 }
+
+void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+                               target_ulong tv_addr, target_ulong tz_addr)
+{
+    if (use_gdb_syscalls()) {
+        gdb_gettimeofday(cs, complete, tv_addr, tz_addr);
+    } else {
+        host_gettimeofday(cs, complete, tv_addr, tz_addr);
+    }
+}