diff mbox series

[7/8] semihosting: Implement SYS_TMPNAM

Message ID 20201125213617.2496935-8-keithp@keithp.com (mailing list archive)
State New, archived
Headers show
Series Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0 | expand

Commit Message

Keith Packard Nov. 25, 2020, 9:36 p.m. UTC 
Part of Semihosting for AArch32 and AArch64 Release 2.0

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 hw/semihosting/common-semi.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index c84b0d906b..9a04d98e4e 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -830,6 +830,7 @@  target_ulong do_common_semihosting(CPUState *cs)
     CPUArchState *env = cs->env_ptr;
     target_ulong args;
     target_ulong arg0, arg1, arg2, arg3;
+    target_ulong ul_ret;
     char * s;
     int nr;
     uint32_t ret;
@@ -993,8 +994,24 @@  target_ulong do_common_semihosting(CPUState *cs)
 
         return guestfd_fns[gf->type].flenfn(cs, gf);
     case TARGET_SYS_TMPNAM:
-        qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
-        return -1;
+        GET_ARG(0);
+        GET_ARG(1);
+        GET_ARG(2);
+        if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+                     (int) (arg1 & 0xff)) < 0) {
+            return -1;
+        }
+        ul_ret = (target_ulong) -1;
+
+        /* Make sure there's enough space in the buffer */
+        if (strlen(s) < arg2) {
+            char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+            strcpy(output, s);
+            unlock_user(output, arg0, arg2);
+            ul_ret = 0;
+        }
+        free(s);
+        return ul_ret;
     case TARGET_SYS_REMOVE:
         GET_ARG(0);
         GET_ARG(1);