From c805e118754a2c90c29219985ba389829d4a53a4 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 7 Jun 2022 12:38:26 -0700
Subject: [PATCH] gdbstub: Convert GDB error numbers to host error numbers

Provide the callback with consistent state -- always use
host error numbers.  The individual callback can then
decide if the errno requires conversion for the guest.

Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 gdbstub.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gdbstub.c b/gdbstub.c
index 88a34c8f52..f3a4664453 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1886,6 +1886,37 @@ static void handle_file_io(GArray *params, void *user_ctx)
         } else {
             err = 0;
         }
+
+        /* Convert GDB error numbers back to host error numbers. */
+#define E(X)  case GDB_E##X: err = E##X; break
+        switch (err) {
+        case 0:
+            break;
+        E(PERM);
+        E(NOENT);
+        E(INTR);
+        E(BADF);
+        E(ACCES);
+        E(FAULT);
+        E(BUSY);
+        E(EXIST);
+        E(NODEV);
+        E(NOTDIR);
+        E(ISDIR);
+        E(INVAL);
+        E(NFILE);
+        E(MFILE);
+        E(FBIG);
+        E(NOSPC);
+        E(SPIPE);
+        E(ROFS);
+        E(NAMETOOLONG);
+        default:
+            err = EINVAL;
+            break;
+        }
+#undef E
+
         gdbserver_state.current_syscall_cb(gdbserver_state.c_cpu, ret, err);
         gdbserver_state.current_syscall_cb = NULL;
     }