linux-user: Clean up arg_start/arg_end confusion

We had two sets of variables: arg_start/arg_end, and
arg_strings/env_strings.  In linuxload.c, we set the
first pair to the bounds of the argv strings, but in
elfload.c, we set the first pair to the bounds of the
argv pointers and the second pair to the bounds of
the argv strings.

Remove arg_start/arg_end, replacing them with the standard
argc/argv/envc/envp values.  Retain arg_strings/env_strings
with the meaning we were using in elfload.c.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/714
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220427025129.160184-1-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 8 insertions, 4 deletions

diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 46550f5e21..7d90de1b15 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -40,15 +40,19 @@ struct image_info {
         abi_ulong       data_offset;
         abi_ulong       saved_auxv;
         abi_ulong       auxv_len;
-        abi_ulong       arg_start;
-        abi_ulong       arg_end;
-        abi_ulong       arg_strings;
-        abi_ulong       env_strings;
+        abi_ulong       argc;
+        abi_ulong       argv;
+        abi_ulong       envc;
+        abi_ulong       envp;
         abi_ulong       file_string;
         uint32_t        elf_flags;
         int             personality;
         abi_ulong       alignment;
 
+        /* Generic semihosting knows about these pointers. */
+        abi_ulong       arg_strings;   /* strings for argv */
+        abi_ulong       env_strings;   /* strings for envp; ends arg_strings */
+
         /* The fields below are used in FDPIC mode.  */
         abi_ulong       loadmap_addr;
         uint16_t        nsegs;