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>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/qemu.h | 12 ++++++++----
linux-user/elfload.c | 10 ++++++----
linux-user/linuxload.c | 12 ++++++++++--
linux-user/main.c | 4 ++--
semihosting/arm-compat-semi.c | 4 ++--
5 files changed, 28 insertions(+), 14 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;
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 61063fd974..8c0765dd4b 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1516,8 +1516,8 @@ static inline void init_thread(struct target_pt_regs
*regs,
regs->iaoq[0] = infop->entry;
regs->iaoq[1] = infop->entry + 4;
regs->gr[23] = 0;
- regs->gr[24] = infop->arg_start;
- regs->gr[25] = (infop->arg_end - infop->arg_start) / sizeof(abi_ulong);
+ regs->gr[24] = infop->argv;
+ regs->gr[25] = infop->argc;
/* The top-of-stack contains a linkage buffer. */
regs->gr[30] = infop->start_stack + 64;
regs->gr[31] = infop->entry;
@@ -2120,8 +2120,10 @@ static abi_ulong create_elf_tables(abi_ulong p, int
argc, int envc,
u_envp = u_argv + (argc + 1) * n;
u_auxv = u_envp + (envc + 1) * n;
info->saved_auxv = u_auxv;
- info->arg_start = u_argv;
- info->arg_end = u_argv + argc * n;
+ info->argc = argc;
+ info->envc = envc;
+ info->argv = u_argv;
+ info->envp = u_envp;
/* This is correct because Linux defines
* elf_addr_t as Elf32_Off / Elf64_Off
diff --git a/linux-user/linuxload.c b/linux-user/linuxload.c
index 2ed5fc45ed..745cce70ab 100644
--- a/linux-user/linuxload.c
+++ b/linux-user/linuxload.c
@@ -92,6 +92,11 @@ abi_ulong loader_build_argptr(int envc, int argc, abi_ulong
sp,
envp = sp;
sp -= (argc + 1) * n;
argv = sp;
+ ts->info->envp = envp;
+ ts->info->envc = envc;
+ ts->info->argv = argv;
+ ts->info->argc = argc;
+
if (push_ptr) {
/* FIXME - handle put_user() failures */
sp -= n;
@@ -99,19 +104,22 @@ abi_ulong loader_build_argptr(int envc, int argc,
abi_ulong sp,
sp -= n;
put_user_ual(argv, sp);
}
+
sp -= n;
/* FIXME - handle put_user() failures */
put_user_ual(argc, sp);
- ts->info->arg_start = stringp;
+
+ ts->info->arg_strings = stringp;
while (argc-- > 0) {
/* FIXME - handle put_user() failures */
put_user_ual(stringp, argv);
argv += n;
stringp += target_strlen(stringp) + 1;
}
- ts->info->arg_end = stringp;
/* FIXME - handle put_user() failures */
put_user_ual(0, argv);
+
+ ts->info->env_strings = stringp;
while (envc-- > 0) {
/* FIXME - handle put_user() failures */
put_user_ual(stringp, envp);
diff --git a/linux-user/main.c b/linux-user/main.c
index 7ca48664e4..651e32f5f2 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -878,9 +878,9 @@ int main(int argc, char **argv, char **envp)
fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n",
info->entry);
fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n",
- info->arg_start);
+ info->argv);
fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n",
- info->arg_end + (abi_ulong)sizeof(abi_ulong));
+ info->envp);
fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n",
info->saved_auxv);
qemu_log_unlock(f);
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 7a51fd0737..b6ddaf863a 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -1106,7 +1106,7 @@ target_ulong do_common_semihosting(CPUState *cs)
#else
unsigned int i;
- output_size = ts->info->arg_end - ts->info->arg_start;
+ output_size = ts->info->env_strings - ts->info->arg_strings;
if (!output_size) {
/*
* We special-case the "empty command line" case (argc==0).
@@ -1146,7 +1146,7 @@ target_ulong do_common_semihosting(CPUState *cs)
goto out;
}
- if (copy_from_user(output_buffer, ts->info->arg_start,
+ if (copy_from_user(output_buffer, ts->info->arg_strings,
output_size)) {
errno = EFAULT;
status = set_swi_errno(cs, -1);