linux-user/qemu.h | 12 ++++++++---- linux-user/elfload.c | 10 ++++++---- linux-user/linuxload.c | 18 ++++++++++-------- linux-user/main.c | 5 ++--- semihosting/arm-compat-semi.c | 4 ++-- 5 files changed, 28 insertions(+), 21 deletions(-)
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.
Update linuxload.c, elfload.c, and arm-compat-semi.c to match.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/714
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/qemu.h | 12 ++++++++----
linux-user/elfload.c | 10 ++++++----
linux-user/linuxload.c | 18 ++++++++++--------
linux-user/main.c | 5 ++---
semihosting/arm-compat-semi.c | 4 ++--
5 files changed, 28 insertions(+), 21 deletions(-)
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 98dfbf2096..3ac39793e1 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 9628a38361..828ac2d8db 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1517,8 +1517,8 @@ 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;
@@ -2121,8 +2121,10 @@ 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..eb010b0109 100644
--- a/linux-user/linuxload.c
+++ b/linux-user/linuxload.c
@@ -92,33 +92,35 @@ 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;
put_user_ual(envp, 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);
envp += n;
stringp += target_strlen(stringp) + 1;
}
- /* FIXME - handle put_user() failures */
put_user_ual(0, envp);
return sp;
diff --git a/linux-user/main.c b/linux-user/main.c
index fbc9bcfd5f..8995379aa3 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -869,9 +869,8 @@ int main(int argc, char **argv, char **envp)
qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
- qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
- qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
- info->arg_end + (abi_ulong)sizeof(abi_ulong));
+ qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->argv);
+ qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n", info->envp);
qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
}
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);
--
2.25.1On Tue, 15 Mar 2022 at 22:47, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> 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.
"Retain arg_strings/env_strings with the meaning we were using
in elfload.c" ? (ie linuxload.c changes to that definition).
> Update linuxload.c, elfload.c, and arm-compat-semi.c to match.
>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/714
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> --- a/linux-user/linuxload.c
> +++ b/linux-user/linuxload.c
> @@ -92,33 +92,35 @@ 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 */
Why are you deleting all these FIXME comments? That seems like an
unrelated change.
Otherwise
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM
On 3/18/22 04:41, Peter Maydell wrote: > On Tue, 15 Mar 2022 at 22:47, Richard Henderson > <richard.henderson@linaro.org> wrote: >> >> 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. > > "Retain arg_strings/env_strings with the meaning we were using > in elfload.c" ? (ie linuxload.c changes to that definition). Ah, yes, quite. >> - /* FIXME - handle put_user() failures */ > > Why are you deleting all these FIXME comments? That seems like an > unrelated change. Indeed. Instead of just removing these, I should convert to lock the entire buffer and use __put_user instead. r~
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