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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2022-05-25 08:58:38 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2022-05-30 16:32:35 -0300
commit6242602273feb8d68cd51cff0ad21b3c8ee11fc6 (patch)
tree95c7cfb845ae2dd5d3bc04eba885b276d260cd01 /sysdeps/hppa
parent00477963c6a5abd3075044f180d4d0d122a77de0 (diff)
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hppa: Remove _dl_skip_args usage (BZ# 29165)
Different than other architectures, hppa creates an unrelated stack frame where ld.so argc/argv adjustments done by ad43cac44a6860eaefc is not done on the argc/argv saved/restore by _dl_start_user. Instead load _dl_argc and _dl_argv directlty instead of adjust them using _dl_skip_args value. Checked on hppa-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'sysdeps/hppa')
-rw-r--r--sysdeps/hppa/dl-machine.h36
1 files changed, 14 insertions, 22 deletions
diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h
index 8c0ca32..c865713 100644
--- a/sysdeps/hppa/dl-machine.h
+++ b/sysdeps/hppa/dl-machine.h
@@ -354,10 +354,6 @@ asm ( \
"_start:\n" \
/* The kernel does not give us an initial stack frame. */ \
" ldo 64(%sp),%sp\n" \
- /* Save the relevant arguments (yes, those are the correct \
- registers, the kernel is weird) in their stack slots. */ \
-" stw %r25,-40(%sp)\n" /* argc */ \
-" stw %r24,-44(%sp)\n" /* argv */ \
\
/* We need the LTP, and we need it now. \
$PIC_pcrel$0 points 8 bytes past the current instruction, \
@@ -415,12 +411,7 @@ asm ( \
So, obviously, we can't just pass %sp to _dl_start. That's \
okay, argv-4 will do just fine. \
\
- The pleasant part of this is that if we need to skip \
- arguments we can just decrement argc and move argv, because \
- the stack pointer is utterly unrelated to the location of \
- the environment and argument vectors. */ \
- \
- /* This is always within range so we'll be okay. */ \
+ This is always within range so we'll be okay. */ \
" bl _dl_start,%rp\n" \
" ldo -4(%r24),%r26\n" \
\
@@ -430,22 +421,23 @@ asm ( \
/* Save the entry point in %r3. */ \
" copy %ret0,%r3\n" \
\
- /* See if we were called as a command with the executable file \
- name as an extra leading argument. */ \
-" addil LT'_dl_skip_args,%r19\n" \
-" ldw RT'_dl_skip_args(%r1),%r20\n" \
-" ldw 0(%r20),%r20\n" \
- \
-" ldw -40(%sp),%r25\n" /* argc */ \
-" comib,= 0,%r20,.Lnofix\n" /* FIXME: Mispredicted branch */\
-" ldw -44(%sp),%r24\n" /* argv (delay slot) */ \
+ /* The loader adjusts argc, argv, env, and the aux vectors \
+ directly on the stack to remove any arguments used for \
+ direct loader invocation. Thus, argc and argv must be \
+ reloaded from from _dl_argc and _dl_argv. */ \
\
-" sub %r25,%r20,%r25\n" \
+ /* Load argc from _dl_argc. */ \
+" addil LT'_dl_argc,%r19\n" \
+" ldw RT'_dl_argc(%r1),%r20\n" \
+" ldw 0(%r20),%r25\n" \
" stw %r25,-40(%sp)\n" \
-" sh2add %r20,%r24,%r24\n" \
+ \
+ /* Same for argv with _dl_argv. */ \
+" addil LT'_dl_argv,%r19\n" \
+" ldw RT'_dl_argv(%r1),%r20\n" \
+" ldw 0(%r20),%r24\n" \
" stw %r24,-44(%sp)\n" \
\
-".Lnofix:\n" \
/* Call _dl_init(main_map, argc, argv, envp). */ \
" addil LT'_rtld_local,%r19\n" \
" ldw RT'_rtld_local(%r1),%r26\n" \