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better hadling of Linux AT_SYSINFO (32 <= a_type)

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committer: jreiser <jreiser> 1048872136 +0000
This commit is contained in:
John Reiser
2003-03-28 17:22:16 +00:00
parent cd15b7d5af
commit 502f9b5a00
1 changed files with 4 additions and 5 deletions
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src/stub/fold_elf86.asm
+4 -5
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@@ -73,7 +73,6 @@ fold_begin: ; enter: %ebx= &Elf32_Ehdr of this program
%define AT_PHNUM 5 %define AT_PHNUM 5
%define AT_PAGESZ 6 %define AT_PAGESZ 6
%define AT_ENTRY 9 %define AT_ENTRY 9
%define AT_NUMBER 20
sub ecx, ecx sub ecx, ecx
mov edx, (1<<AT_PHDR) | (1<<AT_PHENT) | (1<<AT_PHNUM) | (1<<AT_PAGESZ) | (1<<AT_ENTRY) mov edx, (1<<AT_PHDR) | (1<<AT_PHENT) | (1<<AT_PHNUM) | (1<<AT_PAGESZ) | (1<<AT_ENTRY)
@@ -181,14 +180,14 @@ L20: ; move envp
L30: ; process auxv L30: ; process auxv
lodsd ; a_type lodsd ; a_type
stosd stosd
cmp al, 32 cmp eax, byte 32
jae L32 ; prevent aliasing of 'btr' when 32<=a_type jae L32 ; prevent aliasing by 'btr' when 32<=a_type
btr edx, eax ; no longer need a slot of type eax [Carry only] btr edx, eax ; no longer need a slot of type eax [Carry only]
L32: L32:
test eax, eax ; AT_NULL ? [flags: Zero, Sign, Parity; C=0, V=0] test eax, eax ; AT_NULL ?
lodsd lodsd
stosd stosd
jnz L30 ; checks only Zero bit of flags jnz L30 ; a_type != AT_NULL
sub edi, byte 8 ; backup to AT_NULL sub edi, byte 8 ; backup to AT_NULL
add ecx, ecx ; two words per auxv add ecx, ecx ; two words per auxv