So i am really, really sorry to be here once again.
(And without really looking)
Natanael Copa wrote in
<20230110131112.4d6022cc@ncopa-desktop>:
|On Sun, 08 Jan 2023 20:22:31 +0100
|Sören Tempel <soe...@soeren-tempel.net> wrote:
|> Investigated this further. The problem is a text relocation created by
|> the hash_md5_sha256_x86-32_shaNI.S file. When compiling BusyBox with
|> LDFLAGS=-Wl,-z,text one is warned about the following relocation by gcc:
...
|But for the $K256 data we'd need use the global offset table. Not sure \
|exactly how to do that.
Twenty years ago i head (this x86 not x86-64, say)
#if SF_PIC
.extern G(_GLOBAL_OFFSET_TABLE_)
# define GET_GOT() \
pushl %ebx;\
call 1f;\
1: popl %ebx;\
addl $G(_GLOBAL_OFFSET_TABLE_)+(.-1b), %ebx
# define UNGET_GOT() \
popl %ebx
# define GOT @GOT(%ebx) // external sym ('s ptr; leal + deref)
# define GOTOFF @GOTOFF(%ebx) // local sym (leal)
# define PLT @PLT // function
# define PIC_INJ(X) X
# define PICSO(OFF) OFF+4 // PIC-STACK-OFFSET
#else // SF_PIC
# define GET_GOT()
# define UNGET_GOT()
# define GOT
# define GOTOFF
# define PLT
# define PIC_INJ(X)
# define PICSO(OFF) OFF
#endif // !SF_PIC
Which then could be used like
.if SF_PIC ;\
leal L(THELOCALSYM)GOTOFF, %eax;\
.else ; \
pushl $L(THELOCALSYM);\
.endif ;\
Function arguments loading from stack via
movl __PICSO(4)(%esp), %edi
I have not done that since about 2006 though. But should work,
no? I was never so smart like the guys that did this IBT thing.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
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