mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
de6591238b
When dynamically linking, ifunc resolvers are called before TLS is
initialized, so they cannot be safely stack-protected.
We avoid disabling stack-protection on large numbers of files by
using __attribute__ ((__optimize__ ("-fno-stack-protector")))
to turn it off just for the resolvers themselves. (We provide
the attribute even when statically linking, because we will later
use it elsewhere too.)
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/* Used by the elf ifunc tests. */
|
|
#ifndef ELF_IFUNC_SEL_H
|
|
#define ELF_IFUNC_SEL_H 1
|
|
|
|
extern int global;
|
|
|
|
static inline void *
|
|
inhibit_stack_protector
|
|
ifunc_sel (int (*f1) (void), int (*f2) (void), int (*f3) (void))
|
|
{
|
|
register void *ret __asm__ ("r3");
|
|
__asm__ ("mflr 12\n\t"
|
|
"bcl 20,31,1f\n"
|
|
"1:\tmflr 11\n\t"
|
|
"mtlr 12\n\t"
|
|
"addis 12,11,global-1b@ha\n\t"
|
|
"lwz 12,global-1b@l(12)\n\t"
|
|
"addis %0,11,%2-1b@ha\n\t"
|
|
"addi %0,%0,%2-1b@l\n\t"
|
|
"cmpwi 12,1\n\t"
|
|
"beq 2f\n\t"
|
|
"addis %0,11,%3-1b@ha\n\t"
|
|
"addi %0,%0,%3-1b@l\n\t"
|
|
"cmpwi 12,-1\n\t"
|
|
"beq 2f\n\t"
|
|
"addis %0,11,%4-1b@ha\n\t"
|
|
"addi %0,%0,%4-1b@l\n\t"
|
|
"2:"
|
|
: "=r" (ret)
|
|
: "i" (&global), "i" (f1), "i" (f2), "i" (f3)
|
|
: "11", "12", "cr0");
|
|
return ret;
|
|
}
|
|
|
|
static inline void *
|
|
inhibit_stack_protector
|
|
ifunc_one (int (*f1) (void))
|
|
{
|
|
register void *ret __asm__ ("r3");
|
|
__asm__ ("mflr 12\n\t"
|
|
"bcl 20,31,1f\n"
|
|
"1:\tmflr %0\n\t"
|
|
"mtlr 12\n\t"
|
|
"addis %0,%0,%1-1b@ha\n\t"
|
|
"addi %0,%0,%1-1b@l"
|
|
: "=r" (ret)
|
|
: "i" (f1)
|
|
: "12");
|
|
return ret;
|
|
}
|
|
#endif
|