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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. */
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#ifndef ELF_IFUNC_SEL_H
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#define ELF_IFUNC_SEL_H 1
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extern int global;
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static inline void *
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inhibit_stack_protector
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ifunc_sel (int (*f1) (void), int (*f2) (void), int (*f3) (void))
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{
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register void *ret __asm__ ("r3");
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__asm__ ("mflr 12\n\t"
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"bcl 20,31,1f\n"
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"1:\tmflr 11\n\t"
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"mtlr 12\n\t"
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"addis 12,11,global-1b@ha\n\t"
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"lwz 12,global-1b@l(12)\n\t"
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"addis %0,11,%2-1b@ha\n\t"
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"addi %0,%0,%2-1b@l\n\t"
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"cmpwi 12,1\n\t"
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"beq 2f\n\t"
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"addis %0,11,%3-1b@ha\n\t"
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"addi %0,%0,%3-1b@l\n\t"
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"cmpwi 12,-1\n\t"
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"beq 2f\n\t"
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"addis %0,11,%4-1b@ha\n\t"
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"addi %0,%0,%4-1b@l\n\t"
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"2:"
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: "=r" (ret)
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: "i" (&global), "i" (f1), "i" (f2), "i" (f3)
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: "11", "12", "cr0");
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return ret;
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}
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static inline void *
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inhibit_stack_protector
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ifunc_one (int (*f1) (void))
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{
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register void *ret __asm__ ("r3");
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__asm__ ("mflr 12\n\t"
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"bcl 20,31,1f\n"
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"1:\tmflr %0\n\t"
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"mtlr 12\n\t"
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"addis %0,%0,%1-1b@ha\n\t"
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"addi %0,%0,%1-1b@l"
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: "=r" (ret)
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: "i" (f1)
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: "12");
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return ret;
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}
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#endif
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