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Decrease relative branch brittleness.

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Replace conditional branches with trampolines to unconditional branches when
jumping to labels within other compilation units.  This increases the offset
range from +-1 MiB to +-128 MiB.
This commit is contained in:
Jason Evans 2017-06-20 07:25:38 +00:00
parent 84c8bb4fbc
commit e46bcb7d38
1 changed files with 6 additions and 2 deletions
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8
lib/libc/aarch64/gen/sigsetjmp.S
View file

@ -34,8 +34,10 @@ __FBSDID("$FreeBSD$");
ENTRY(sigsetjmp)
cmp x1, #0
b.eq _C_LABEL(_setjmp)
b.eq 1f
b _C_LABEL(setjmp)
1:
b _C_LABEL(_setjmp)
END(sigsetjmp)
ENTRY(siglongjmp)
@ -45,8 +47,10 @@ ENTRY(siglongjmp)
/* Check the magic */
cmp x2, x3
b.eq _C_LABEL(_longjmp)
b.eq 1f
b _C_LABEL(longjmp)
1:
b _C_LABEL(_longjmp)
.align 3
.Lmagic:
.quad _JB_MAGIC__SETJMP