glibc/sysdeps/aarch64/Makefile at 389d1f1b232b3d6b9d73ee2c50e543ace6675621 - picnoir/glibc - Alternativebit

picnoir/glibc

Szabolcs Nagy efbe665c3a [AArch64] Fix libc internal asm profiling code

When glibc is built with --enable-profile, the ENTRY of
asm functions includes CALL_MCOUNT for profiling.
(matters for binaries static linked against libc_p.a.)

CALL_MCOUNT did not save/restore argument registers
around the _mcount call so it clobbered them.
(it is enough to only save/restore the arguments passed
to a given asm function, but that would be too many asm
changes so it is simpler to always save all argument
registers in this macro.)

float args are not saved: mcount does not clobber the
float regs and currently no asm function takes float
arguments anyway.

	[BZ #18707]
	* sysdeps/aarch64/Makefile (CFLAGS-mcount.c): Add -mgeneral-regs-only.
	* sysdeps/aarch64/sysdep.h (CALL_MCOUNT): Save argument registers.

2016-07-11 09:50:41 +01:00

19 lines

328 B

Makefile

Raw Blame History

 long-double-fcts = yes
 ifeq ($(subdir),debug)
 CFLAGS-backtrace.c += -funwind-tables
 endif
 ifeq ($(subdir),elf)
 sysdep-dl-routines += tlsdesc dl-tlsdesc
 gen-as-const-headers += dl-link.sym
 endif
 ifeq ($(subdir),csu)
 gen-as-const-headers += tlsdesc.sym
 endif
 ifeq ($(subdir),gmon)
 CFLAGS-mcount.c += -mgeneral-regs-only
 endif