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Fix sparc libm when all of glibc is built with -frounding-math.

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[BZ #14074]
	* sysdeps/sparc/sysdep.h (SPARC_PIC_THUNK_CALL): New macro.
	(SETUP_PIC_REG): Use it.
	(SETUP_PIC_REG_LEAF): Use it.
This commit is contained in:
David S. Miller 2012-05-07 16:54:11 -07:00
parent 20f244a03f
commit 7f18b530e9
2 changed files with 26 additions and 6 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-05-07 David S. Miller <davem@davemloft.net>
[BZ #14074]
* sysdeps/sparc/sysdep.h (SPARC_PIC_THUNK_CALL): New macro.
(SETUP_PIC_REG): Use it.
(SETUP_PIC_REG_LEAF): Use it.
2012-05-07 Joseph Myers <joseph@codesourcery.com>
[BZ #13885]

25
sysdeps/sparc/sysdep.h
View File

@ -58,21 +58,34 @@ __sparc_get_pc_thunk.reg: \
.previous; \
.endif;
/* Even when v9 we use a call sequence instead of using "rd %pc" because
/* The "-4" and "+4" offsets against _GLOBAL_OFFSET_TABLE_ are
critical since they represent the offset from the thunk call to the
instruction containing the _GLOBAL_OFFSET_TABLE_ reference.
Therefore these instructions cannot be moved around without
appropriate adjustments to those offsets.
Furthermore, these expressions are special in another regard. When
the assembler sees a reference to _GLOBAL_OFFSET_TABLE_ inside of
a %hi() or %lo(), it emits a PC-relative relocation. This causes
R_SPARC_HI22 to turn into R_SPARC_PC22, and R_SPARC_LO10 to turn into
R_SPARC_PC10, respectively.
Even when v9 we use a call sequence instead of using "rd %pc" because
RDPC is extremely expensive and incurs a full pipeline flush. */
#define SETUP_PIC_REG(reg) \
SPARC_PIC_THUNK(reg) \
#define SPARC_PIC_THUNK_CALL(reg) \
sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
call __sparc_get_pc_thunk.reg; \
or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg;
#define SETUP_PIC_REG(reg) \
SPARC_PIC_THUNK(reg) \
SPARC_PIC_THUNK_CALL(reg)
#define SETUP_PIC_REG_LEAF(reg, tmp) \
SPARC_PIC_THUNK(reg) \
sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
mov %o7, %##tmp; \
call __sparc_get_pc_thunk.reg; \
or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg; \
SPARC_PIC_THUNK_CALL(reg); \
mov %##tmp, %o7;
#undef ENTRY