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(EPILOGUE, GPSAVEREG): New.

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(LOADGP) [!PIC]: Rewrite to preserve caller's gp.
This commit is contained in:
Ulrich Drepper 2003-01-17 19:19:55 +00:00
parent 2c7ba672ef
commit af215add0a
1 changed files with 36 additions and 6 deletions
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42
sysdeps/unix/alpha/sysdep.S
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@ -1,4 +1,4 @@
/* Copyright (C) 1993, 1996, 1998, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1993, 1996, 1998, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Brendan Kehoe (brendan@zen.org).
@ -35,9 +35,26 @@
have we loaded PV with our address. Do both. */
# define LOADGP br pv, 1f; 1: ldgp gp, 0(pv)
# define PROLOGUE .prologue 0
# define EPILOGUE
#else
# define LOADGP ldgp gp, 0(pv)
/* When building the static library, we tail call here from
elsewhere, which might use a different GP. The entertaining
part is that we have to return with the GP of our caller
in place, so that linker relaxation works properly. */
/* ??? This is so ugly. Consider always putting the errno
setting code with the syscall in the static case. */
# define GPSAVEREG t10
# define LOADGP ldah t11, 0(pv) !gpdisp!1; \
br 1f; \
.subsection 2; \
1: mov gp, GPSAVEREG; \
lda gp, 0(t11) !gpdisp!1; \
br 2f; \
.previous; \
mov gp, GPSAVEREG; \
2:
# define PROLOGUE .prologue 1
# define EPILOGUE mov GPSAVEREG, gp
#endif
.align 4
@ -61,16 +78,20 @@ __syscall_error:
addq v0, t1, v0
stl t0, 0(v0)
lda v0, -1
EPILOGUE
ret
#elif defined(_LIBC_REENTRANT)
LOADGP
lda sp, -16(sp)
.frame sp, 16, ra, 0
lda sp, -32(sp)
.frame sp, 32, ra, 0
stq ra, 0(sp)
stq v0, 8(sp)
.mask 0x4000001, -16
#ifdef GPSAVEREG
stq GPSAVEREG, 16(sp)
#endif
.mask 0x4000001, -32
PROLOGUE
/* Find our per-thread errno address */
@ -78,6 +99,9 @@ __syscall_error:
bsr ra, __errno_location !samegp
#else
jsr ra, __errno_location
#ifndef GPSAVEREG
ldgp gp, 0(ra)
#endif
#endif
/* Store the error value. */
@ -87,8 +111,12 @@ __syscall_error:
/* And kick back a -1. */
ldi v0, -1
#ifdef GPSAVEREG
ldq GPSAVEREG, 16(sp)
#endif
ldq ra, 0(sp)
lda sp, 16(sp)
lda sp, 32(sp)
EPILOGUE
ret
#else
@ -97,8 +125,10 @@ __syscall_error:
PROLOGUE
stl v0, errno
lda v0, -1
EPILOGUE
ret
#endif
.subsection 3
.end __syscall_error