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In PIC code call setcontext(2) via PLT to avoid text reloc in the 

shared library.
This commit is contained in:
uwe 2006-01-04 17:44:53 +00:00
parent b2bb747d7c
commit 55ad9313a6
1 changed files with 23 additions and 15 deletions
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38
lib/libpthread/arch/sh3/_context_u.S
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@ -1,4 +1,4 @@
/* $NetBSD: _context_u.S,v 1.4 2003/11/17 22:38:11 uwe Exp $ */
/* $NetBSD: _context_u.S,v 1.5 2006/01/04 17:44:53 uwe Exp $ */
/*
* Copyright (c) 2003 Christian P. Groessler
@ -114,36 +114,44 @@
/* NOTREACHED */
#ifdef PIC
/*
* For PIC code we need a per-call offset to the setcontext.
* Fortunately, since setcontext(2) does not return, we can
* put the offset right after the call.
* put the offset right after the call. We also don't need to
* save/restore r12.
*/
#define CALL_SETCONTEXT(uc) \
mov.l 2f, r1 ; \
mov.l 2f, r12 ; \
mov.l 3f, r1 ; \
mova 2f, r0 ; \
.ifnc "uc","r4" ; \
mov uc, r4 ; \
.endif ; \
1: bsrf r1 ; \
MAYBE_MOV_UC_R4(uc) ; \
add r0, r12 ; \
NOTREACHED ; \
.align 2 ; \
2: .long _C_LABEL(setcontext)-(1b+4)
2: .long _GLOBAL_OFFSET_TABLE_ ; \
3: CALL_DATUM(_C_LABEL(setcontext), 1b)
#else /* !PIC */
/*
* For static code all calls to setcontext can share single locations
* For static code all calls to setcontext can share single location
* with the address of setcontext (see below).
*/
#define CALL_SETCONTEXT(uc) \
mov.l .L_setcontext, r1 ; \
jsr @r1 ; \
MAYBE_MOV_UC_R4(uc) ; \
NOTREACHED
#endif
#define MAYBE_MOV_UC_R4(uc) \
.ifc "uc","r4" ; \
nop ; \
.else ; \
.ifnc "uc","r4" ; \
mov uc, r4 ; \
.endif
.else ; \
nop ; \
.endif ; \
NOTREACHED
#endif