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Switch to MD_DO_NOT_NEED_FALLTHRU. 

While here: Factor out .section/.previous wrapper into a separate macro.
Provide frame pointer.  Add the comment to MD_CALL_STATIC_FUNCTION to
explain why it needs semicolon and why we actually don't use that macro.
This commit is contained in:
uwe 2006-10-17 01:10:26 +00:00
parent 8668483161
commit e7b566fa33
1 changed files with 48 additions and 44 deletions
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92
lib/csu/sh3_elf/dot_init.h
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@ -1,4 +1,4 @@
/* $NetBSD: dot_init.h,v 1.3 2005/12/24 22:02:10 perry Exp $ */
/* $NetBSD: dot_init.h,v 1.4 2006/10/17 01:10:26 uwe Exp $ */
/*-
* Copyright (c) 2001 Ross Harvey
@ -35,55 +35,59 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
/*
* These must be extern to avoid warnings ("declared static but never defined")
* However, only the declaration is extern, the actually __asm() defines them
* as static.
* Don't use C versions of _init/_fini, they have become just a
* rudimentary indirection to the entry points we would supply with
* MD_SECTION_PROLOGUE.
*/
#define INIT_FALLTHRU_DECL void init_fallthru(void)
#define FINI_FALLTHRU_DECL void fini_fallthru(void)
#define MD_DO_NOT_NEED_FALLTHRU
#define INIT_FALLTHRU() init_fallthru()
#define FINI_FALLTHRU() fini_fallthru()
#define MD_SECTION_PROLOGUE(sect, entry_pt) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
#entry_pt": \n" \
" sts.l pr, @-r15 \n" \
" .align 2 \n" \
" /* fall thru */ \n" \
".previous")
#define MD_SECTION_EPILOGUE(sect) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
" lds.l @r15+, pr \n" \
" rts \n" \
" nop \n" \
".previous")
#ifdef __LEADING_UNDERSCORE
#define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, _init_fallthru)
#define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, _fini_fallthru)
#else
#define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, init_fallthru)
#define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, fini_fallthru)
#endif
#define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, _init)
#define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, _fini)
#define MD_INIT_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.init)
#define MD_FINI_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.fini)
#define MD_ASM_IN_SECTION(section, content) \
__asm( \
".section " #section ",\"ax\",@progbits\n" \
content "\n" \
".previous")
/*
* We need to put the function pointer in our own constant
* pool (otherwise it might be too far away to reference).
* Declare the entry point global because of MD_DO_NOT_NEED_FALLTHRU.
*/
#define MD_CALL_STATIC_FUNCTION(section, func) \
__asm(".section " #section "\n" \
" mov.l 1f, r1 \n" \
" mova 2f, r0 \n" \
" braf r1 \n" \
" lds r0, pr \n" \
"0: .p2align 2 \n" \
"1: .long " #func " - 0b \n" \
"2: .previous");
#define MD_SECTION_PROLOGUE(section, entry_pt) \
MD_ASM_IN_SECTION(section, \
" .global "_C_LABEL_STRING(#entry_pt)" \n" \
" .type "_C_LABEL_STRING(#entry_pt)",@function\n" \
_C_LABEL_STRING(#entry_pt)": \n" \
" mov.l r14, @-sp \n" \
" sts.l pr, @-sp \n" \
" mov sp, r14 \n" \
" .p2align 2")
/*
* NOTE 1: Supply the semicolon here because crtbegin.c doesn't.
* NOTE 2: We don't use our crtbegin.c for gcc3 and later,
* we use gcc crtstuff.c via src/gnu/lib/crtstuff*
*/
#define MD_CALL_STATIC_FUNCTION(section, func) \
MD_ASM_IN_SECTION(section, \
" mov.l 1f, r1 \n" \
" mova 2f, r0 \n" \
"0: braf r1 \n" \
" lds r0, pr \n" \
\
" .p2align 2 \n" \
"1: .long "_C_LABEL_STRING(#func)" - (0b+4) \n" \
"2: ");
#define MD_SECTION_EPILOGUE(section) \
MD_ASM_IN_SECTION(section, \
" mov r14, sp \n" \
" lds.l @sp+, pr \n" \
" rts \n" \
" mov.l @sp+, r14")