2003-10-27 Bernardo Innocenti <bernie@develer.com>
* m68k/asm.h: Add macros for -fPIC, -msep-data and
-mid-shared-library support.
* m68k/crt0.S: Use macros for -fPIC, -msep-data and
-mid-shared-library support.
* m68k/sim-crt0.S: Likewise.
This commit is contained in:
Jeff Johnston
parent
56a4ceac3d
commit
bfe5ae413f
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@ -1,3 +1,11 @@
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2003-10-27 Bernardo Innocenti <bernie@develer.com>
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* m68k/asm.h: Add macros for -fPIC, -msep-data and
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-mid-shared-library support.
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* m68k/crt0.S: Use macros for -fPIC, -msep-data and
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-mid-shared-library support.
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* m68k/sim-crt0.S: Likewise.
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2003-10-15 Bernardo Innocenti <bernie@develer.com>
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* m68k/sim-funcs.c (_XOPEN_SOURCE): Define to get the pid_t
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@ -83,3 +83,72 @@
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#define fpcr REG (fpcr)
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#define fpsr REG (fpsr)
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#define fpi REG (fpi)
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/* Provide a few macros to allow for PIC code support.
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* With PIC, data is stored A5 relative so we've got to take a bit of special
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* care to ensure that all loads of global data is via A5. PIC also requires
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* jumps and subroutine calls to be PC relative rather than absolute. We cheat
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* a little on this and in the PIC case, we use short offset branches and
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* hope that the final object code is within range (which it should be).
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*/
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#ifndef __PIC__
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/* Non PIC (absolute/relocatable) versions */
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.macro PICCALL addr
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jbsr \addr
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.endm
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.macro PICJUMP addr
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jmp \addr
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.endm
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.macro PICLEA sym, reg
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lea \sym, \reg
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.endm
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.macro PICPEA sym, areg
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pea \sym
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.endm
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#else /* __PIC__ */
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/* Common for -mid-shared-libary and -msep-data */
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.macro PICCALL addr
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bsr \addr
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.endm
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.macro PICJUMP addr
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bra \addr
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.endm
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# if defined(__ID_SHARED_LIBRARY__)
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/* -mid-shared-library versions */
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.macro PICLEA sym, reg
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movel a5@(_current_shared_library_a5_offset_), \reg
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movel \sym@GOT(\reg), \reg
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.endm
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.macro PICPEA sym, areg
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movel a5@(_current_shared_library_a5_offset_), \areg
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movel \sym@GOT(\areg), sp@-
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.endm
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# else /* !__ID_SHARED_LIBRARY__ */
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/* Versions for -msep-data */
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.macro PICLEA sym, reg
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movel \sym@GOT(a5), \reg
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.endm
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.macro PICPEA sym, areg
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movel \sym@GOT(a5), sp@-
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.endm
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# endif /* !__ID_SHARED_LIBRARY__ */
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#endif /* __PIC__ */
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@ -84,7 +84,7 @@ SYM (start):
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subql IMM(1), d0
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2:
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clrb (a0)+
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#ifndef __mcf5200__
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#if !defined(__mcoldfire__) && !defined(__mcf5200__)
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dbra d0, 2b
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clrw d0
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subql IMM(1), d0
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@ -100,13 +100,13 @@ SYM (start):
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* initialize target specific stuff. Only execute these
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* functions it they exist.
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*/
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lea SYM (hardware_init_hook), a0
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PICLEA SYM (hardware_init_hook), a0
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cmpl IMM(0),a0
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jbeq 4f
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jsr (a0)
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4:
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lea SYM (software_init_hook), a0
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PICLEA SYM (software_init_hook), a0
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cmpl IMM(0),a0
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jbeq 5f
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jsr (a0)
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@ -121,18 +121,18 @@ SYM (start):
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#ifdef ADD_DTORS
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/* put __do_global_dtors in the atexit list so the destructors get run */
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movel IMM (SYM(__do_global_dtors)),(sp)
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jsr SYM (atexit)
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PICCALL SYM (atexit)
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#endif
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movel IMM (__FINI_SECTION__),(sp)
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jsr SYM (atexit)
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PICCALL SYM (atexit)
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jsr __INIT_SECTION__
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PICCALL __INIT_SECTION__
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pea 0
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pea SYM (environ)
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PICPEA SYM (environ),a0
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pea sp@(4)
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pea 0
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jsr SYM (main)
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PICCALL SYM (main)
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movel d0, sp@-
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/*
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@ -140,4 +140,4 @@ SYM (start):
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* control back to the ROM monitor, if there is one. This calls the
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* exit() from the C library so the C++ tables get cleaned up right.
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*/
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jsr SYM (exit)
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PICCALL SYM (exit)
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@ -78,7 +78,7 @@ SYM (start):
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subql IMM(1), d0
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2:
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clrb (a0)+
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#ifndef __mcf5200__
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#if !defined(__mcoldfire__) && !defined(__mcf5200__)
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dbra d0, 2b
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clrw d0
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subql IMM(1), d0
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@ -99,18 +99,18 @@ SYM (start):
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#ifdef ADD_DTORS
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/* put __do_global_dtors in the atexit list so the destructors get run */
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movel IMM (SYM(__do_global_dtors)),(sp)
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jsr SYM (atexit)
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PICCALL SYM (atexit)
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#endif
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movel IMM (__FINI_SECTION__),(sp)
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jsr SYM (atexit)
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PICCALL SYM (atexit)
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jsr __INIT_SECTION__
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PICCALL __INIT_SECTION__
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pea 0
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pea SYM (environ)
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PICPEA SYM (environ),a0
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pea sp@(4)
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pea 0
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jsr SYM (main)
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PICCALL SYM (main)
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movel d0, sp@-
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/*
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@ -118,4 +118,4 @@ SYM (start):
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* control back to the ROM monitor, if there is one. This calls the
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* exit() from the C library so the C++ tables get cleaned up right.
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*/
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jsr SYM (exit)
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PICCALL SYM (exit)
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