diff options
Diffstat (limited to 'libgloss/m68k/asm.h')
| -rw-r--r-- | libgloss/m68k/asm.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libgloss/m68k/asm.h b/libgloss/m68k/asm.h index 035024a3f..e3413858a 100644 --- a/libgloss/m68k/asm.h +++ b/libgloss/m68k/asm.h @@ -83,3 +83,72 @@ #define fpcr REG (fpcr) #define fpsr REG (fpsr) #define fpi REG (fpi) + +/* Provide a few macros to allow for PIC code support. + * With PIC, data is stored A5 relative so we've got to take a bit of special + * care to ensure that all loads of global data is via A5. PIC also requires + * jumps and subroutine calls to be PC relative rather than absolute. We cheat + * a little on this and in the PIC case, we use short offset branches and + * hope that the final object code is within range (which it should be). + */ +#ifndef __PIC__ + + /* Non PIC (absolute/relocatable) versions */ + + .macro PICCALL addr + jbsr \addr + .endm + + .macro PICJUMP addr + jmp \addr + .endm + + .macro PICLEA sym, reg + lea \sym, \reg + .endm + + .macro PICPEA sym, areg + pea \sym + .endm + +#else /* __PIC__ */ + + /* Common for -mid-shared-libary and -msep-data */ + + .macro PICCALL addr + bsr \addr + .endm + + .macro PICJUMP addr + bra \addr + .endm + +# if defined(__ID_SHARED_LIBRARY__) + + /* -mid-shared-library versions */ + + .macro PICLEA sym, reg + movel a5@(_current_shared_library_a5_offset_), \reg + movel \sym@GOT(\reg), \reg + .endm + + .macro PICPEA sym, areg + movel a5@(_current_shared_library_a5_offset_), \areg + movel \sym@GOT(\areg), sp@- + .endm + +# else /* !__ID_SHARED_LIBRARY__ */ + + /* Versions for -msep-data */ + + .macro PICLEA sym, reg + movel \sym@GOT(a5), \reg + .endm + + .macro PICPEA sym, areg + movel \sym@GOT(a5), sp@- + .endm + +# endif /* !__ID_SHARED_LIBRARY__ */ +#endif /* __PIC__ */ + |