diff options
Diffstat (limited to 'libc/sysdeps/linux/m68k/m68k_pic.S')
| -rw-r--r-- | libc/sysdeps/linux/m68k/m68k_pic.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/m68k/m68k_pic.S b/libc/sysdeps/linux/m68k/m68k_pic.S new file mode 100644 index 000000000..e01e33b83 --- /dev/null +++ b/libc/sysdeps/linux/m68k/m68k_pic.S @@ -0,0 +1,64 @@ +/* + * Copyright (C) 2006 CodeSourcery Inc + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + * + * This file defines some m68k assembly macros for handling the differences + * between PIC and non-PIC. + */ +#include <features.h> + + /* When assembling code for shared flat libraries, this is nonzero + * if %a5 points the current library's GOT. */ + .equ have_current_got, 0 + + /* Perform the equivalent of "<op> <target>", where <target> is + * a text address. <tmp> is available as a temporary address + * register. */ + .macro DO_TEXT op,target,tmp +#if defined __HAVE_SHARED_FLAT__ + .ifne have_current_got + move.l \target@GOT(%a5),\tmp + .else + move.l _current_shared_library_a5_offset_(%a5),\tmp + move.l \target@GOT(\tmp),\tmp + .endif + \op (\tmp) +#elif defined __PIC__ + lea \target-.-8,\tmp + \op (%pc,\tmp) +#else + \op \target +#endif + .endm + + /* Do "pea <target>" when <target> is a text address. + * <tmp> is available as a temporary register. */ + .macro PEA_TEXT target,tmp + DO_TEXT pea,\target,\tmp + .endm + + /* Likewise jsr. */ + .macro CALL target,tmp + DO_TEXT jsr,\target,\tmp + .endm + + /* Likewise jmp. */ + .macro JUMP target,tmp + DO_TEXT jmp,\target,\tmp + .endm + + /* Initialize the global pointer, if functions need to do that. */ + .macro INIT_GP +#if defined __HAVE_SHARED_FLAT__ + move.l %a5,-(%sp) + move.l _current_shared_library_a5_offset_(%a5),%a5 +#endif + .endm + + /* Undo the effects of INIT_GP. */ + .macro FINI_GP +#if defined __HAVE_SHARED_FLAT__ + move.l (%sp)+,%a5 +#endif + .endm |