diff options
Diffstat (limited to 'libgloss/sparc/erc32-crt0.S')
| -rw-r--r-- | libgloss/sparc/erc32-crt0.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libgloss/sparc/erc32-crt0.S b/libgloss/sparc/erc32-crt0.S new file mode 100644 index 000000000..8f8b1ea9c --- /dev/null +++ b/libgloss/sparc/erc32-crt0.S @@ -0,0 +1,75 @@ +/* + * This is based on the file srt0.s provided with the binary + * distribution of the SPARC Instruction Simulator (SIS) found + * at ftp://ftp.estec.esa.nl/pub/ws/wsd/erc32. + */ + +#include "asm.h" + + .data + .align 8 +SYM(environ): + .long 0 + + .text + + .globl SYM(start) +SYM(start): + sethi %hi(__stack), %g1 + or %g1,%lo(__stack),%g1 + mov %g1, %sp ! set the stack pointer + mov %sp, %fp + + /* clear the bss */ + sethi %hi(__bss_start),%g2 + or %g2,%lo(__bss_start),%g2 ! start of bss + sethi %hi(_end),%g3 + or %g3,%lo(_end),%g3 ! end of bss + mov %g0,%g1 ! so std has two zeros +zerobss: + std %g0,[%g2] + add %g2,8,%g2 + cmp %g2,%g3 + bleu,a zerobss + nop + + /* move data segment to proper location */ + +#if 0 +relocd: + set (_endtext),%g2 ! g2 = start of data in aout file + set (_environ),%g4 ! g4 = start of where data should go + set (_edata),%g3 ! g3 = end of where data should go + subcc %g3, %g4, %g5 ! g5 = length of data + + subcc %g4, %g2, %g0 ! need to relocate data ? + ble initok + ld [%g4], %g6 + subcc %g6, 1, %g0 + be initok +mvdata: + subcc %g5, 8, %g5 + ldd [%g2 + %g5], %g6 + bg mvdata + std %g6, [%g4 + %g5] + +initok: +#endif + + call SYM(__fix_ctors) + nop + call SYM(main) + nop + + /* call exit from the C library so atexit gets called, and the + * C++ destructors get run. This calls our exit routine below * when it's done. + */ + call SYM(exit) + nop + + .globl SYM(_exit) +SYM(_exit): + set 0xdeadd00d, %o1 ! Magic number for simulator. + ta 0 ! Halt if _main returns ... + nop + |