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