| Line 27... |
Line 27... |
#define STACK_SIZE 0x4000
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#define STACK_SIZE 0x4000
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#define GLOBAL_SIZE 0x2000
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#define GLOBAL_SIZE 0x2000
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#define STARTUP_STACK_SIZE 0x0100
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#define STARTUP_STACK_SIZE 0x0100
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/* This is for referencing addresses that are not in the .sdata or
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.sbss section under embedded-pic, or before we've set up gp. */
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#ifdef __mips_embedded_pic
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# ifdef __mips64
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# define LA(t,x) la t,x-PICBASE ; daddu t,s0,t
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# else
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# define LA(t,x) la t,x-PICBASE ; addu t,s0,t
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# endif
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#else /* __mips_embedded_pic */
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# define LA(t,x) la t,x
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#endif /* __mips_embedded_pic */
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.comm __memsize, 12
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.comm __memsize, 12
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.comm __lstack, STARTUP_STACK_SIZE
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.comm __lstack, STARTUP_STACK_SIZE
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.comm __stackbase,4
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.comm __stackbase,4
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.text
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.text
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| Line 44... |
Line 56... |
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.globl _start
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.globl _start
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.ent _start
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.ent _start
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_start:
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_start:
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.set noreorder
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.set noreorder
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#ifdef __mips_embedded_pic
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PICBASE = .+8
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bal PICBASE
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nop
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move s0,$31
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#endif
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li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX
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li v0, SR_CU1|SR_PE|SR_FR|SR_KX|SR_SX|SR_UX
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mtc0 v0, C0_SR
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mtc0 v0, C0_SR
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mtc0 zero, C0_CAUSE
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mtc0 zero, C0_CAUSE
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|
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/* Check for FPU presence */
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/* Check for FPU presence */
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| Line 62... |
Line 81... |
nop
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nop
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bne t0,t2,1f /* check for match */
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bne t0,t2,1f /* check for match */
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nop
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nop
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bne t1,zero,1f /* double check */
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bne t1,zero,1f /* double check */
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nop
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nop
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j 2f /* status register already correct */
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#ifndef __mips64 /* Clear the FR bit */
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li v0, SR_CU1|SR_PE|SR_KX|SR_SX|SR_UX
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mtc0 v0, C0_SR
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#endif
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j 2f
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nop
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nop
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#endif
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#endif
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1:
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1:
|
li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX
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li v0, SR_PE|SR_FR|SR_KX|SR_SX|SR_UX
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mtc0 v0, C0_SR
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mtc0 v0, C0_SR
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2:
|
2:
|
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/* Fix high bits, if any, of the PC so that exception handling
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doesn't get confused. */
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LA (v0, 3f)
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jr v0
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nop
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3:
|
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LA (gp, _gp) # set the global data pointer
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.end _start
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.end _start
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|
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/*
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/*
|
* zero out the bss section.
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* zero out the bss section.
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*/
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*/
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| Line 81... |
Line 111... |
.globl __stack
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.globl __stack
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.globl __global
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.globl __global
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.globl zerobss
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.globl zerobss
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.ent zerobss
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.ent zerobss
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zerobss:
|
zerobss:
|
la v0, _fbss
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LA (v0, _fbss)
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la v1, _end
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LA (v1, _end)
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3:
|
3:
|
sw zero,0(v0)
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sw zero,0(v0)
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bltu v0,v1,3b
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bltu v0,v1,3b
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addiu v0,v0,4 # executed in delay slot
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addiu v0,v0,4 # executed in delay slot
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| Line 95... |
Line 125... |
la a0, __memsize # get the usable memory size
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la a0, __memsize # get the usable memory size
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jal get_mem_info
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jal get_mem_info
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nop
|
nop
|
|
|
/* setup the stack pointer */
|
/* setup the stack pointer */
|
la t0,__stack # is __stack set ?
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LA (t0, __stack) # is __stack set ?
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bne t0,zero,4f
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bne t0,zero,4f
|
nop
|
nop
|
|
|
/* NOTE: a0[0] contains the amount of memory available, and
|
/* NOTE: a0[0] contains the amount of memory available, and
|
not the last memory address. */
|
not the last memory address. */
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| Line 116... |
Line 146... |
32, which satisifes the stack for the arguments and keeps the
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32, which satisifes the stack for the arguments and keeps the
|
stack pointer better aligned. */
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stack pointer better aligned. */
|
subu t0,t0,32 # and generate a starting stack-pointer
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subu t0,t0,32 # and generate a starting stack-pointer
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4:
|
4:
|
move sp,t0 # set stack pointer
|
move sp,t0 # set stack pointer
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la gp,_gp # set the global data pointer
|
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sw sp,__stackbase # keep this for future ref
|
sw sp,__stackbase # keep this for future ref
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.end zerobss
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.end zerobss
|
|
|
/*
|
/*
|
* initialize target specific stuff. Only execute these
|
* initialize target specific stuff. Only execute these
|
| Line 132... |
Line 161... |
.globl atexit .text
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.globl atexit .text
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.globl exit .text
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.globl exit .text
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.globl init
|
.globl init
|
.ent init
|
.ent init
|
init:
|
init:
|
la t9,hardware_init_hook # init the hardware if needed
|
LA (t9, hardware_init_hook) # init the hardware if needed
|
beq t9,zero,6f
|
beq t9,zero,6f
|
nop
|
nop
|
jal t9
|
jal t9
|
nop
|
nop
|
6:
|
6:
|
la t9,software_init_hook # init the software if needed
|
LA (t9, software_init_hook) # init the hardware if needed
|
beq t9,zero,7f
|
beq t9,zero,7f
|
nop
|
nop
|
jal t9
|
jal t9
|
nop
|
nop
|
7:
|
7:
|
la a0,__do_global_dtors
|
LA (a0, __do_global_dtors)
|
jal atexit
|
jal atexit
|
nop
|
nop
|
|
|
#ifdef GCRT0
|
#ifdef GCRT0
|
.globl _ftext
|
.globl _ftext
|
.globl _extext
|
.globl _extext
|
la a0,_ftext
|
LA (a0, _ftext)
|
la a1,_etext
|
LA (a1, _etext)
|
jal monstartup
|
jal monstartup
|
nop
|
nop
|
#endif
|
#endif
|
|
|
|
move a0,zero # set argc to 0
|
jal main # call the program start function
|
jal main # call the program start function
|
nop
|
nop
|
|
|
# fall through to the "exit" routine
|
# fall through to the "exit" routine
|
jal exit # call libc exit to run the G++
|
jal exit # call libc exit to run the G++
|
