crt1.asm

linux下编程用 编译软件

	.byte	0x1
	.byte	0x13
	.byte	0x3f
	.byte	0xc
	.byte	0x3
	.byte	0x8
	.byte	0x3a
	.byte	0xb
	.byte	0x3b
	.byte	0xb
	.byte	0x27
	.byte	0xc
	.byte	0x11
	.byte	0x1
	.byte	0x12
	.byte	0x1
	.byte	0x40
	.byte	0xa
	.byte	0,0
	.byte	0x3
	.byte	0x5
	.byte	0x0
	.byte	0x3
	.byte	0x8
	.byte	0x3a
	.byte	0xb
	.byte	0x3b
	.byte	0xb
	.byte	0x49
	.byte	0x13
	.byte	0x2
	.byte	0xa
	.byte	0,0
	.byte	0x4
	.byte	0x24
	.byte	0x0
	.byte	0x3
	.byte	0x8
	.byte	0xb
	.byte	0xb
	.byte	0x3e
	.byte	0xb
	.byte	0,0
	.byte	0

	.section	.debug_pubnames
	.ualong	0x27
	.uaword	0x2
	.ualong	.Ldebug_info0
	.ualong	0xab
	.ualong	0x5b
	.string	"_superh_trap_handler"

	.ualong	0x0

	.section	.debug_aranges
	.ualong	0x1c
	.uaword	0x2
	.ualong	.Ldebug_info0
	.byte	0x4
	.byte	0x0
	.uaword	0x0,0
	.ualong	.Ltext0
	.ualong	.Letext0-.Ltext0
	.ualong	0x0
	.ualong	0x0
	.ident	"GCC: (GNU) 2.97-sh5-010522"
#endif /* MMU_SUPPORT */
#else /* ! __SH5__ */

	! make a place to keep any previous value of the vbr register
	! this will only have a value if it has been set by redboot (for example)
	.section .bss
old_vbr:
	.long 0

	.section .text
	.global	start
	.import ___rtos_profiler_start_timer
	.weak   ___rtos_profiler_start_timer
start:
	mov.l	stack_k,r15

#if defined (__SH3__) || (defined (__SH_FPU_ANY__) && ! defined (__SH2A__)) || defined (__SH4_NOFPU__)
#define VBR_SETUP
	! before zeroing the bss ...
	! if the vbr is already set to vbr_start then the program has been restarted
	! (i.e. it is not the first time the program has been run since reset)
	! reset the vbr to its old value before old_vbr (in bss) is wiped
	! this ensures that the later code does not create a circular vbr chain
	stc	vbr, r1
	mov.l	vbr_start_k, r2
	cmp/eq	r1, r2
	bf	0f
	! reset the old vbr value
	mov.l	old_vbr_k, r1
	mov.l	@r1, r2
	ldc	r2, vbr
0:	
#endif /* VBR_SETUP */
	
	! zero out bss
	mov.l	edata_k,r0
	mov.l	end_k,r1
	mov	#0,r2
start_l:
	mov.l	r2,@r0
	add	#4,r0
	cmp/ge	r0,r1
	bt	start_l

#if defined (__SH_FPU_ANY__)
	mov.l set_fpscr_k, r1
	mov #4,r4
	jsr @r1
	shll16 r4	! Set DN bit (flush denormal inputs to zero)
	lds r3,fpscr	! Switch to default precision
#endif /* defined (__SH_FPU_ANY__) */

#ifdef VBR_SETUP
	! save the existing contents of the vbr
	! there will only be a prior value when using something like redboot
	! otherwise it will be zero
	stc	vbr, r1
	mov.l	old_vbr_k, r2
	mov.l	r1, @r2
	! setup vbr
	mov.l	vbr_start_k, r1
	ldc	r1,vbr
#endif /* VBR_SETUP */

	! if an rtos is exporting a timer start fn,
	! then pick up an SR which does not enable ints
	! (the rtos will take care of this)
	mov.l rtos_start_fn, r0
	mov.l sr_initial_bare, r1
	tst	r0, r0
	bt	set_sr

	mov.l sr_initial_rtos, r1

set_sr:
	! Set status register (sr)
	ldc	r1, sr

	! arrange for exit to call fini
	mov.l	atexit_k,r0
	mov.l	fini_k,r4
	jsr	@r0
	nop

	! call init
	mov.l	init_k,r0
	jsr	@r0
	nop

	! call the mainline	
	mov.l	main_k,r0
	jsr	@r0
	nop

	! call exit
	mov	r0,r4
	mov.l	exit_k,r0
	jsr	@r0
	nop
	
	.align 2
#if defined (__SH_FPU_ANY__)
set_fpscr_k:
	.long	___set_fpscr
#endif /*  defined (__SH_FPU_ANY__) */

stack_k:
	.long	_stack	
edata_k:
	.long	_edata
end_k:
	.long	_end
main_k:
	.long	___setup_argv_and_call_main
exit_k:
	.long	_exit
atexit_k:
	.long	_atexit
init_k:
	.long	_init
fini_k:
	.long	_fini
#ifdef VBR_SETUP
old_vbr_k:
	.long	old_vbr
vbr_start_k:
	.long	vbr_start
#endif /* VBR_SETUP */
	
sr_initial_rtos:
	! Privileged mode RB 1 BL 0. Keep BL 0 to allow default trap handlers to work.
	! Whether profiling or not, keep interrupts masked,
	! the RTOS will enable these if required.
	.long 0x600000f1 

rtos_start_fn:
	.long ___rtos_profiler_start_timer
	
sr_initial_bare:
	! Privileged mode RB 1 BL 0. Keep BL 0 to allow default trap handlers to work.
	! Keep interrupts disabled - the application will enable as required.
	.long 0x600000f1

	! supplied for backward compatibility only, in case of linking
	! code whose main() was compiled with an older version of GCC.
	.global ___main
___main:
	rts
	nop
#ifdef VBR_SETUP
! Exception handlers	
	.balign 256
vbr_start:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	bf 1f
	! no previous vbr - jump to own generic handler
	bra handler
	nop
1:	! there was a previous handler - chain them
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr

	.balign 256
vbr_100:
	! Non profiling case.
handler_100:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	bf 1f
	! no previous vbr - jump to own generic handler
	bra handler
	nop	
1:	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x2, r0     ! add 0x100 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:	
	.long old_vbr

	.balign 256
vbr_200:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	bf 1f
	! no previous vbr - jump to own generic handler
	bra handler
	nop	
1:	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x7f, r0	 ! 0x17d
	add #0x7f, r0    ! 0x1fc
	add #0x4, r0     ! add 0x200 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr

	.balign 256
vbr_300:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	bf 1f
	! no previous vbr - jump to own generic handler
	bra handler
	nop	
1:	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x7f, r0	 ! 0x17d
	add #0x7f, r0    ! 0x1fc
	add #0x7f, r0	 ! 0x27b
	add #0x7f, r0    ! 0x2fa
	add #0x6, r0     ! add 0x300 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr

	.balign 256	
vbr_400:	! Should be at vbr+0x400
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	! no previous vbr - jump to own generic handler
	bt handler
	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x7f, r0	 ! 0x17d
	add #0x7f, r0    ! 0x1fc
	add #0x7f, r0	 ! 0x27b
	add #0x7f, r0    ! 0x2fa
	add #0x7f, r0	 ! 0x379
	add #0x7f, r0    ! 0x3f8
	add #0x8, r0     ! add 0x400 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr
handler:
	/* If the trap handler is there call it */
	mov.l	superh_trap_handler_k, r0
	cmp/eq	#0, r0       ! True if zero.
	bf 3f
	bra   chandler
	nop
3:	
	! Here handler available, call it. 
	/* Now call the trap handler with as much of the context unchanged as possible.
	   Move trapping address into PR to make it look like the trap point */
	stc spc, r1
	lds r1, pr
	mov.l expevt_k, r4
	mov.l @r4, r4 ! r4 is value of expevt, first parameter.
	mov r1, r5   ! Remember trapping pc.
	mov r1, r6   ! Remember trapping pc.
	mov.l chandler_k, r1
	mov.l superh_trap_handler_k, r2
	! jmp to trap handler to avoid disturbing pr. 
	jmp @r2
	nop

	.balign 256
vbr_500:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	! no previous vbr - jump to own generic handler
	bt handler
	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x7f, r0	 ! 0x17d
	add #0x7f, r0    ! 0x1fc
	add #0x7f, r0	 ! 0x27b
	add #0x7f, r0    ! 0x2fa
	add #0x7f, r0	 ! 0x379
	add #0x7f, r0    ! 0x3f8
	add #0x7f, r0	 ! 0x477
	add #0x7f, r0    ! 0x4f6
	add #0xa, r0     ! add 0x500 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr

	.balign 256
vbr_600:
	mov.l 2f, r0     ! load the old vbr setting (if any)
	mov.l @r0, r0
	cmp/eq #0, r0
	! no previous vbr - jump to own handler
	bt chandler
	! there was a previous handler - chain them
	add #0x7f, r0	 ! 0x7f
	add #0x7f, r0	 ! 0xfe
	add #0x7f, r0	 ! 0x17d
	add #0x7f, r0    ! 0x1fc
	add #0x7f, r0	 ! 0x27b
	add #0x7f, r0    ! 0x2fa
	add #0x7f, r0	 ! 0x379
	add #0x7f, r0    ! 0x3f8
	add #0x7f, r0	 ! 0x477
	add #0x7f, r0    ! 0x4f6
	add #0x7f, r0	 ! 0x575
	add #0x7f, r0    ! 0x5f4
	add #0xc, r0     ! add 0x600 without corrupting another register
	jmp @r0
	nop
	.balign 4
2:
	.long old_vbr
chandler:
	mov.l expevt_k, r4
	mov.l @r4, r4 ! r4 is value of expevt hence making this the return code
	mov.l handler_exit_k,r0
	jsr   @r0
	nop
	! We should never return from _exit but in case we do we would enter the
	! the following tight loop
limbo:
	bra limbo
	nop
	.balign 4
expevt_k:
	.long 0xff000024 ! Address of expevt
chandler_k:	
	.long chandler	
superh_trap_handler_k:
	.long	__superh_trap_handler
handler_exit_k:
	.long _exit
	.align 2
! Simulated compile of trap handler.
	.section	.debug_abbrev,"",@progbits
.Ldebug_abbrev0:
	.section	.debug_info,"",@progbits
.Ldebug_info0:
	.section	.debug_line,"",@progbits
.Ldebug_line0:
	.text
.Ltext0:
	.align 5
	.type	__superh_trap_handler,@function
__superh_trap_handler:
.LFB1:
	mov.l	r14,@-r15
.LCFI0:
	add	#-4,r15
.LCFI1:
	mov	r15,r14
.LCFI2:
	mov.l	r4,@r14
	lds	r1, pr
	add	#4,r14
	mov	r14,r15
	mov.l	@r15+,r14
	rts	
	nop
.LFE1:
.Lfe1:
	.size	__superh_trap_handler,.Lfe1-__superh_trap_handler
	.section	.debug_frame,"",@progbits
.Lframe0:
	.ualong	.LECIE0-.LSCIE0
.LSCIE0:
	.ualong	0xffffffff
	.byte	0x1
	.string	""
	.uleb128 0x1
	.sleb128 -4
	.byte	0x11
	.byte	0xc
	.uleb128 0xf
	.uleb128 0x0
	.align 2
.LECIE0:
.LSFDE0:
	.ualong	.LEFDE0-.LASFDE0
.LASFDE0:
	.ualong	.Lframe0
	.ualong	.LFB1
	.ualong	.LFE1-.LFB1
	.byte	0x4
	.ualong	.LCFI0-.LFB1
	.byte	0xe
	.uleb128 0x4
	.byte	0x4
	.ualong	.LCFI1-.LCFI0
	.byte	0xe
	.uleb128 0x8
	.byte	0x8e
	.uleb128 0x1
	.byte	0x4
	.ualong	.LCFI2-.LCFI1
	.byte	0xd
	.uleb128 0xe
	.align 2
.LEFDE0:
	.text
.Letext0:
	.section	.debug_info
	.ualong	0xb3
	.uaword	0x2
	.ualong	.Ldebug_abbrev0
	.byte	0x4
	.uleb128 0x1
	.ualong	.Ldebug_line0
	.ualong	.Letext0
	.ualong	.Ltext0
	.string	"trap_handler.c"
	.string	"xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
	.string	"GNU C 3.2 20020529 (experimental)"
	.byte	0x1
	.uleb128 0x2
	.ualong	0xa6
	.byte	0x1
	.string	"_superh_trap_handler"
	.byte	0x1
	.byte	0x2
	.byte	0x1
	.ualong	.LFB1
	.ualong	.LFE1
	.byte	0x1
	.byte	0x5e
	.uleb128 0x3
	.string	"trap_reason"
	.byte	0x1
	.byte	0x1
	.ualong	0xa6
	.byte	0x2
	.byte	0x91
	.sleb128 0
	.byte	0x0
	.uleb128 0x4
	.string	"unsigned int"
	.byte	0x4
	.byte	0x7
	.byte	0x0
	.section	.debug_abbrev
	.uleb128 0x1
	.uleb128 0x11
	.byte	0x1
	.uleb128 0x10
	.uleb128 0x6
	.uleb128 0x12
	.uleb128 0x1
	.uleb128 0x11
	.uleb128 0x1
	.uleb128 0x3
	.uleb128 0x8
	.uleb128 0x1b
	.uleb128 0x8
	.uleb128 0x25
	.uleb128 0x8
	.uleb128 0x13
	.uleb128 0xb
	.byte	0x0
	.byte	0x0
	.uleb128 0x2
	.uleb128 0x2e
	.byte	0x1
	.uleb128 0x1
	.uleb128 0x13
	.uleb128 0x3f
	.uleb128 0xc
	.uleb128 0x3
	.uleb128 0x8
	.uleb128 0x3a
	.uleb128 0xb
	.uleb128 0x3b
	.uleb128 0xb
	.uleb128 0x27
	.uleb128 0xc
	.uleb128 0x11
	.uleb128 0x1
	.uleb128 0x12
	.uleb128 0x1
	.uleb128 0x40
	.uleb128 0xa
	.byte	0x0
	.byte	0x0
	.uleb128 0x3
	.uleb128 0x5
	.byte	0x0
	.uleb128 0x3
	.uleb128 0x8
	.uleb128 0x3a
	.uleb128 0xb
	.uleb128 0x3b
	.uleb128 0xb
	.uleb128 0x49
	.uleb128 0x13
	.uleb128 0x2
	.uleb128 0xa
	.byte	0x0
	.byte	0x0
	.uleb128 0x4
	.uleb128 0x24
	.byte	0x0
	.uleb128 0x3
	.uleb128 0x8
	.uleb128 0xb
	.uleb128 0xb
	.uleb128 0x3e
	.uleb128 0xb
	.byte	0x0
	.byte	0x0
	.byte	0x0
	.section	.debug_pubnames,"",@progbits
	.ualong	0x27
	.uaword	0x2
	.ualong	.Ldebug_info0
	.ualong	0xb7
	.ualong	0x67
	.string	"_superh_trap_handler"
	.ualong	0x0
	.section	.debug_aranges,"",@progbits
	.ualong	0x1c
	.uaword	0x2
	.ualong	.Ldebug_info0
	.byte	0x4
	.byte	0x0
	.uaword	0x0
	.uaword	0x0
	.ualong	.Ltext0
	.ualong	.Letext0-.Ltext0
	.ualong	0x0
	.ualong	0x0
#endif /* VBR_SETUP */
#endif /* ! __SH5__ */