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URL https://opencores.org/ocsvn/openfire2/openfire2/trunk

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  • This comparison shows the changes necessary to convert path 
    /openfire2/trunk/sw/crt
    from Rev 4 to Rev 6
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  •

Rev 4 → Rev 6

/crt-bram.s
0,0 → 1,72
# crt.asm
# C RunTime:
# Used for initialization of small data
# anchors and stack for programs compiled using
# Xilinx Gnu Tools.
# Used for initialization of user's bss area
# All external and static variables are initialized
 
/* Vector map (Interrupts, Exceptions, Breakpoints) */
# # 0x00 # Jump to Start (reset vector)
# # 0x04 # nop
# # 0x08 # Imm instr for soft exception address [Hi halfword]
# # 0x0c # Jump to sof Exception handler [Lo halfword]
# # 0x10 # Imm instr for interrupt address [Hi halfword]
# # 0x14 # Jump to interrupt handler [Lo halfword]
# # 0x18 # nop - Reserved for breakpoint vector
# # 0x1C # nop - Reserved for breakpoint vector
# # 0x20 # Imm instr for hw exception address [Hi halfword]
# # 0x24 # Jump instr to hw exception handler [Lo halfword]
 
.globl _start
.align 2
.ent _start
_start: brai _start1
_vector_sw_exception: brai _exception_handler
_vector_interrupt: brai _interrupt_handler
_vector_breakpoint: brai _breakpoint_handler
_vector_hw_exception: brai _hw_exception_handler
 
/* ------ crt starts here --------- */
 
_start1: /* Set the Small Data Anchors and the Stack pointer */
la r13, r0, _SDA_BASE_
la r2, r0, _SDA2_BASE_
la r1, r0, _STACK_START # stack is at end of block-ram
_crtinit: /* clear sbss */
addi r6,r0,__sbss_start /* SBSS beginning */
addi r7,r0,__sbss_end /* SBSS end */
rsub r18,r6,r7 /* Compare */
blei r18,.Lendsbss
.Lloopsbss:
sw r0,r6,r0
addi r6,r6,4
rsub r18,r6,r7
bgti r18,.Lloopsbss
.Lendsbss: /* clear bss */
addi r6,r0,__bss_start /* BSS beginning */
addi r7,r0,__bss_end /* BSS end */
rsub r18,r6,r7 /* Compare */
blei r18,.Lendbss
.Lloopbss:
sw r0,r6,r0
addi r6,r6,4
rsub r18,r6,r7
bgti r18,.Lloopbss
.Lendbss:
 
brlid r15,main # enter main program (ignoring parameters: r5, r6 & r7)
nop # fall throught to exit
.end _start
 
_exception_handler:
_interrupt_handler:
_breakpoint_handler:
_hw_exception_handler:
 
.globl exit # exit library call
.ent exit
exit:
bri _start1
.end exit
/crt-sram.s
0,0 → 1,51
# crt.asm
# C RunTime:
# Used for initialization of small data
# anchors and stack for programs compiled using
# Xilinx Gnu Tools.
# Used for initialization of user's bss area
# All external and static variables are initialized
 
.globl _start
 
.align 2
.ent _start
_start:
nop /* to help simulation external program without block ram */
/* todo : initialize system vectors */
/* Set the Small Data Anchors and the Stack pointer */
la r13, r0, _SDA_BASE_
la r2, r0, _SDA2_BASE_
la r1, r0, _stack # stack is at end of heap
_crtinit: /* clear sbss */
addi r6,r0,__sbss_start /* SBSS beginning */
addi r7,r0,__sbss_end /* SBSS end */
rsub r18,r6,r7 /* Compare */
blei r18,.Lendsbss
.Lloopsbss:
sw r0,r6,r0
addi r6,r6,4
rsub r18,r6,r7
bgti r18,.Lloopsbss
.Lendsbss: /* clear bss */
addi r6,r0,__bss_start /* BSS beginning */
addi r7,r0,__bss_end /* BSS end */
rsub r18,r6,r7 /* Compare */
blei r18,.Lendbss
.Lloopbss:
sw r0,r6,r0
addi r6,r6,4
rsub r18,r6,r7
bgti r18,.Lloopbss
.Lendbss:
 
brlid r15,main # enter main program (ignoring parameters: r5, r6 & r7)
nop # fall throught to exit
.end _start
 
.globl exit # exit library call
.ent exit
exit:
brai 0x0 # enter monitor again...
.end exit
/Makefile
0,0 → 1,15
all:
mb-as -a=crt-bram.lst -o crt-bram.o crt-bram.s
mb-as -a=crt-sram.lst -o crt-sram.o crt-sram.s
 
clean:
-rm *.o
-rm *.out
-rm *.bin
-rm *.v
-rm *.map
-rm *.lst
-rm *.bak
-rm *.srec
-rm *.prom
-rm *.rom

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