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From: cvs at opencores.org<cvs@o...>
Date: Wed Mar 28 23:30:28 CEST 2007
Subject: [cvs-checkins] MODIFIED: openfire2 ...
Date: 00/07/03 28:23:30

Added: openfire2/sw/crt Makefile crt-bram.s crt-sram-with-int.s
crt-sram.s
Log:



Revision Changes Path
1.1 openfire2/sw/crt/Makefile

http://www.opencores.org/cvsweb.shtml/openfire2/sw/crt/Makefile?rev=1.1&content-type=text/x-cvsweb-markup

Index: Makefile
===================================================================
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
mb-as -a=crt-sram-with-int.lst -o crt-sram-with-int.o crt-sram-with-int.s

clean:
-rm *.o
-rm *.out
-rm *.bin
-rm *.v
-rm *.map
-rm *.lst
-rm *.bak
-rm *.srec
-rm *.prom
-rm *.rom



1.1 openfire2/sw/crt/crt-bram.s

http://www.opencores.org/cvsweb.shtml/openfire2/sw/crt/crt-bram.s?rev=1.1&content-type=text/x-cvsweb-markup

Index: crt-bram.s
===================================================================
# 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:
bri _start1 # 0x00 # reset vector
nop # 0x04
nop # 0x08 # Reserve space for software exception vector
nop # 0x0c
nop # 0x10 # Reserve space for interrupt vector
nop # 0x14
nop # 0x18 # Reserve space for breakpoint vector
nop # 0x1c
nop # 0x18 # Reserve space for hw exception vector
nop # 0x1c

_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 .globl exit # exit library call .ent exit exit: bri exit .end exit 1.1 openfire2/sw/crt/crt-sram-with-int.s http://www.opencores.org/cvsweb.shtml/openfire2/sw/crt/crt-sram-with-int.s?rev=1.1&content-type=text/x-cvsweb-markup Index: crt-sram-with-int.s =================================================================== # 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: la r1,r0,__interrupt_vector_reload /* move interrupt vector call */ lwi r2,r1,0 /* to the vector position in block ram */ swi r2,r0,0x10 lwi r2,r1,4 swi r2,r0,0x14 /* Set the Small Data Anchors and the Stack pointer */ la r13, r0, _SDA_BASE_ la r2, r0, _SDA2_BASE_ la r1, r0, 0x040e2000 # stack is at end of sram (before video 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 .globl exit # exit library call .ent exit exit: brai 0x0 # enter monitor again... .end exit __interrupt_vector_reload: brai interrupt_handler 1.1 openfire2/sw/crt/crt-sram.s http://www.opencores.org/cvsweb.shtml/openfire2/sw/crt/crt-sram.s?rev=1.1&content-type=text/x-cvsweb-markup Index: crt-sram.s =================================================================== # 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: /* 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