first commit: hello world

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..9a14c92
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+*.o
+*.d
+*.swp
+*.elf
+*.ecoff
+disasm

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..811fe64
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,31 @@
+obj = test.o
+elf = test.elf
+bin = test.ecoff
+
+TC = mips-none-elf-
+CC = $(TC)gcc
+AS = $(TC)as
+LD = $(TC)ld
+
+ASFLAGS = -mips3 -mabi=32 -mno-abicalls -G 0 -fno-pic
+LDFLAGS = -T o2.ld
+
+$(bin): $(elf)
+       wreckoff $< $@
+
+$(elf): $(obj)
+       $(LD) -o $@ $(obj) $(LDFLAGS)
+
+.PHONY: clean
+clean:
+       rm -f $(obj) $(elf) $(bin)
+
+.PHONY: install
+install: $(elf)
+       cp $(elf) $(bin) /srv/tftp/
+
+#disasm: $(bin)
+#      mips-ecoff-objdump -D $< >$@
+#
+disasm: $(elf)
+       $(TC)objdump -D $< >$@

diff --git a/README b/README
new file mode 100644 (file)
index 0000000..6a91b7a
--- /dev/null
+++ b/README
@@ -0,0 +1,4 @@
+To run:
+  - on boot enter maintenance mode
+  - go to the command monitor
+  - type: bootp():test.elf

diff --git a/o2.ld b/o2.ld
new file mode 100644 (file)
index 0000000..6e3256f
--- /dev/null
+++ b/o2.ld
@@ -0,0 +1,28 @@
+OUTPUT_FORMAT("elf32-bigmips")
+OUTPUT_ARCH(mips)
+ENTRY(_start)
+
+SECTIONS {
+       . = 0x81404000;
+
+       .text : {
+               * (.text);
+               * (.rel.text);
+       }
+
+       .rodata ALIGN(4): {
+               * (.rodata);
+       }
+
+       .data ALIGN(4): {
+               * (.data);
+       }
+
+       .bss ALIGN(4): {
+               _bss_start = .;
+               * (.bss);
+               . = ALIGN(4);
+               _bss_end = .;
+       }
+       _bss_size = SIZEOF(.bss);
+}

diff --git a/regdefs.h b/regdefs.h
new file mode 100644 (file)
index 0000000..cc85cb7
--- /dev/null
+++ b/regdefs.h
@@ -0,0 +1,43 @@
+#ifndef REGDEFS_H_
+#define REGDEFS_H_
+
+#define zero   $0
+#define AT             $1
+#define v0             $2
+#define v1             $3
+#define a0             $4
+#define a1             $5
+#define a2             $6
+#define a3             $7
+#define t0             $8
+#define t1             $9
+#define t2             $10
+#define t3             $11
+#define t4             $12
+#define ta0            $12
+#define t5             $13
+#define ta1            $13
+#define t6             $14
+#define ta2            $14
+#define t7             $15
+#define ta3            $15
+#define s0             $16
+#define s1             $17
+#define s2             $18
+#define s3             $19
+#define s4             $20
+#define s5             $21
+#define s6             $22
+#define s7             $23
+#define t8             $24
+#define t9             $25
+#define jp             $25
+#define k0             $26
+#define k1             $27
+#define gp             $28
+#define sp             $29
+#define fp             $30
+#define s8             $30
+#define ra             $31
+
+#endif

diff --git a/test.S b/test.S
new file mode 100644 (file)
index 0000000..e1d85a3
--- /dev/null
+++ b/test.S
@@ -0,0 +1,147 @@
+#include "regdefs.h"
+
+       .set noreorder
+       .text
+
+       .equ SPB_FWVEC_ADDR, 0x80001020
+
+       .equ FW_HALT_OFFS, 0x0c
+       .equ FW_RST_INTERACT_OFFS, 0x1c
+       .equ FW_WRITE_OFFS, 0x6c
+
+       .globl _start
+_start:
+       jal print_pc
+       nop
+
+       li a0, 0xbaadf00d
+       jal print_hex
+       nop
+       la t0, buffer
+       li t1, '\n'
+       sb t1, 0(t0)
+       sb zero, 1(t0)
+       la a0, buffer
+       jal printstr
+       nop
+
+
+       la a0, hellostr
+       jal printstr
+       nop
+       la a0, foobar
+       jal printstr
+       nop
+0:     b 0b
+       nop
+
+print_pc:
+       addiu sp, sp, -20
+       sw ra, 16(sp)
+
+       la a0, buffer
+       li t1, 'P'
+       sb t1, 0(a0)
+       li t1, 'C'
+       sb t1, 1(a0)
+       li t1, ':'
+       sb t1, 2(a0)
+       sb zero, 3(a0)
+       jal printstr
+       nop
+
+       lw a0, 16(sp)
+       jal print_hex
+       addiu a0, a0, -8        # bd: address of the jal instruction to arg0
+
+       la t0, buffer
+       li t1, '\n'
+       sb t1, 0(t0)
+       sb zero, 1(t0)
+       la a0, buffer
+       jal printstr
+       nop
+
+       lw ra, 16(sp)
+       jr ra
+       addiu sp, sp, 20        # bd
+
+
+print_hex:
+       addiu sp, sp, -20
+       sw ra, 16(sp)
+
+       la t0, buffer
+       li t3, 8                # 8 nibbles to format
+.Ltop: 
+       addiu t3, t3, -1
+       sll t1, t3, 2
+       srl t1, a0, t1          # shift to low nibble
+       andi t1, t1, 0xf        # and mask off everything above
+       li t2, 9
+       bgt t1, t2, .Lover9
+       nop
+       b .Lstore
+       addiu t1, t1, '0'       # bd
+.Lover9:
+       addiu t1, t1, 'A'-10
+
+.Lstore:
+       sb t1, (t0)
+       bne t3, zero, .Ltop
+       addiu t0, t0, 1         # bd
+
+       sb zero, (t0)   # zero-terminate
+       la a0, buffer
+       jal printstr
+       nop
+
+       lw ra, 16(sp)
+       jr ra
+       addiu sp, sp, 20        # bd
+
+buffer: .space 64
+
+printstr:
+       addiu sp, sp, -20
+       sw ra, 16(sp)
+
+       # compute string length -> a2
+       move t0, a0
+0:     lb t1, (t0)
+       bne t1, zero, 0b
+       addiu t0, t0, 1
+       addiu t0, t0, -1
+       subu a2, t0, a0
+
+       move a1, a0     # buffer pointer
+       li a0, 1        # fd
+       move a3, sp     # count pointer
+
+       lw t0, SPB_FWVEC_ADDR
+       addiu t0, t0, FW_WRITE_OFFS
+       lw t0, (t0)     # grab the write entry point in t0
+       jal t0
+       nop
+       
+       lw ra, 16(sp)
+       jr ra
+       addiu sp, sp, 20        # bd
+
+halt:
+       addiu sp, sp, -20
+       sw ra, 16(sp)
+
+       lw t0, SPB_FWVEC_ADDR
+       addiu t0, t0, FW_HALT_OFFS
+       lw t0, (t0)
+       jal t0
+       nop
+
+       lw ra, 16(sp)
+       jr ra
+       addiu sp, sp, 20
+
+       .data
+hellostr: .asciiz "Hello SGI!\n"
+foobar:        .asciiz "This is a test!\n"