diff options
Diffstat (limited to 'sys/arch/wgrisc/stand/boot/start.S')
| -rw-r--r-- | sys/arch/wgrisc/stand/boot/start.S | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sys/arch/wgrisc/stand/boot/start.S b/sys/arch/wgrisc/stand/boot/start.S new file mode 100644 index 00000000000..70535726c56 --- /dev/null +++ b/sys/arch/wgrisc/stand/boot/start.S @@ -0,0 +1,130 @@ +/* $OpenBSD: start.S,v 1.1 1997/05/11 16:17:54 pefo Exp $ */ + +/* + * Copyright (c) 1997 Per Fogelstrom + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed under OpenBSD by + * Per Fogelstrom. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#define ABICALLS + +#include <machine/regdef.h> +#include <machine/asm.h> + +/* + * Frame required for the debugger (if we have any) + */ +#define START_FRAME ((4 * 4) + 4 + 4) + + .globl __start +__start: + .set noreorder + la gp, _gp + la sp, __start - START_FRAME # Stack below program + sw zero, START_FRAME - 4(sp) # Zero out old ra for debugger + sw zero, START_FRAME - 8(sp) # Zero out old fp for debugger + move s0, a0 # save argc + move s1, a1 # save argv + + la a0, edata # clear BSS + li a1, 0 + la a2, end + jal memset # memset(edata, 0, end - edata) + subu a2, a2, a0 + + move a0, s0 # restore argc + jal main # main(argc, argv) + move a1, s1 # restore argv + + j restart # restart... + nop + +/* dummy routine for gcc2 */ +LEAF(__main) + j ra + nop +END(__main) + +/* + * Boot rom entrypoints. + */ + +#define BOOTVEC 0xbfc00500 /* Address of boot vector table */ + +NON_LEAF(getchar, STAND_FRAME_SIZE, ra) + .mask 0x80000000, (STAND_RA_OFFSET - STAND_FRAME_SIZE) + subu sp, sp, STAND_FRAME_SIZE + sw ra, STAND_RA_OFFSET(sp) + + move a1, sp + li a0, 0 + li a2, 1 + jal prom_read + + lbu v0, 0(sp) + lw ra, STAND_RA_OFFSET(sp) + addu sp, sp, STAND_FRAME_SIZE + jr ra +END(getchar) + +LEAF(putchar) + sb a0, 0(sp) + move a1, sp + li a0, 1 /* Stdout */ + li a2, 1 + b prom_write + +END(putchar) + +LEAF(restart) +END(restart) + +LEAF(panic) +END(panic) + +LEAF(disk_open) + lw v0, BOOTVEC+96 + jr v0 +END(disk_open) + +LEAF(disk_read) + lw v0, BOOTVEC+100 + jr v0 +END(disk_read) + + +LEAF(prom_read) + lw v0, BOOTVEC+0 + jr v0 +END(prom_read) + +LEAF(prom_write) + lw v0, BOOTVEC+4 + jr v0 +END(prom_write) |