138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/*
|
|
* googlesnow - run google snow firmware in user mode
|
|
*
|
|
* Copyright (C) 2013 The ChromiumOS Authors. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <err.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include <string.h>
|
|
|
|
enum addresses {
|
|
regs = 0x10000000,
|
|
sram = 0x2020000,
|
|
sramsize = 0x77fff,
|
|
};
|
|
|
|
// 0x20234b0
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd;
|
|
int devmem;
|
|
void *regbase;
|
|
void *srambase;
|
|
void (*coreboot)(void) = (void *)0x2023400;
|
|
|
|
if (argc != 3)
|
|
errx(1, "usage: runbios rom-file start-address");
|
|
|
|
fd = open(argv[1], 2);
|
|
if (fd < 0)
|
|
err(1, argv[1]);
|
|
devmem = open("/dev/mem", 2);
|
|
if (devmem < 0)
|
|
err(1, argv[1]);
|
|
srambase = mmap((void *)sram, sramsize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
|
|
if (-1 == (int)sram)
|
|
err(1, "mmap");
|
|
memset((void *)sram, 0xff, sramsize);
|
|
|
|
/* now sort of do what bl1 does: read the 'rom' into the sram */
|
|
/* skip the bl1. We don't run it. */
|
|
if (pread(fd, coreboot, 30*1024, 0x2000) < 30*1024)
|
|
err(1, "read 'rom'");
|
|
/* you want to be in gdb at this point. */
|
|
coreboot = (void *) (strtoul(argv[2], 0, 0));
|
|
coreboot();
|
|
}
|
|
#if 0
|
|
/* cc -g googlesnow.c */
|
|
/* typical run
|
|
gdb a.out
|
|
(gdb) list 50
|
|
|
|
45 i2c = mmap((void *)0x12c60000, 0x10000, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, devmem, (off_t) 0x12c60000);
|
|
46 if (-1 == (int)i2c)
|
|
47 err(1, "mmap i2c");
|
|
48
|
|
49 /* now sort of do what bl1 does: read the 'rom' into the sram */
|
|
50 if (pread(fd, coreboot, 30*1024, 0x2000) < 30*1024)
|
|
51 err(1, "read 'rom'");
|
|
52 /* you want to be in gdb at this point. */
|
|
53 coreboot = (void *) strtoull(argv[2], 0, 0);
|
|
54 coreboot();
|
|
(gdb) br 54
|
|
Breakpoint 3 at 0x8798: file runbios.c, line 54.
|
|
(gdb) run ~/coreboot/build/coreboot.rom 0x020234b0
|
|
The program being debugged has been started already.
|
|
Start it from the beginning? (y or n) y
|
|
|
|
Starting program: /root/coreboot/util/runarmbios/a.out ~/coreboot/build/coreboot.rom 0x020234b0
|
|
|
|
Breakpoint 3, main (argc=3, argv=0x7efff7c4) at runbios.c:54
|
|
54 coreboot();
|
|
(gdb) symbol-file ~/coreboot/build/cbfs/fallback/bootblock.debug
|
|
Load new symbol table from "/root/coreboot/build/cbfs/fallback/bootblock.debug"? (y or n) y
|
|
Reading symbols from /root/coreboot/build/cbfs/fallback/bootblock.debug...done.
|
|
Error in re-setting breakpoint 3: No source file named runbios.c.
|
|
(gdb) display/i $pc
|
|
1: x/i $pc
|
|
=> 0x8798: ldr r3, [r11, #-8]
|
|
(gdb) stepi
|
|
0x0000879c in ?? ()
|
|
1: x/i $pc
|
|
=> 0x879c: blx r3
|
|
(gdb)
|
|
0x020234b0 in call_bootblock ()
|
|
1: x/i $pc
|
|
=> 0x20234b0 <call_bootblock>: ldr sp, [pc, #3800] ; 0x2024390
|
|
(gdb)
|
|
0x020234b4 in call_bootblock ()
|
|
1: x/i $pc
|
|
=> 0x20234b4 <call_bootblock+4>: bic sp, sp, #7
|
|
(gdb)
|
|
0x020234b8 in call_bootblock ()
|
|
1: x/i $pc
|
|
=> 0x20234b8 <call_bootblock+8>: mov r0, #0
|
|
(gdb)
|
|
0x020234bc in call_bootblock ()
|
|
1: x/i $pc
|
|
=> 0x20234bc <call_bootblock+12>: blx 0x20244b8 <main>
|
|
(gdb)
|
|
main (bist=0) at src/arch/arm/bootblock_simple.c:37
|
|
37 {
|
|
1: x/i $pc
|
|
=> 0x20244b8 <main>: push {r3, lr}
|
|
(gdb)
|
|
42 bootblock_mainboard_init();
|
|
1: x/i $pc
|
|
=> 0x20244ba <main+2>: bl 0x2023c08 <bootblock_mainboard_init>
|
|
(gdb)
|
|
bootblock_mainboard_init () at src/mainboard/google/snow/bootblock.c:2124
|
|
2124 {
|
|
1: x/i $pc
|
|
=> 0x2023c08 <bootblock_mainboard_init>: stmdb sp!, {r4, r5, r6, r7, r9, r10, r11, lr}
|
|
(gdb)
|
|
2127 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
1: x/i $pc
|
|
=> 0x2023c0c <bootblock_mainboard_init+4>: movs r1, #0
|
|
|
|
Note you are now debugging source, and pretty much all commands work.
|
|
*/
|
|
#endif
|