Alexander Voropay wrote:
I'm trying to implement a mips_bios, unfortunately, quemu seems can't
run a code at the 0xbfc00000 region.
See a http://pastebin.com/628591
The conventional 'move k0,zero' instruction (line 35) causes an general
exceprion to 0xbfc00380, see line 70
Try to change the following lines in hw/mips_r4k.c:
//#define KERNEL_LOAD_ADDR 0x80010000
#define KERNEL_LOAD_ADDR 0xBFC00000
//cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
cpu_register_physical_memory(0x1fc00000, ram_size, IO_MEM_RAM);
//kernel_size = load_image(kernel_filename,
// phys_ram_base + (kernel_base - 0x80000000));
kernel_size = load_image(kernel_filename, phys_ram_base);
Works for me:
(gdb) p/x $pc
$1 = 0xbfc00000
(gdb) x/2i $pc
0xbfc00000 <_start>: b 0xbfc00400 <reset>
0xbfc00004 <_start+4>: nop
(gdb) x/2i 0x1fc00000
0x1fc00000: b 0x1fc00400
0x1fc00004: nop
(gdb)
Best regards
Dirk
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