Hi,
answering to myself again ;)
Now, I found where the PC is wrongly set to 0x0:
In translate-all.c, end of function cpu_restore_state() (lines
with '+' are debug output added):
#elif defined(TARGET_MIPS)
+ printf("PC before: 0x%08x, j: %d, OPC_BUF_SIZE: %d\n",
env->PC, j, OPC_BUF_SIZE);
+ for(c = 0; c < OPC_BUF_SIZE; c++)
+ printf("OPC %03d: 0x%08x\n", c, gen_opc_pc[c]);
env->PC = gen_opc_pc[j];
+ printf("PC after: 0x%08x\n", env->PC);
env->hflags &= ~MIPS_HFLAG_BMASK;
env->hflags |= gen_opc_hflags[j];
#endif
results in the following output (0x80010400 is the correct one):
PC before: 0x80010400, j: -8185, OPC_BUF_SIZE: 512
OPC 000: 0x00000000
OPC 001: 0x00000000
...
OPC 510: 0x00000000
OPC 511: 0x00000000
PC after: 0x00000000
If I temporarily delete the line "env->PC = gen_opc_pc[j];"
single stepping seems to work.
Seems that gen_opc_pc is all 0, and j looks strange. But I
don't know whats wrong here? ;(
Best regards
Dirk
Dirk Behme wrote:
I try to debug some low level system init code on MIPS
as well. For this, I use qemu-snapshot-2006-03-21_23 because this
already includes little endian MIPS (--target-list=mipsel-softmmu). I
can load my program to MIPS default start address 0x80010000, use
mipsel-linux-gdb to attach to it and load symbols. Start address is
set correctly. But seems that I have trouble single stepping (si). I
would assume that with first si system should jump to 0x80010400
(please find some debug output below). Instead, PC is set to 0x0.
*1* Debug output for single step at startup. PC is set to 0x0 instead
to next command at 0x80010400
_start ()
at uboot/u-boot-1.1.4/cpu/mips/start.S:43
43 RVECENT(reset,0) /* U-boot entry point */
(gdb) p/x $pc
$1 = 0x80010000
(gdb) x/2i $pc
0x80010000 <_start>: b 0x80010400 <reset>
0x80010004 <_start+4>: nop
(gdb) si
0x00000000 in ?? ()
(gdb) p/x $pc
$2 = 0x0
(gdb)
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