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S390 GDB stub 

In order to debug funny kernel breakages it's always good to have a working
gdb stub around.

While Uli's patches don't include one one, I needed one that's at least good
enough for 'bt' and some variable examinations during early bootup.

So here it is - the absolute basics to get the qemu gdb stub running with s390x
targets.

Sgined-off-by: Alexander Graf <agraf@suse.de>

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Alexander Graf 2009-12-05 12:44:29 +01:00 committed by Aurelien Jarno
parent 8cb310e130
commit afcb0e4559
1 changed files with 52 additions and 0 deletions
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52
gdbstub.c
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@ -1348,6 +1348,55 @@ static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
return 8;
}
#elif defined (TARGET_S390X)
#define NUM_CORE_REGS S390_NUM_TOTAL_REGS
static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
{
switch (n) {
case S390_PSWM_REGNUM: GET_REGL(env->psw.mask); break;
case S390_PSWA_REGNUM: GET_REGL(env->psw.addr); break;
case S390_R0_REGNUM ... S390_R15_REGNUM:
GET_REGL(env->regs[n-S390_R0_REGNUM]); break;
case S390_A0_REGNUM ... S390_A15_REGNUM:
GET_REG32(env->aregs[n-S390_A0_REGNUM]); break;
case S390_FPC_REGNUM: GET_REG32(env->fpc); break;
case S390_F0_REGNUM ... S390_F15_REGNUM:
/* XXX */
break;
case S390_PC_REGNUM: GET_REGL(env->psw.addr); break;
case S390_CC_REGNUM: GET_REG32(env->cc); break;
}
return 0;
}
static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
{
target_ulong tmpl;
uint32_t tmp32;
int r = 8;
tmpl = ldtul_p(mem_buf);
tmp32 = ldl_p(mem_buf);
switch (n) {
case S390_PSWM_REGNUM: env->psw.mask = tmpl; break;
case S390_PSWA_REGNUM: env->psw.addr = tmpl; break;
case S390_R0_REGNUM ... S390_R15_REGNUM:
env->regs[n-S390_R0_REGNUM] = tmpl; break;
case S390_A0_REGNUM ... S390_A15_REGNUM:
env->aregs[n-S390_A0_REGNUM] = tmp32; r=4; break;
case S390_FPC_REGNUM: env->fpc = tmp32; r=4; break;
case S390_F0_REGNUM ... S390_F15_REGNUM:
/* XXX */
break;
case S390_PC_REGNUM: env->psw.addr = tmpl; break;
case S390_CC_REGNUM: env->cc = tmp32; r=4; break;
}
return r;
}
#else
#define NUM_CORE_REGS 0
@ -1616,6 +1665,9 @@ static void gdb_set_cpu_pc(GDBState *s, target_ulong pc)
s->c_cpu->pc = pc;
#elif defined (TARGET_ALPHA)
s->c_cpu->pc = pc;
#elif defined (TARGET_S390X)
cpu_synchronize_state(s->c_cpu);
s->c_cpu->psw.addr = pc;
#endif
}