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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <nwtypes.h>
#include <nwdfs.h>
#include <nwconio.h>
#include <nwadv.h>
#include <nwdbgapi.h>
#include <nwthread.h>
#include "ppc.h"
extern char *mem2hex (void *mem, char *buf, int count, int may_fault);
extern char *hex2mem (char *buf, void *mem, int count, int may_fault);
extern int computeSignal (int exceptionVector);
void
flush_i_cache (void)
{
}
/* Get the registers out of the frame information. */
void
frame_to_registers (struct StackFrame *frame, char *regs)
{
mem2hex (&frame->ExceptionState.CsavedRegs, ®s[GP0_REGNUM * 4 * 2], 4 * 32, 0);
mem2hex (&frame->ExceptionState.CSavedFPRegs, ®s[FP0_REGNUM * 4 * 2], 4 * 32, 0);
mem2hex (&frame->ExceptionPC, ®s[PC_REGNUM * 4 * 2], 4 * 1, 0);
mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, ®s[CR_REGNUM * 4 * 2], 4 * 1, 0);
mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, ®s[LR_REGNUM * 4 * 2], 4 * 1, 0);
mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, ®s[CTR_REGNUM * 4 * 2], 4 * 1, 0);
mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, ®s[XER_REGNUM * 4 * 2], 4 * 1, 0);
mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, ®s[MQ_REGNUM * 4 * 2], 4 * 1, 0);
}
/* Put the registers back into the frame information. */
void
registers_to_frame (char *regs, struct StackFrame *frame)
{
hex2mem (®s[GP0_REGNUM * 4 * 2], &frame->ExceptionState.CsavedRegs, 4 * 32, 0);
hex2mem (®s[FP0_REGNUM * 4 * 2], &frame->ExceptionState.CSavedFPRegs, 4 * 32, 0);
hex2mem (®s[PC_REGNUM * 4 * 2], &frame->ExceptionPC, 4 * 1, 0);
hex2mem (®s[CR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, 4 * 1, 0);
hex2mem (®s[LR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, 4 * 1, 0);
hex2mem (®s[CTR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, 4 * 1, 0);
hex2mem (®s[XER_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, 4 * 1, 0);
hex2mem (®s[MQ_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, 4 * 1, 0);
}
extern volatile int mem_err;
#ifdef ALTERNATE_MEM_FUNCS
extern int ReadByteAltDebugger (char* addr, char *theByte);
extern int WriteByteAltDebugger (char* addr, char theByte);
int
get_char (char *addr)
{
char c;
if (!ReadByteAltDebugger (addr, &c))
mem_err = 1;
return c;
}
void
set_char (char *addr, int val)
{
if (!WriteByteAltDebugger (addr, val))
mem_err = 1;
}
#endif
int
mem_write (char *dst, char *src, int len)
{
while (len-- && !mem_err)
set_char (dst++, *src++);
return mem_err;
}
union inst
{
LONG l;
struct
{
union
{
struct /* Unconditional branch */
{
unsigned opcode : 6; /* 18 */
signed li : 24;
unsigned aa : 1;
unsigned lk : 1;
} b;
struct /* Conditional branch */
{
unsigned opcode : 6; /* 16 */
unsigned bo : 5;
unsigned bi : 5;
signed bd : 14;
unsigned aa : 1;
unsigned lk : 1;
} bc;
struct /* Conditional branch to ctr or lr reg */
{
unsigned opcode : 6; /* 19 */
unsigned bo : 5;
unsigned bi : 5;
unsigned type : 15; /* 528 = ctr, 16 = lr */
unsigned lk : 1;
} bclr;
} variant;
} inst;
};
static LONG saved_inst;
static LONG *saved_inst_pc = 0;
static LONG saved_target_inst;
static LONG *saved_target_inst_pc = 0;
void
set_step_traps (struct StackFrame *frame)
{
union inst inst;
LONG *target;
int opcode;
int ra, rb;
LONG *pc = (LONG *)frame->ExceptionPC;
inst.l = *pc++;
opcode = inst.inst.variant.b.opcode;
target = pc;
switch (opcode)
{
case 18: /* Unconditional branch */
if (inst.inst.variant.b.aa) /* Absolute? */
target = 0;
target += inst.inst.variant.b.li;
break;
case 16: /* Conditional branch */
if (!inst.inst.variant.bc.aa) /* Absolute? */
target = 0;
target += inst.inst.variant.bc.bd;
break;
case 19: /* Cond. branch via ctr or lr reg */
switch (inst.inst.variant.bclr.type)
{
case 528: /* ctr */
target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR;
break;
case 16: /* lr */
target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR;
break;
}
break;
}
saved_inst = *pc;
mem_write (pc, breakpoint_insn, BREAKPOINT_SIZE);
saved_inst_pc = pc;
if (target != pc)
{
saved_target_inst = *target;
mem_write (target, breakpoint_insn, BREAKPOINT_SIZE);
saved_target_inst_pc = target;
}
}
/* Remove step breakpoints. Returns non-zero if pc was at a step breakpoint,
zero otherwise. This routine works even if there were no step breakpoints
set. */
int
clear_step_traps (struct StackFrame *frame)
{
int retcode;
LONG *pc = (LONG *)frame->ExceptionPC;
if (saved_inst_pc == pc || saved_target_inst_pc == pc)
retcode = 1;
else
retcode = 0;
if (saved_inst_pc)
{
mem_write (saved_inst_pc, saved_inst, BREAKPOINT_SIZE);
saved_inst_pc = 0;
}
if (saved_target_inst_pc)
{
mem_write (saved_target_inst_pc, saved_target_inst, BREAKPOINT_SIZE);
saved_target_inst_pc = 0;
}
return retcode;
}
void
do_status (char *ptr, struct StackFrame *frame)
{
int sigval;
sigval = computeSignal (frame->ExceptionNumber);
sprintf (ptr, "T%02x", sigval);
ptr += 3;
sprintf (ptr, "%02x:", PC_REGNUM);
ptr = mem2hex (&frame->ExceptionPC, ptr + 3, 4, 0);
*ptr++ = ';';
sprintf (ptr, "%02x:", SP_REGNUM);
ptr = mem2hex (&frame->ExceptionState.CsavedRegs[SP_REGNUM], ptr + 3, 4, 0);
*ptr++ = ';';
sprintf (ptr, "%02x:", LR_REGNUM);
ptr = mem2hex (&frame->ExceptionState.CsavedRegs[LR_REGNUM], ptr + 3, 4, 0);
*ptr++ = ';';
*ptr = '\000';
}
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