415 lines
9.1 KiB
C
415 lines
9.1 KiB
C
#include <nwdfs.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <nwconio.h>
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#include <nwadv.h>
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#include <nwdbgapi.h>
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#include <errno.h>
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#include <nwthread.h>
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#include "ppc.h"
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extern char *mem2hex (void *mem, char *buf, int count, int may_fault);
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extern char *hex2mem (char *buf, void *mem, int count, int may_fault);
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extern int computeSignal (int exceptionVector);
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void
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flush_i_cache (void)
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{
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}
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/* Get the registers out of the frame information. */
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void
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frame_to_registers (frame, regs)
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struct StackFrame *frame;
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char *regs;
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{
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mem2hex (&frame->ExceptionState.CsavedRegs, ®s[GP0_REGNUM * 4 * 2], 4 * 32, 0);
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mem2hex (&frame->ExceptionState.CSavedFPRegs, ®s[FP0_REGNUM * 4 * 2], 4 * 32, 0);
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mem2hex (&frame->ExceptionPC, ®s[PC_REGNUM * 4 * 2], 4 * 1, 0);
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mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, ®s[CR_REGNUM * 4 * 2], 4 * 1, 0);
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mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, ®s[LR_REGNUM * 4 * 2], 4 * 1, 0);
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mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, ®s[CTR_REGNUM * 4 * 2], 4 * 1, 0);
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mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, ®s[XER_REGNUM * 4 * 2], 4 * 1, 0);
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mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, ®s[MQ_REGNUM * 4 * 2], 4 * 1, 0);
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}
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/* Put the registers back into the frame information. */
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void
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registers_to_frame (regs, frame)
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char *regs;
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struct StackFrame *frame;
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{
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hex2mem (®s[GP0_REGNUM * 4 * 2], &frame->ExceptionState.CsavedRegs, 4 * 32, 0);
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hex2mem (®s[FP0_REGNUM * 4 * 2], &frame->ExceptionState.CSavedFPRegs, 4 * 32, 0);
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hex2mem (®s[PC_REGNUM * 4 * 2], &frame->ExceptionPC, 4 * 1, 0);
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hex2mem (®s[CR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, 4 * 1, 0);
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hex2mem (®s[LR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, 4 * 1, 0);
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hex2mem (®s[CTR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, 4 * 1, 0);
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hex2mem (®s[XER_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, 4 * 1, 0);
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hex2mem (®s[MQ_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, 4 * 1, 0);
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}
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extern int ReadByteAltDebugger (char* addr, char *theByte);
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extern int WriteByteAltDebugger (char* addr, char theByte);
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extern volatile int mem_err;
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int
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get_char (addr)
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char *addr;
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{
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char c;
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if (!ReadByteAltDebugger (addr, &c))
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mem_err = 1;
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return c;
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}
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void
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set_char (addr, val)
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char *addr;
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int val;
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{
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if (!WriteByteAltDebugger (addr, val))
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mem_err = 1;
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}
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int
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mem_write (dst, src, len)
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char *dst, *src;
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int len;
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{
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while (len-- && !mem_err)
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set_char (dst++, *src++);
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return mem_err;
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}
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union inst
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{
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LONG l;
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struct
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{
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union
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{
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struct /* Unconditional branch */
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{
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unsigned opcode : 6; /* 18 */
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signed li : 24;
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unsigned aa : 1;
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unsigned lk : 1;
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} b;
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struct /* Conditional branch */
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{
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unsigned opcode : 6; /* 16 */
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unsigned bo : 5;
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unsigned bi : 5;
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signed bd : 14;
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unsigned aa : 1;
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unsigned lk : 1;
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} bc;
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struct /* Conditional branch to ctr or lr reg */
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{
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unsigned opcode : 6; /* 19 */
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unsigned bo : 5;
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unsigned bi : 5;
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unsigned type : 15; /* 528 = ctr, 16 = lr */
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unsigned lk : 1;
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} bclr;
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} variant;
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} inst;
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};
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static LONG saved_inst;
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static LONG *saved_inst_pc = 0;
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static LONG saved_target_inst;
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static LONG *saved_target_inst_pc = 0;
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void
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set_step_traps (frame)
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struct StackFrame *frame;
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{
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union inst inst;
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LONG *target;
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int opcode;
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int ra, rb;
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LONG *pc = (LONG *)frame->ExceptionPC;
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inst.l = *pc++;
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opcode = inst.inst.variant.b.opcode;
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target = pc;
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switch (opcode)
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{
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case 18: /* Unconditional branch */
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if (inst.inst.variant.b.aa) /* Absolute? */
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target = 0;
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target += inst.inst.variant.b.li;
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break;
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case 16: /* Conditional branch */
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if (!inst.inst.variant.bc.aa) /* Absolute? */
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target = 0;
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target += inst.inst.variant.bc.bd;
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break;
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case 19: /* Cond. branch via ctr or lr reg */
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switch (inst.inst.variant.bclr.type)
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{
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case 528: /* ctr */
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target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR;
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break;
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case 16: /* lr */
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target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR;
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break;
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}
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break;
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}
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saved_inst = *pc;
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mem_write (pc, breakpoint_insn, BREAKPOINT_SIZE);
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saved_inst_pc = pc;
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if (target != pc)
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{
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saved_target_inst = *target;
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mem_write (target, breakpoint_insn, BREAKPOINT_SIZE);
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saved_target_inst_pc = target;
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}
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}
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/* Remove step breakpoints. Returns non-zero if pc was at a step breakpoint,
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zero otherwise. This routine works even if there were no step breakpoints
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set. */
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int
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clear_step_traps (frame)
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struct StackFrame *frame;
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{
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int retcode;
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LONG *pc = (LONG *)frame->ExceptionPC;
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if (saved_inst_pc == pc || saved_target_inst_pc == pc)
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retcode = 1;
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else
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retcode = 0;
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if (saved_inst_pc)
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{
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mem_write (saved_inst_pc, saved_inst, BREAKPOINT_SIZE);
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saved_inst_pc = 0;
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}
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if (saved_target_inst_pc)
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{
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mem_write (saved_target_inst_pc, saved_target_inst, BREAKPOINT_SIZE);
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saved_target_inst_pc = 0;
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}
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return retcode;
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}
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void
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do_status (ptr, frame)
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char *ptr;
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struct StackFrame *frame;
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{
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int sigval;
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sigval = computeSignal (frame->ExceptionNumber);
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sprintf (ptr, "T%02x", sigval);
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ptr += 3;
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sprintf (ptr, "%02x:", PC_REGNUM);
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ptr = mem2hex (&frame->ExceptionPC, ptr + 3, 4, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", SP_REGNUM);
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ptr = mem2hex (&frame->ExceptionState.CsavedRegs[SP_REGNUM], ptr + 3, 4, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", LR_REGNUM);
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ptr = mem2hex (&frame->ExceptionState.CsavedRegs[LR_REGNUM], ptr + 3, 4, 0);
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*ptr++ = ';';
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*ptr = '\000';
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}
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#if 0
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/*
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* strtol : convert a string to long.
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*
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* Andy Wilson, 2-Oct-89.
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*/
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/* FIXME: It'd be nice to configure around these, but the include files are too
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painful. These macros should at least be more portable than hardwired hex
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constants. */
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#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
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#define LONG_MAX ((long)(ULONG_MAX >> 1)) /* 0x7FFFFFFF */
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#define LONG_MIN ((long)(~LONG_MAX)) /* 0x80000000 */
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extern int errno;
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unsigned long strtoul(const char *s, char **ptr, int base);
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long
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strtol(s, ptr, base)
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const char *s; char **ptr; int base;
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{
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int minus=0;
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unsigned long tmp;
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const char *start=s;
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char *eptr;
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if (s==NULL)
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{
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errno = ERANGE;
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if (!ptr)
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*ptr = (char *)start;
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return 0L;
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}
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while (isspace(*s))
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s++;
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if (*s == '-') {
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s++;
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minus = 1;
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}
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else if (*s == '+')
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s++;
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/*
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* let strtoul do the hard work.
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*/
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tmp = strtoul(s, &eptr, base);
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if (ptr != NULL)
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*ptr = (char *)((eptr==s) ? (char *)start : eptr);
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if (tmp > (minus ? - (unsigned long) LONG_MIN : (unsigned long) LONG_MAX))
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{
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errno = ERANGE;
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return (minus ? LONG_MIN : LONG_MAX);
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}
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return (minus ? (long) -tmp : (long) tmp);
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}
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/*
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* strtol : convert a string to long.
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*
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* Andy Wilson, 2-Oct-89.
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*/
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#ifndef ULONG_MAX
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#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
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#endif
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extern int errno;
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unsigned long
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strtoul(s, ptr, base)
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const char *s; char **ptr; int base;
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{
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unsigned long total = 0;
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unsigned digit;
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const char *start=s;
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int did_conversion=0;
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int overflow = 0;
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int negate = 0;
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unsigned long maxdiv, maxrem;
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if (s==NULL)
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{
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errno = ERANGE;
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if (!ptr)
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*ptr = (char *)start;
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return 0L;
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}
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while (isspace(*s))
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s++;
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if (*s == '+')
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s++;
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else if (*s == '-')
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s++, negate = 1;
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if (base==0 || base==16) /* the 'base==16' is for handling 0x */
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{
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int tmp;
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/*
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* try to infer base from the string
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*/
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if (*s != '0')
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tmp = 10; /* doesn't start with 0 - assume decimal */
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else if (s[1] == 'X' || s[1] == 'x')
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tmp = 16, s += 2; /* starts with 0x or 0X - hence hex */
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else
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tmp = 8; /* starts with 0 - hence octal */
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if (base==0)
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base = (int)tmp;
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}
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maxdiv = ULONG_MAX / base;
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maxrem = ULONG_MAX % base;
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while ((digit = *s) != '\0')
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{
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if (digit >= '0' && digit < ('0'+base))
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digit -= '0';
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else
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if (base > 10)
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{
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if (digit >= 'a' && digit < ('a'+(base-10)))
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digit = digit - 'a' + 10;
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else if (digit >= 'A' && digit < ('A'+(base-10)))
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digit = digit - 'A' + 10;
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else
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break;
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}
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else
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break;
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did_conversion = 1;
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if (total > maxdiv
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|| (total == maxdiv && digit > maxrem))
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overflow = 1;
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total = (total * base) + digit;
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s++;
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}
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if (overflow)
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{
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errno = ERANGE;
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if (ptr != NULL)
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*ptr = (char *)s;
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return (ULONG_MAX);
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}
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if (ptr != NULL)
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*ptr = (char *) ((did_conversion) ? (char *)s : (char *)start);
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return negate ? -total : total;
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}
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#endif
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void _exit (int foo) __attribute__ ((noreturn));
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void
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exit (int foo)
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{
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_exit (foo);
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}
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