| 1 | #include <stdio.h> |
| 2 | #include <string.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <time.h> |
| 5 | #include <errno.h> |
| 6 | |
| 7 | #include <nwtypes.h> |
| 8 | #include <nwdfs.h> |
| 9 | #include <nwconio.h> |
| 10 | #include <nwadv.h> |
| 11 | #include <nwdbgapi.h> |
| 12 | #include <nwthread.h> |
| 13 | #include "ppc.h" |
| 14 | |
| 15 | extern char *mem2hex (void *mem, char *buf, int count, int may_fault); |
| 16 | extern char *hex2mem (char *buf, void *mem, int count, int may_fault); |
| 17 | extern int computeSignal (int exceptionVector); |
| 18 | |
| 19 | void |
| 20 | flush_i_cache (void) |
| 21 | { |
| 22 | } |
| 23 | |
| 24 | /* Get the registers out of the frame information. */ |
| 25 | |
| 26 | void |
| 27 | frame_to_registers (struct StackFrame *frame, char *regs) |
| 28 | { |
| 29 | mem2hex (&frame->ExceptionState.CsavedRegs, ®s[GP0_REGNUM * 4 * 2], 4 * 32, 0); |
| 30 | |
| 31 | mem2hex (&frame->ExceptionState.CSavedFPRegs, ®s[FP0_REGNUM * 4 * 2], 4 * 32, 0); |
| 32 | |
| 33 | mem2hex (&frame->ExceptionPC, ®s[PC_REGNUM * 4 * 2], 4 * 1, 0); |
| 34 | |
| 35 | mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, ®s[CR_REGNUM * 4 * 2], 4 * 1, 0); |
| 36 | mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, ®s[LR_REGNUM * 4 * 2], 4 * 1, 0); |
| 37 | mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, ®s[CTR_REGNUM * 4 * 2], 4 * 1, 0); |
| 38 | mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, ®s[XER_REGNUM * 4 * 2], 4 * 1, 0); |
| 39 | mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, ®s[MQ_REGNUM * 4 * 2], 4 * 1, 0); |
| 40 | } |
| 41 | |
| 42 | /* Put the registers back into the frame information. */ |
| 43 | |
| 44 | void |
| 45 | registers_to_frame (char *regs, struct StackFrame *frame) |
| 46 | { |
| 47 | hex2mem (®s[GP0_REGNUM * 4 * 2], &frame->ExceptionState.CsavedRegs, 4 * 32, 0); |
| 48 | |
| 49 | hex2mem (®s[FP0_REGNUM * 4 * 2], &frame->ExceptionState.CSavedFPRegs, 4 * 32, 0); |
| 50 | |
| 51 | hex2mem (®s[PC_REGNUM * 4 * 2], &frame->ExceptionPC, 4 * 1, 0); |
| 52 | |
| 53 | hex2mem (®s[CR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, 4 * 1, 0); |
| 54 | hex2mem (®s[LR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, 4 * 1, 0); |
| 55 | hex2mem (®s[CTR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, 4 * 1, 0); |
| 56 | hex2mem (®s[XER_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, 4 * 1, 0); |
| 57 | hex2mem (®s[MQ_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, 4 * 1, 0); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | extern volatile int mem_err; |
| 62 | |
| 63 | #ifdef ALTERNATE_MEM_FUNCS |
| 64 | extern int ReadByteAltDebugger (char* addr, char *theByte); |
| 65 | extern int WriteByteAltDebugger (char* addr, char theByte); |
| 66 | int |
| 67 | get_char (char *addr) |
| 68 | { |
| 69 | char c; |
| 70 | |
| 71 | if (!ReadByteAltDebugger (addr, &c)) |
| 72 | mem_err = 1; |
| 73 | |
| 74 | return c; |
| 75 | } |
| 76 | |
| 77 | void |
| 78 | set_char (char *addr, int val) |
| 79 | { |
| 80 | if (!WriteByteAltDebugger (addr, val)) |
| 81 | mem_err = 1; |
| 82 | } |
| 83 | #endif |
| 84 | |
| 85 | int |
| 86 | mem_write (char *dst, char *src, int len) |
| 87 | { |
| 88 | while (len-- && !mem_err) |
| 89 | set_char (dst++, *src++); |
| 90 | |
| 91 | return mem_err; |
| 92 | } |
| 93 | |
| 94 | union inst |
| 95 | { |
| 96 | LONG l; |
| 97 | |
| 98 | struct |
| 99 | { |
| 100 | union |
| 101 | { |
| 102 | struct /* Unconditional branch */ |
| 103 | { |
| 104 | unsigned opcode : 6; /* 18 */ |
| 105 | signed li : 24; |
| 106 | unsigned aa : 1; |
| 107 | unsigned lk : 1; |
| 108 | } b; |
| 109 | struct /* Conditional branch */ |
| 110 | { |
| 111 | unsigned opcode : 6; /* 16 */ |
| 112 | unsigned bo : 5; |
| 113 | unsigned bi : 5; |
| 114 | signed bd : 14; |
| 115 | unsigned aa : 1; |
| 116 | unsigned lk : 1; |
| 117 | } bc; |
| 118 | struct /* Conditional branch to ctr or lr reg */ |
| 119 | { |
| 120 | unsigned opcode : 6; /* 19 */ |
| 121 | unsigned bo : 5; |
| 122 | unsigned bi : 5; |
| 123 | unsigned type : 15; /* 528 = ctr, 16 = lr */ |
| 124 | unsigned lk : 1; |
| 125 | } bclr; |
| 126 | } variant; |
| 127 | } inst; |
| 128 | }; |
| 129 | |
| 130 | static LONG saved_inst; |
| 131 | static LONG *saved_inst_pc = 0; |
| 132 | static LONG saved_target_inst; |
| 133 | static LONG *saved_target_inst_pc = 0; |
| 134 | |
| 135 | void |
| 136 | set_step_traps (struct StackFrame *frame) |
| 137 | { |
| 138 | union inst inst; |
| 139 | LONG *target; |
| 140 | int opcode; |
| 141 | int ra, rb; |
| 142 | LONG *pc = (LONG *)frame->ExceptionPC; |
| 143 | |
| 144 | inst.l = *pc++; |
| 145 | |
| 146 | opcode = inst.inst.variant.b.opcode; |
| 147 | |
| 148 | target = pc; |
| 149 | |
| 150 | switch (opcode) |
| 151 | { |
| 152 | case 18: /* Unconditional branch */ |
| 153 | |
| 154 | if (inst.inst.variant.b.aa) /* Absolute? */ |
| 155 | target = 0; |
| 156 | target += inst.inst.variant.b.li; |
| 157 | |
| 158 | break; |
| 159 | case 16: /* Conditional branch */ |
| 160 | |
| 161 | if (!inst.inst.variant.bc.aa) /* Absolute? */ |
| 162 | target = 0; |
| 163 | target += inst.inst.variant.bc.bd; |
| 164 | |
| 165 | break; |
| 166 | case 19: /* Cond. branch via ctr or lr reg */ |
| 167 | switch (inst.inst.variant.bclr.type) |
| 168 | { |
| 169 | case 528: /* ctr */ |
| 170 | target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR; |
| 171 | break; |
| 172 | case 16: /* lr */ |
| 173 | target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR; |
| 174 | break; |
| 175 | } |
| 176 | break; |
| 177 | } |
| 178 | |
| 179 | saved_inst = *pc; |
| 180 | mem_write (pc, breakpoint_insn, BREAKPOINT_SIZE); |
| 181 | saved_inst_pc = pc; |
| 182 | |
| 183 | if (target != pc) |
| 184 | { |
| 185 | saved_target_inst = *target; |
| 186 | mem_write (target, breakpoint_insn, BREAKPOINT_SIZE); |
| 187 | saved_target_inst_pc = target; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | /* Remove step breakpoints. Returns non-zero if pc was at a step breakpoint, |
| 192 | zero otherwise. This routine works even if there were no step breakpoints |
| 193 | set. */ |
| 194 | |
| 195 | int |
| 196 | clear_step_traps (struct StackFrame *frame) |
| 197 | { |
| 198 | int retcode; |
| 199 | LONG *pc = (LONG *)frame->ExceptionPC; |
| 200 | |
| 201 | if (saved_inst_pc == pc || saved_target_inst_pc == pc) |
| 202 | retcode = 1; |
| 203 | else |
| 204 | retcode = 0; |
| 205 | |
| 206 | if (saved_inst_pc) |
| 207 | { |
| 208 | mem_write (saved_inst_pc, saved_inst, BREAKPOINT_SIZE); |
| 209 | saved_inst_pc = 0; |
| 210 | } |
| 211 | |
| 212 | if (saved_target_inst_pc) |
| 213 | { |
| 214 | mem_write (saved_target_inst_pc, saved_target_inst, BREAKPOINT_SIZE); |
| 215 | saved_target_inst_pc = 0; |
| 216 | } |
| 217 | |
| 218 | return retcode; |
| 219 | } |
| 220 | |
| 221 | void |
| 222 | do_status (char *ptr, struct StackFrame *frame) |
| 223 | { |
| 224 | int sigval; |
| 225 | |
| 226 | sigval = computeSignal (frame->ExceptionNumber); |
| 227 | |
| 228 | sprintf (ptr, "T%02x", sigval); |
| 229 | ptr += 3; |
| 230 | |
| 231 | sprintf (ptr, "%02x:", PC_REGNUM); |
| 232 | ptr = mem2hex (&frame->ExceptionPC, ptr + 3, 4, 0); |
| 233 | *ptr++ = ';'; |
| 234 | |
| 235 | sprintf (ptr, "%02x:", SP_REGNUM); |
| 236 | ptr = mem2hex (&frame->ExceptionState.CsavedRegs[SP_REGNUM], ptr + 3, 4, 0); |
| 237 | *ptr++ = ';'; |
| 238 | |
| 239 | sprintf (ptr, "%02x:", LR_REGNUM); |
| 240 | ptr = mem2hex (&frame->ExceptionState.CsavedRegs[LR_REGNUM], ptr + 3, 4, 0); |
| 241 | *ptr++ = ';'; |
| 242 | |
| 243 | *ptr = '\000'; |
| 244 | } |