326 lines
6.7 KiB
C
326 lines
6.7 KiB
C
#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 <errno.h>
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#include <nwtypes.h>
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#include <nwdfs.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 <nwthread.h>
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#include <aio.h>
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#include "alpha.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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/* 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->ExceptionPC, ®s[PC_REGNUM * 8 * 2], 8 * 1, 0);
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mem2hex (&frame->ExceptionRegs[SF_IREG_OFFSET], ®s[V0_REGNUM * 8 * 2], 8 * 64, 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[PC_REGNUM * 8 * 2], &frame->ExceptionPC, 8 * 1, 0);
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hex2mem (®s[V0_REGNUM * 8 * 2], &frame->ExceptionRegs[SF_IREG_OFFSET], 8 * 64, 0);
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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
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{
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unsigned hint : 16;
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unsigned rb : 5;
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unsigned ra : 5;
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unsigned opcode : 6;
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} jump;
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struct
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{
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signed disp : 21;
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unsigned ra : 5;
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unsigned opcode : 6;
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} branch;
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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.branch.opcode;
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if ((opcode & 0x30) == 0x30) /* A branch of some sort */
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target = inst.inst.variant.branch.disp + pc;
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else if (opcode == 0x1a) /* jmp, ret, etc... */
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target = (LONG *)(frame->ExceptionRegs[SF_IREG_OFFSET
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+ inst.inst.variant.jump.rb].lo
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& ~3);
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else
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target = pc;
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saved_inst = *pc;
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*pc = 0x80; /* call_pal bpt */
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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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*target = 0x80; /* call_pal bpt */
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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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*saved_inst_pc = saved_inst;
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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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*saved_target_inst_pc = saved_target_inst;
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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, 8, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", SP_REGNUM);
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ptr = mem2hex (&frame->ExceptionRegs[SF_IREG_OFFSET + SP_REGNUM], ptr + 3, 8, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", RA_REGNUM);
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ptr = mem2hex (&frame->ExceptionRegs[SF_IREG_OFFSET + RA_REGNUM], ptr + 3, 8, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", FP_REGNUM);
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ptr = mem2hex (&frame->ExceptionRegs[SF_IREG_OFFSET + FP_REGNUM], ptr + 3, 8, 0);
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*ptr++ = ';';
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*ptr = '\000';
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}
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/* This section provides stubs and equivalent interfaces for all functions that
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the debugger stub needs, but aren't yet implemented (such as the AIO nlm). */
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#include <nwtypes.h>
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#include <errno.h>
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#include <stdio.h>
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#include <aio.h>
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#define CONST const
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#define com1Rbr 0x3f8 /* Receiver Buffer - Read */
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#define com1Thr 0x3f8 /* Transmitter Holding - Write */
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#define com1Ier 0x3f9 /* Interrupt Enable */
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#define com1Iir 0x3fa /* Interrupt Identification */
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#define com1Lcr 0x3fb /* Line Control */
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#define com1Mcr 0x3fc /* Modem Control */
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#define com1Lsr 0x3fd /* Line Status */
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#define com1Msr 0x3fe /* Modem Status */
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#define com1Scr 0x3ff /* Scratch */
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#define com1Dll 0x3f8 /* Divisor Latch - lsb */
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#define com1Dlm 0x3f9 /* Divisor Latch - msb */
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#define com2Rbr 0x2f8 /* Receiver Buffer - Read */
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#define com2Thr 0x2f8 /* Transmitter Holding - Write */
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#define com2Ier 0x2f9 /* Interrupt Enable */
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#define com2Iir 0x2fa /* Interrupt Identification */
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#define com2Lcr 0x2fb /* Line Control */
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#define com2Mcr 0x2fc /* Modem Control */
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#define com2Lsr 0x2fd /* Line Status */
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#define com2Msr 0x2fe /* Modem Status */
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#define com2Scr 0x2ff /* Scratch */
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#define com2Dll 0x2f8 /* Divisor Latch - lsb */
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#define com2Dlm 0x2f9 /* Divisor Latch - msb */
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#define COM1 0x8000
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#define COM2 0x9000
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static ULONG
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uart_getchar (void)
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{
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while ((inVti(com1Lsr) & 1) == 0);
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return inVti (com1Rbr);
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}
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static void
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uart_putchar (char c)
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{
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while ((inVti(com1Lsr) & 0x20) == 0);
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outVti (com1Thr,c);
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}
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static int
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uart_init (int baud)
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{
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int i;
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int baudconst;
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baudconst = 115200 / baud;
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outVti (com1Lcr, 0x87);
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outVti (com1Dlm, 0);
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outVti (com1Dll, baudconst);
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outVti (com1Lcr, 0x07);
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outVti (com1Mcr, 0x0F);
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outVti (com1Ier, 0x0);
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}
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int
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AIOReadData (int portHandle, char *buffer, LONG length, LONG *numberBytesRead)
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{
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ULONG c;
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while (1)
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{
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c = uart_getchar ();
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if ((c & ~0377) == COM1)
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break;
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}
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*buffer = c;
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*numberBytesRead = 1;
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return AIO_SUCCESS;
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}
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int
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AIOWriteData (int portHandle, char *buffer, LONG length,
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LONG *numberBytesWritten)
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{
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*numberBytesWritten = length;
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while (length-- > 0)
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uart_putchar (*buffer++);
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return AIO_SUCCESS;
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}
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int
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AIOAcquirePort (int *hardwareType, int *boardNumber, int *portNumber,
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int *portHandle)
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{
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return AIO_SUCCESS;
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}
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int
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AIOConfigurePort (int portHandle, BYTE bitRate, BYTE dataBits, BYTE stopBits,
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BYTE parityMode, BYTE flowCtrlMode)
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{
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uart_init (9600);
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return AIO_SUCCESS;
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}
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int
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AIOGetPortConfiguration (int portHandle, AIOPORTCONFIG *pPortConfig,
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AIODVRCONFIG *pDvrConfig)
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{
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fprintf (stderr, "AIOGetPortConfiguration stubbed out\n");
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exit (1);
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}
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int
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AIOReleasePort (int portHandle)
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{
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return AIO_SUCCESS;
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}
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int
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AIOSetExternalControl (int portHandle, int requestType, int requestValue)
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{
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return AIO_SUCCESS;
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}
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int
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AIOGetExternalStatus (int portHandle, LONG *extStatus, LONG *chgdExtStatus)
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{
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fprintf (stderr, "AIOGetExternalStatus stubbed out\n");
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exit (1);
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}
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void
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StopBell ()
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{
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}
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int
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Breakpoint (int __arg)
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{
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fprintf (stderr, "Breakpoint() stubbed out\n");
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exit (1);
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}
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