diff --git a/gdb/sparcl-stub.c b/gdb/sparcl-stub.c new file mode 100644 index 0000000000..3d60186eef --- /dev/null +++ b/gdb/sparcl-stub.c @@ -0,0 +1,984 @@ +/**************************************************************************** + + THIS SOFTWARE IS NOT COPYRIGHTED + + HP offers the following for use in the public domain. HP makes no + warranty with regard to the software or it's performance and the + user accepts the software "AS IS" with all faults. + + HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD + TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES + OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + +****************************************************************************/ + +/**************************************************************************** + * Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $ + * + * Module name: remcom.c $ + * Revision: 1.34 $ + * Date: 91/03/09 12:29:49 $ + * Contributor: Lake Stevens Instrument Division$ + * + * Description: low level support for gdb debugger. $ + * + * Considerations: only works on target hardware $ + * + * Written by: Glenn Engel $ + * ModuleState: Experimental $ + * + * NOTES: See Below $ + * + * Modified for SPARC by Stu Grossman, Cygnus Support. + * Based on sparc-stub.c, it's modified for SPARClite Debug Unit hardware + * breakpoint support to create sparclite-stub.c, by Kung Hsu, Cygnus Support. + * + * This code has been extensively tested on the Fujitsu SPARClite demo board. + * + * To enable debugger support, two things need to happen. One, a + * call to set_debug_traps() is necessary in order to allow any breakpoints + * or error conditions to be properly intercepted and reported to gdb. + * Two, a breakpoint needs to be generated to begin communication. This + * is most easily accomplished by a call to breakpoint(). Breakpoint() + * simulates a breakpoint by executing a trap #1. + * + ************* + * + * The following gdb commands are supported: + * + * command function Return value + * + * g return the value of the CPU registers hex data or ENN + * G set the value of the CPU registers OK or ENN + * + * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN + * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN + * + * c Resume at current address SNN ( signal NN) + * cAA..AA Continue at address AA..AA SNN + * + * s Step one instruction SNN + * sAA..AA Step one instruction from AA..AA SNN + * + * k kill + * + * ? What was the last sigval ? SNN (signal NN) + * + * bBB..BB Set baud rate to BB..BB OK or BNN, then sets + * baud rate + * + * All commands and responses are sent with a packet which includes a + * checksum. A packet consists of + * + * $#. + * + * where + * :: + * :: < two hex digits computed as modulo 256 sum of > + * + * When a packet is received, it is first acknowledged with either '+' or '-'. + * '+' indicates a successful transfer. '-' indicates a failed transfer. + * + * Example: + * + * Host: Reply: + * $m0,10#2a +$00010203040506070809101112131415#42 + * + ****************************************************************************/ + +#include "defs.h" +#include +#include + +/************************************************************************ + * + * external low-level support routines + */ + +extern putDebugChar(); /* write a single character */ +extern getDebugChar(); /* read and return a single char */ + +/************************************************************************/ +/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/ +/* at least NUMREGBYTES*2 are needed for register packets */ +#define BUFMAX 2048 + +static int initialized = 0; /* !0 means we've been initialized */ + +extern void breakinst(); +static void hw_breakpoint(); +static void set_mem_fault_trap(); +static void get_in_break_mode(); + +static const char hexchars[]="0123456789abcdef"; + +#define NUMREGS 80 + +/* Number of bytes of registers. */ +#define NUMREGBYTES (NUMREGS * 4) +enum regnames {G0, G1, G2, G3, G4, G5, G6, G7, + O0, O1, O2, O3, O4, O5, SP, O7, + L0, L1, L2, L3, L4, L5, L6, L7, + I0, I1, I2, I3, I4, I5, FP, I7, + + F0, F1, F2, F3, F4, F5, F6, F7, + F8, F9, F10, F11, F12, F13, F14, F15, + F16, F17, F18, F19, F20, F21, F22, F23, + F24, F25, F26, F27, F28, F29, F30, F31, + Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR, + DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR }; + +/*************************** ASSEMBLY CODE MACROS *************************/ +/* */ + +extern void trap_low(); + +asm(" + .reserve trapstack, 1000 * 4, \"bss\", 8 + + .data + .align 4 + +in_trap_handler: + .word 0 + + .text + .align 4 + +! This function is called when any SPARC trap (except window overflow or +! underflow) occurs. It makes sure that the invalid register window is still +! available before jumping into C code. It will also restore the world if you +! return from handle_exception. + + .globl _trap_low +_trap_low: + mov %psr, %l0 + mov %wim, %l3 + + srl %l3, %l0, %l4 ! wim >> cwp + cmp %l4, 1 + bne window_fine ! Branch if not in the invalid window + nop + +! Handle window overflow + + mov %g1, %l4 ! Save g1, we use it to hold the wim + srl %l3, 1, %g1 ! Rotate wim right + tst %g1 + bg good_wim ! Branch if new wim is non-zero + +! At this point, we need to bring a 1 into the high order bit of the wim. +! Since we don't want to make any assumptions about the number of register +! windows, we figure it out dynamically so as to setup the wim correctly. + + not %g1 ! Fill g1 with ones + mov %g1, %wim ! Fill the wim with ones + nop + nop + nop + mov %wim, %g1 ! Read back the wim + inc %g1 ! Now g1 has 1 just to left of wim + srl %g1, 1, %g1 ! Now put 1 at top of wim + mov %g0, %wim ! Clear wim so that subsequent save + nop ! won't trap + nop + nop + +good_wim: + save %g0, %g0, %g0 ! Slip into next window + mov %g1, %wim ! Install the new wim + + std %l0, [%sp + 0 * 4] ! save L & I registers + std %l2, [%sp + 2 * 4] + std %l4, [%sp + 4 * 4] + std %l6, [%sp + 6 * 4] + + std %i0, [%sp + 8 * 4] + std %i2, [%sp + 10 * 4] + std %i4, [%sp + 12 * 4] + std %i6, [%sp + 14 * 4] + + restore ! Go back to trap window. + mov %l4, %g1 ! Restore %g1 + +window_fine: + sethi %hi(in_trap_handler), %l4 + ld [%lo(in_trap_handler) + %l4], %l5 + tst %l5 + bg recursive_trap + inc %l5 + + set trapstack+1000*4, %sp ! Switch to trap stack + +recursive_trap: + st %l5, [%lo(in_trap_handler) + %l4] + sub %sp,(16+1+6+1+80)*4,%sp ! Make room for input & locals + ! + hidden arg + arg spill + ! + doubleword alignment + ! + registers[72] local var + + std %g0, [%sp + (24 + 0) * 4] ! registers[Gx] + std %g2, [%sp + (24 + 2) * 4] + std %g4, [%sp + (24 + 4) * 4] + std %g6, [%sp + (24 + 6) * 4] + + std %i0, [%sp + (24 + 8) * 4] ! registers[Ox] + std %i2, [%sp + (24 + 10) * 4] + std %i4, [%sp + (24 + 12) * 4] + std %i6, [%sp + (24 + 14) * 4] + ! F0->F31 not implemented + mov %y, %l4 + mov %tbr, %l5 + st %l4, [%sp + (24 + 64) * 4] ! Y + st %l0, [%sp + (24 + 65) * 4] ! PSR + st %l3, [%sp + (24 + 66) * 4] ! WIM + st %l5, [%sp + (24 + 67) * 4] ! TBR + st %l1, [%sp + (24 + 68) * 4] ! PC + st %l2, [%sp + (24 + 69) * 4] ! NPC + ! CPSR and FPSR not impl + or %l0, 0xf20, %l4 + mov %l4, %psr ! Turn on traps, disable interrupts + nop + nop + nop + call _get_in_break_mode + nop + nop + nop + + sethi %hi(0xff00), %l5 + or %l5, %lo(0xff00), %l5 + + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 72) * 4] ! DIA1, debug instr addr 1 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 73) * 4] ! DIA2, debug instr addr 2 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 74) * 4] ! DDA1, debug data addr 1 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 75) * 4] ! DDA2, debug data addr 2 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 76) * 4] ! DDV1, debug data val 1 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 77) * 4] ! DDV2, debug data val 2 + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 78) * 4] ! DCR, debug control reg + add %l5, 4, %l5 + lda [%l5]0x1, %l4 + st %l4, [%sp + (24 + 79) * 4] ! DSR, debug status reg + nop + nop + or %l0, 0xf20, %l4 + mov %l4, %psr ! Turn on traps, disable interrupts + nop + nop + nop + call _handle_exception + add %sp, 24 * 4, %o0 ! Pass address of registers + +! Reload all of the registers that aren't on the stack + + ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx] + ldd [%sp + (24 + 2) * 4], %g2 + ldd [%sp + (24 + 4) * 4], %g4 + ldd [%sp + (24 + 6) * 4], %g6 + + ldd [%sp + (24 + 8) * 4], %i0 ! registers[Ox] + ldd [%sp + (24 + 10) * 4], %i2 + ldd [%sp + (24 + 12) * 4], %i4 + ldd [%sp + (24 + 14) * 4], %i6 + + sethi %hi(0xff00), %l2 + or %l2, %lo(0xff00), %l2 + ldd [%sp + (24 + 72) * 4], %l4 ! DIA1, debug instr addr 1 + stda %l4, [%l2]0x1 + nop + nop + nop + nop + ldd [%sp + (24 + 74) * 4], %l4 ! DDA1, debug data addr 1 + add %l2, 8, %l2 + stda %l4, [%l2]0x1 + nop + nop + nop + nop + ldd [%sp + (24 + 76) * 4], %l4 ! DDV1, debug data value 1 + add %l2, 8, %l2 + stda %l4, [%l2]0x1 + nop + nop + nop + nop + ld [%sp + (24 + 78) * 4], %l4 ! DCR, debug control reg + ld [%sp + (24 + 79) * 4], %l5 ! DSR, debug control reg + add %l2, 8, %l2 + or %l4, 0x200, %l4 + sta %l4, [%l2]0x1 + add %l2, 4, %l2 + sta %l5, [%l2]0x1 + nop + nop + nop + nop + + ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR + ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC + + restore ! Ensure that previous window is valid + save %g0, %g0, %g0 ! by causing a window_underflow trap + + mov %l0, %y + mov %l1, %psr ! Make sure that traps are disabled + ! for rett + sethi %hi(in_trap_handler), %l4 + ld [%lo(in_trap_handler) + %l4], %l5 + dec %l5 + st %l5, [%lo(in_trap_handler) + %l4] + + jmpl %l2, %g0 ! Restore old PC + rett %l3 ! Restore old nPC +"); + +/* Convert ch from a hex digit to an int */ + +static int +hex(ch) + unsigned char ch; +{ + if (ch >= 'a' && ch <= 'f') + return ch-'a'+10; + if (ch >= '0' && ch <= '9') + return ch-'0'; + if (ch >= 'A' && ch <= 'F') + return ch-'A'+10; + return -1; +} + +/* scan for the sequence $# */ + +static void +getpacket(buffer) + char *buffer; +{ + unsigned char checksum; + unsigned char xmitcsum; + int i; + int count; + unsigned char ch; + + do + { + /* wait around for the start character, ignore all other characters */ + while ((ch = getDebugChar()) != '$') ; + + checksum = 0; + xmitcsum = -1; + + count = 0; + + /* now, read until a # or end of buffer is found */ + while (count < BUFMAX) + { + ch = getDebugChar(); + if (ch == '#') + break; + checksum = checksum + ch; + buffer[count] = ch; + count = count + 1; + } + + if (count >= BUFMAX) + continue; + + buffer[count] = 0; + + if (ch == '#') + { + xmitcsum = hex(getDebugChar()) << 4; + xmitcsum |= hex(getDebugChar()); +#if 0 + /* Humans shouldn't have to figure out checksums to type to it. */ + putDebugChar ('+'); + return; +#endif + if (checksum != xmitcsum) + putDebugChar('-'); /* failed checksum */ + else + { + putDebugChar('+'); /* successful transfer */ + /* if a sequence char is present, reply the sequence ID */ + if (buffer[2] == ':') + { + putDebugChar(buffer[0]); + putDebugChar(buffer[1]); + /* remove sequence chars from buffer */ + count = strlen(buffer); + for (i=3; i <= count; i++) + buffer[i-3] = buffer[i]; + } + } + } + } + while (checksum != xmitcsum); +} + +/* send the packet in buffer. */ + +static void +putpacket(buffer) + unsigned char *buffer; +{ + unsigned char checksum; + int count; + unsigned char ch; + + /* $#. */ + do + { + putDebugChar('$'); + checksum = 0; + count = 0; + + while (ch = buffer[count]) + { + if (! putDebugChar(ch)) + return; + checksum += ch; + count += 1; + } + + putDebugChar('#'); + putDebugChar(hexchars[checksum >> 4]); + putDebugChar(hexchars[checksum & 0xf]); + + } + while (getDebugChar() != '+'); +} + +static char remcomInBuffer[BUFMAX]; +static char remcomOutBuffer[BUFMAX]; + +/* Indicate to caller of mem2hex or hex2mem that there has been an + error. */ +static volatile int mem_err = 0; + +/* Convert the memory pointed to by mem into hex, placing result in buf. + * Return a pointer to the last char put in buf (null), in case of mem fault, + * return 0. + * If MAY_FAULT is non-zero, then we will handle memory faults by returning + * a 0, else treat a fault like any other fault in the stub. + */ + +static unsigned char * +mem2hex(mem, buf, count, may_fault) + unsigned char *mem; + unsigned char *buf; + int count; + int may_fault; +{ + unsigned char ch; + + set_mem_fault_trap(may_fault); + + while (count-- > 0) + { + ch = *mem++; + if (mem_err) + return 0; + *buf++ = hexchars[ch >> 4]; + *buf++ = hexchars[ch & 0xf]; + } + + *buf = 0; + + set_mem_fault_trap(0); + + return buf; +} + +/* convert the hex array pointed to by buf into binary to be placed in mem + * return a pointer to the character AFTER the last byte written */ + +static char * +hex2mem(buf, mem, count, may_fault) + unsigned char *buf; + unsigned char *mem; + int count; + int may_fault; +{ + int i; + unsigned char ch; + + set_mem_fault_trap(may_fault); + + for (i=0; itt && ht->signo; ht++) + exceptionHandler(ht->tt, trap_low); + + /* In case GDB is started before us, ack any packets (presumably + "$?#xx") sitting there. */ + + putDebugChar ('+'); + + initialized = 1; +} + +asm (" +! Trap handler for memory errors. This just sets mem_err to be non-zero. It +! assumes that %l1 is non-zero. This should be safe, as it is doubtful that +! 0 would ever contain code that could mem fault. This routine will skip +! past the faulting instruction after setting mem_err. + + .text + .align 4 + +_fltr_set_mem_err: + sethi %hi(_mem_err), %l0 + st %l1, [%l0 + %lo(_mem_err)] + jmpl %l2, %g0 + rett %l2+4 +"); + +static void +set_mem_fault_trap(enable) + int enable; +{ + extern void fltr_set_mem_err(); + mem_err = 0; + + if (enable) + exceptionHandler(9, fltr_set_mem_err); + else + exceptionHandler(9, trap_low); +} + +asm (" + .text + .align 4 + +_dummy_hw_breakpoint: + jmpl %l2, %g0 + rett %l2+4 + nop + nop +"); + +static void +set_hw_breakpoint_trap(enable) + int enable; +{ + extern void dummy_hw_breakpoint(); + + if (enable) + exceptionHandler(255, dummy_hw_breakpoint); + else + exceptionHandler(255, trap_low); +} + +static void +get_in_break_mode() +{ + set_hw_breakpoint_trap(1); + + asm(" + sethi %hi(0xff10), %l4 + or %l4, %lo(0xff10), %l4 + sta %g0, [%l4]0x1 + nop + nop + nop + "); + + set_hw_breakpoint_trap(0); +} + +/* Convert the SPARC hardware trap type code to a unix signal number. */ + +static int +computeSignal(tt) + int tt; +{ + struct hard_trap_info *ht; + + for (ht = hard_trap_info; ht->tt && ht->signo; ht++) + if (ht->tt == tt) + return ht->signo; + + return SIGHUP; /* default for things we don't know about */ +} + +/* + * While we find nice hex chars, build an int. + * Return number of chars processed. + */ + +static int +hexToInt(char **ptr, int *intValue) +{ + int numChars = 0; + int hexValue; + + *intValue = 0; + + while (**ptr) + { + hexValue = hex(**ptr); + if (hexValue < 0) + break; + + *intValue = (*intValue << 4) | hexValue; + numChars ++; + + (*ptr)++; + } + + return (numChars); +} + +/* + * This function does all command procesing for interfacing to gdb. It + * returns 1 if you should skip the instruction at the trap address, 0 + * otherwise. + */ + + +static void +handle_exception (registers) + unsigned long *registers; +{ + int tt; /* Trap type */ + int sigval; + int addr; + int length; + char *ptr; + unsigned long *sp; + unsigned long dsr; + +/* First, we must force all of the windows to be spilled out */ + + asm(" save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + save %sp, -64, %sp + restore + restore + restore + restore + restore + restore + restore + restore +"); + + if (registers[PC] == (unsigned long)breakinst) + { + registers[PC] = registers[NPC]; + registers[NPC] += 4; + } + sp = (unsigned long *)registers[SP]; + + dsr = (unsigned long)registers[DSR]; + if (dsr & 0x3c) + { + tt = 255; + } + else + { + tt = (registers[TBR] >> 4) & 0xff; + } + + /* reply to host that an exception has occurred */ + sigval = computeSignal(tt); + ptr = remcomOutBuffer; + + *ptr++ = 'T'; + *ptr++ = hexchars[sigval >> 4]; + *ptr++ = hexchars[sigval & 0xf]; + + *ptr++ = hexchars[PC >> 4]; + *ptr++ = hexchars[PC & 0xf]; + *ptr++ = ':'; + ptr = mem2hex((char *)®isters[PC], ptr, 4, 0); + *ptr++ = ';'; + + *ptr++ = hexchars[FP >> 4]; + *ptr++ = hexchars[FP & 0xf]; + *ptr++ = ':'; + ptr = mem2hex(sp + 8 + 6, ptr, 4, 0); /* FP */ + *ptr++ = ';'; + + *ptr++ = hexchars[SP >> 4]; + *ptr++ = hexchars[SP & 0xf]; + *ptr++ = ':'; + ptr = mem2hex((char *)&sp, ptr, 4, 0); + *ptr++ = ';'; + + *ptr++ = hexchars[NPC >> 4]; + *ptr++ = hexchars[NPC & 0xf]; + *ptr++ = ':'; + ptr = mem2hex((char *)®isters[NPC], ptr, 4, 0); + *ptr++ = ';'; + + *ptr++ = hexchars[O7 >> 4]; + *ptr++ = hexchars[O7 & 0xf]; + *ptr++ = ':'; + ptr = mem2hex((char *)®isters[O7], ptr, 4, 0); + *ptr++ = ';'; + + *ptr++ = 0; + + putpacket(remcomOutBuffer); + + while (1) + { + remcomOutBuffer[0] = 0; + + getpacket(remcomInBuffer); + switch (remcomInBuffer[0]) + { + case '?': + remcomOutBuffer[0] = 'S'; + remcomOutBuffer[1] = hexchars[sigval >> 4]; + remcomOutBuffer[2] = hexchars[sigval & 0xf]; + remcomOutBuffer[3] = 0; + break; + + case 'd': + /* toggle debug flag */ + break; + + case 'g': /* return the value of the CPU registers */ + { + ptr = remcomOutBuffer; + ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */ + ptr = mem2hex(sp + 0, ptr, 16 * 4, 0); /* L & I regs */ + memset(ptr, '0', 32 * 8); /* Floating point */ + ptr = mem2hex((char *)®isters[Y], + ptr + 32 * 4 * 2, + 8 * 4, + 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ + mem2hex((char *)®isters[DIA1], ptr, + 8 * 4, 0); /* DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR */ + } + break; + + case 'G': /* set the value of the CPU registers - return OK */ + { + unsigned long *newsp, psr; + + psr = registers[PSR]; + + ptr = &remcomInBuffer[1]; + hex2mem(ptr, (char *)registers, 16 * 4, 0); /* G & O regs */ + hex2mem(ptr + 16 * 4 * 2, sp + 0, 16 * 4, 0); /* L & I regs */ + hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y], + 8 * 4, 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ + hex2mem(ptr + 72 * 4 * 2, (char *)®isters[DIA1], + 8 * 4, 0); /* DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR */ + + /* See if the stack pointer has moved. If so, then copy the saved + locals and ins to the new location. This keeps the window + overflow and underflow routines happy. */ + + newsp = (unsigned long *)registers[SP]; + if (sp != newsp) + sp = memcpy(newsp, sp, 16 * 4); + + /* Don't allow CWP to be modified. */ + + if (psr != registers[PSR]) + registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f); + + strcpy(remcomOutBuffer,"OK"); + } + break; + + case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ + /* Try to read %x,%x. */ + + ptr = &remcomInBuffer[1]; + + if (hexToInt(&ptr, &addr) + && *ptr++ == ',' + && hexToInt(&ptr, &length)) + { + if (mem2hex((char *)addr, remcomOutBuffer, length, 1)) + break; + + strcpy (remcomOutBuffer, "E03"); + } + else + strcpy(remcomOutBuffer,"E01"); + break; + + case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ + /* Try to read '%x,%x:'. */ + + ptr = &remcomInBuffer[1]; + + if (hexToInt(&ptr, &addr) + && *ptr++ == ',' + && hexToInt(&ptr, &length) + && *ptr++ == ':') + { + if (hex2mem(ptr, (char *)addr, length, 1)) + strcpy(remcomOutBuffer, "OK"); + else + strcpy(remcomOutBuffer, "E03"); + } + else + strcpy(remcomOutBuffer, "E02"); + break; + + case 'c': /* cAA..AA Continue at address AA..AA(optional) */ + /* try to read optional parameter, pc unchanged if no parm */ + + ptr = &remcomInBuffer[1]; + if (hexToInt(&ptr, &addr)) + { + registers[PC] = addr; + registers[NPC] = addr + 4; + } + +/* Need to flush the instruction cache here, as we may have deposited a + breakpoint, and the icache probably has no way of knowing that a data ref to + some location may have changed something that is in the instruction cache. + */ + + flush_i_cache(); + return; + + /* kill the program */ + case 'k' : /* do nothing */ + break; +#if 0 + case 't': /* Test feature */ + asm (" std %f30,[%sp]"); + break; +#endif + case 'r': /* Reset */ + asm ("call 0 + nop "); + break; + +#if 0 +Disabled until we can unscrew this properly + + case 'b': /* bBB... Set baud rate to BB... */ + { + int baudrate; + extern void set_timer_3(); + + ptr = &remcomInBuffer[1]; + if (!hexToInt(&ptr, &baudrate)) + { + strcpy(remcomOutBuffer,"B01"); + break; + } + + /* Convert baud rate to uart clock divider */ + switch (baudrate) + { + case 38400: + baudrate = 16; + break; + case 19200: + baudrate = 33; + break; + case 9600: + baudrate = 65; + break; + default: + strcpy(remcomOutBuffer,"B02"); + goto x1; + } + + putpacket("OK"); /* Ack before changing speed */ + set_timer_3(baudrate); /* Set it */ + } +x1: break; +#endif + } /* switch */ + + /* reply to the request */ + putpacket(remcomOutBuffer); + } +} + +/* This function will generate a breakpoint exception. It is used at the + beginning of a program to sync up with a debugger and can be used + otherwise as a quick means to stop program execution and "break" into + the debugger. */ + +void +breakpoint() +{ + if (!initialized) + return; + + asm(" .globl _breakinst + + _breakinst: ta 1 + "); +} + +static void +hw_breakpoint() +{ + asm(" + ta 127 + "); +} diff --git a/gdb/sparcl-tdep.c b/gdb/sparcl-tdep.c new file mode 100644 index 0000000000..b3af30b8b0 --- /dev/null +++ b/gdb/sparcl-tdep.c @@ -0,0 +1,210 @@ +/* Target-dependent code for the Fujitsu SPARCLITE for GDB, the GNU debugger. + Copyright 1994 Free Software Foundation, Inc. + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "defs.h" +#include "gdbcore.h" +#include "breakpoint.h" + +#define DDA2_SUP_ASI 0xb000000 +#define DDA1_SUP_ASI 0xb0000 + +#define DDA2_ASI_MASK 0xff000000 +#define DDA1_ASI_MASK 0xff0000 +#define DIA2_SUP_MODE 0x8000 +#define DIA1_SUP_MODE 0x4000 +#define DDA2_ENABLE 0x100 +#define DDA1_ENABLE 0x80 +#define DIA2_ENABLE 0x40 +#define DIA1_ENABLE 0x20 +#define DSINGLE_STEP 0x10 +#define DDV_TYPE_MASK 0xc +#define DDV_TYPE_LOAD 0x0 +#define DDV_TYPE_STORE 0x4 +#define DDV_TYPE_ACCESS 0x8 +#define DDV_TYPE_ALWAYS 0xc +#define DDV_COND 0x2 +#define DDV_MASK 0x1 + +int +sparclite_insert_watchpoint(addr, len, type) + CORE_ADDR addr; + int len; + int type; +{ +CORE_ADDR dcr; + + dcr = read_register (DCR_REGNUM); + + if (!(dcr & DDA1_ENABLE)) + { + write_register (DDA1_REGNUM, addr); + dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK); + dcr |= (DDA1_SUP_ASI | DDA1_ENABLE); + if (type == 1) + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK)); + } + else if (type == 0) + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK)); + } + else + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_ACCESS); + } + write_register (DCR_REGNUM, dcr); + } + else if (!(dcr & DDA2_ENABLE)) + { + write_register (DDA2_REGNUM, addr); + dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK); + dcr |= (DDA2_SUP_ASI | DDA2_ENABLE); + if (type == 1) + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK); + } + else if (type == 0) + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK); + } + else + { + write_register (DDV1_REGNUM, 0); + write_register (DDV2_REGNUM, 0xffffffff); + dcr |= (DDV_TYPE_ACCESS); + } + write_register (DCR_REGNUM, dcr); + } + else + return -1; + + return 0; +} + +int +sparclite_remove_watchpoint(addr, len, type) + CORE_ADDR addr; + int len; + int type; +{ +CORE_ADDR dcr, dda1, dda2; + + dcr = read_register (DCR_REGNUM); + dda1 = read_register (DDA1_REGNUM); + dda2 = read_register (DDA2_REGNUM); + + if ((dcr & DDA1_ENABLE) && addr == dda1) { + write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE)); + } + else if ((dcr & DDA2_ENABLE) && addr == dda2) { + write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE)); + } + else + return -1; + + return 0; +} + +int +sparclite_insert_hw_breakpoint(addr, len) + CORE_ADDR addr; + int len; +{ +CORE_ADDR dcr; + + dcr = read_register (DCR_REGNUM); + + if (!(dcr & DIA1_ENABLE)) { + write_register (DIA1_REGNUM, addr); + write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE)); + } + else if (!(dcr & DIA2_ENABLE)) { + write_register (DIA2_REGNUM, addr); + write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE)); + } + else + return -1; + + return 0; +} + +int +sparclite_remove_hw_breakpoint(addr, shadow) + CORE_ADDR addr; + int shadow; +{ +CORE_ADDR dcr, dia1, dia2; + + dcr = read_register (DCR_REGNUM); + dia1 = read_register (DIA1_REGNUM); + dia2 = read_register (DIA2_REGNUM); + + if ((dcr & DIA1_ENABLE) && addr == dia1) { + write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE)); + } + else if ((dcr & DIA2_ENABLE) && addr == dia2) { + write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE)); + } + else + return -1; + + return 0; +} + +int +sparclite_check_watch_resources(type, cnt, ot) + int type; + int cnt; + int ot; +{ + if (type == bp_hardware_breakpoint) { + if (TARGET_HW_BREAK_LIMIT == 0) return 0; + else if (cnt <= TARGET_HW_BREAK_LIMIT) return 1; + } + else { + if (TARGET_HW_WATCH_LIMIT == 0) return 0; + else if (ot) return -1; + else if (cnt <= TARGET_HW_WATCH_LIMIT) return 1; + } + return -1; +} + +CORE_ADDR +sparclite_stopped_data_address() +{ + CORE_ADDR dsr, dda1, dda2; + + dsr = read_register (DSR_REGNUM); + dda1 = read_register (DDA1_REGNUM); + dda2 = read_register (DDA2_REGNUM); + + if (dsr & 0x10) return dda1; + else if (dsr & 0x20) return dda2; + else return 0; +} diff --git a/gdb/sparclite-stub.c b/gdb/sparclite-stub.c index 3d60186eef..e69de29bb2 100644 --- a/gdb/sparclite-stub.c +++ b/gdb/sparclite-stub.c @@ -1,984 +0,0 @@ -/**************************************************************************** - - THIS SOFTWARE IS NOT COPYRIGHTED - - HP offers the following for use in the public domain. HP makes no - warranty with regard to the software or it's performance and the - user accepts the software "AS IS" with all faults. - - HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD - TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES - OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - -****************************************************************************/ - -/**************************************************************************** - * Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $ - * - * Module name: remcom.c $ - * Revision: 1.34 $ - * Date: 91/03/09 12:29:49 $ - * Contributor: Lake Stevens Instrument Division$ - * - * Description: low level support for gdb debugger. $ - * - * Considerations: only works on target hardware $ - * - * Written by: Glenn Engel $ - * ModuleState: Experimental $ - * - * NOTES: See Below $ - * - * Modified for SPARC by Stu Grossman, Cygnus Support. - * Based on sparc-stub.c, it's modified for SPARClite Debug Unit hardware - * breakpoint support to create sparclite-stub.c, by Kung Hsu, Cygnus Support. - * - * This code has been extensively tested on the Fujitsu SPARClite demo board. - * - * To enable debugger support, two things need to happen. One, a - * call to set_debug_traps() is necessary in order to allow any breakpoints - * or error conditions to be properly intercepted and reported to gdb. - * Two, a breakpoint needs to be generated to begin communication. This - * is most easily accomplished by a call to breakpoint(). Breakpoint() - * simulates a breakpoint by executing a trap #1. - * - ************* - * - * The following gdb commands are supported: - * - * command function Return value - * - * g return the value of the CPU registers hex data or ENN - * G set the value of the CPU registers OK or ENN - * - * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN - * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN - * - * c Resume at current address SNN ( signal NN) - * cAA..AA Continue at address AA..AA SNN - * - * s Step one instruction SNN - * sAA..AA Step one instruction from AA..AA SNN - * - * k kill - * - * ? What was the last sigval ? SNN (signal NN) - * - * bBB..BB Set baud rate to BB..BB OK or BNN, then sets - * baud rate - * - * All commands and responses are sent with a packet which includes a - * checksum. A packet consists of - * - * $#. - * - * where - * :: - * :: < two hex digits computed as modulo 256 sum of > - * - * When a packet is received, it is first acknowledged with either '+' or '-'. - * '+' indicates a successful transfer. '-' indicates a failed transfer. - * - * Example: - * - * Host: Reply: - * $m0,10#2a +$00010203040506070809101112131415#42 - * - ****************************************************************************/ - -#include "defs.h" -#include -#include - -/************************************************************************ - * - * external low-level support routines - */ - -extern putDebugChar(); /* write a single character */ -extern getDebugChar(); /* read and return a single char */ - -/************************************************************************/ -/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/ -/* at least NUMREGBYTES*2 are needed for register packets */ -#define BUFMAX 2048 - -static int initialized = 0; /* !0 means we've been initialized */ - -extern void breakinst(); -static void hw_breakpoint(); -static void set_mem_fault_trap(); -static void get_in_break_mode(); - -static const char hexchars[]="0123456789abcdef"; - -#define NUMREGS 80 - -/* Number of bytes of registers. */ -#define NUMREGBYTES (NUMREGS * 4) -enum regnames {G0, G1, G2, G3, G4, G5, G6, G7, - O0, O1, O2, O3, O4, O5, SP, O7, - L0, L1, L2, L3, L4, L5, L6, L7, - I0, I1, I2, I3, I4, I5, FP, I7, - - F0, F1, F2, F3, F4, F5, F6, F7, - F8, F9, F10, F11, F12, F13, F14, F15, - F16, F17, F18, F19, F20, F21, F22, F23, - F24, F25, F26, F27, F28, F29, F30, F31, - Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR, - DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR }; - -/*************************** ASSEMBLY CODE MACROS *************************/ -/* */ - -extern void trap_low(); - -asm(" - .reserve trapstack, 1000 * 4, \"bss\", 8 - - .data - .align 4 - -in_trap_handler: - .word 0 - - .text - .align 4 - -! This function is called when any SPARC trap (except window overflow or -! underflow) occurs. It makes sure that the invalid register window is still -! available before jumping into C code. It will also restore the world if you -! return from handle_exception. - - .globl _trap_low -_trap_low: - mov %psr, %l0 - mov %wim, %l3 - - srl %l3, %l0, %l4 ! wim >> cwp - cmp %l4, 1 - bne window_fine ! Branch if not in the invalid window - nop - -! Handle window overflow - - mov %g1, %l4 ! Save g1, we use it to hold the wim - srl %l3, 1, %g1 ! Rotate wim right - tst %g1 - bg good_wim ! Branch if new wim is non-zero - -! At this point, we need to bring a 1 into the high order bit of the wim. -! Since we don't want to make any assumptions about the number of register -! windows, we figure it out dynamically so as to setup the wim correctly. - - not %g1 ! Fill g1 with ones - mov %g1, %wim ! Fill the wim with ones - nop - nop - nop - mov %wim, %g1 ! Read back the wim - inc %g1 ! Now g1 has 1 just to left of wim - srl %g1, 1, %g1 ! Now put 1 at top of wim - mov %g0, %wim ! Clear wim so that subsequent save - nop ! won't trap - nop - nop - -good_wim: - save %g0, %g0, %g0 ! Slip into next window - mov %g1, %wim ! Install the new wim - - std %l0, [%sp + 0 * 4] ! save L & I registers - std %l2, [%sp + 2 * 4] - std %l4, [%sp + 4 * 4] - std %l6, [%sp + 6 * 4] - - std %i0, [%sp + 8 * 4] - std %i2, [%sp + 10 * 4] - std %i4, [%sp + 12 * 4] - std %i6, [%sp + 14 * 4] - - restore ! Go back to trap window. - mov %l4, %g1 ! Restore %g1 - -window_fine: - sethi %hi(in_trap_handler), %l4 - ld [%lo(in_trap_handler) + %l4], %l5 - tst %l5 - bg recursive_trap - inc %l5 - - set trapstack+1000*4, %sp ! Switch to trap stack - -recursive_trap: - st %l5, [%lo(in_trap_handler) + %l4] - sub %sp,(16+1+6+1+80)*4,%sp ! Make room for input & locals - ! + hidden arg + arg spill - ! + doubleword alignment - ! + registers[72] local var - - std %g0, [%sp + (24 + 0) * 4] ! registers[Gx] - std %g2, [%sp + (24 + 2) * 4] - std %g4, [%sp + (24 + 4) * 4] - std %g6, [%sp + (24 + 6) * 4] - - std %i0, [%sp + (24 + 8) * 4] ! registers[Ox] - std %i2, [%sp + (24 + 10) * 4] - std %i4, [%sp + (24 + 12) * 4] - std %i6, [%sp + (24 + 14) * 4] - ! F0->F31 not implemented - mov %y, %l4 - mov %tbr, %l5 - st %l4, [%sp + (24 + 64) * 4] ! Y - st %l0, [%sp + (24 + 65) * 4] ! PSR - st %l3, [%sp + (24 + 66) * 4] ! WIM - st %l5, [%sp + (24 + 67) * 4] ! TBR - st %l1, [%sp + (24 + 68) * 4] ! PC - st %l2, [%sp + (24 + 69) * 4] ! NPC - ! CPSR and FPSR not impl - or %l0, 0xf20, %l4 - mov %l4, %psr ! Turn on traps, disable interrupts - nop - nop - nop - call _get_in_break_mode - nop - nop - nop - - sethi %hi(0xff00), %l5 - or %l5, %lo(0xff00), %l5 - - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 72) * 4] ! DIA1, debug instr addr 1 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 73) * 4] ! DIA2, debug instr addr 2 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 74) * 4] ! DDA1, debug data addr 1 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 75) * 4] ! DDA2, debug data addr 2 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 76) * 4] ! DDV1, debug data val 1 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 77) * 4] ! DDV2, debug data val 2 - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 78) * 4] ! DCR, debug control reg - add %l5, 4, %l5 - lda [%l5]0x1, %l4 - st %l4, [%sp + (24 + 79) * 4] ! DSR, debug status reg - nop - nop - or %l0, 0xf20, %l4 - mov %l4, %psr ! Turn on traps, disable interrupts - nop - nop - nop - call _handle_exception - add %sp, 24 * 4, %o0 ! Pass address of registers - -! Reload all of the registers that aren't on the stack - - ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx] - ldd [%sp + (24 + 2) * 4], %g2 - ldd [%sp + (24 + 4) * 4], %g4 - ldd [%sp + (24 + 6) * 4], %g6 - - ldd [%sp + (24 + 8) * 4], %i0 ! registers[Ox] - ldd [%sp + (24 + 10) * 4], %i2 - ldd [%sp + (24 + 12) * 4], %i4 - ldd [%sp + (24 + 14) * 4], %i6 - - sethi %hi(0xff00), %l2 - or %l2, %lo(0xff00), %l2 - ldd [%sp + (24 + 72) * 4], %l4 ! DIA1, debug instr addr 1 - stda %l4, [%l2]0x1 - nop - nop - nop - nop - ldd [%sp + (24 + 74) * 4], %l4 ! DDA1, debug data addr 1 - add %l2, 8, %l2 - stda %l4, [%l2]0x1 - nop - nop - nop - nop - ldd [%sp + (24 + 76) * 4], %l4 ! DDV1, debug data value 1 - add %l2, 8, %l2 - stda %l4, [%l2]0x1 - nop - nop - nop - nop - ld [%sp + (24 + 78) * 4], %l4 ! DCR, debug control reg - ld [%sp + (24 + 79) * 4], %l5 ! DSR, debug control reg - add %l2, 8, %l2 - or %l4, 0x200, %l4 - sta %l4, [%l2]0x1 - add %l2, 4, %l2 - sta %l5, [%l2]0x1 - nop - nop - nop - nop - - ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR - ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC - - restore ! Ensure that previous window is valid - save %g0, %g0, %g0 ! by causing a window_underflow trap - - mov %l0, %y - mov %l1, %psr ! Make sure that traps are disabled - ! for rett - sethi %hi(in_trap_handler), %l4 - ld [%lo(in_trap_handler) + %l4], %l5 - dec %l5 - st %l5, [%lo(in_trap_handler) + %l4] - - jmpl %l2, %g0 ! Restore old PC - rett %l3 ! Restore old nPC -"); - -/* Convert ch from a hex digit to an int */ - -static int -hex(ch) - unsigned char ch; -{ - if (ch >= 'a' && ch <= 'f') - return ch-'a'+10; - if (ch >= '0' && ch <= '9') - return ch-'0'; - if (ch >= 'A' && ch <= 'F') - return ch-'A'+10; - return -1; -} - -/* scan for the sequence $# */ - -static void -getpacket(buffer) - char *buffer; -{ - unsigned char checksum; - unsigned char xmitcsum; - int i; - int count; - unsigned char ch; - - do - { - /* wait around for the start character, ignore all other characters */ - while ((ch = getDebugChar()) != '$') ; - - checksum = 0; - xmitcsum = -1; - - count = 0; - - /* now, read until a # or end of buffer is found */ - while (count < BUFMAX) - { - ch = getDebugChar(); - if (ch == '#') - break; - checksum = checksum + ch; - buffer[count] = ch; - count = count + 1; - } - - if (count >= BUFMAX) - continue; - - buffer[count] = 0; - - if (ch == '#') - { - xmitcsum = hex(getDebugChar()) << 4; - xmitcsum |= hex(getDebugChar()); -#if 0 - /* Humans shouldn't have to figure out checksums to type to it. */ - putDebugChar ('+'); - return; -#endif - if (checksum != xmitcsum) - putDebugChar('-'); /* failed checksum */ - else - { - putDebugChar('+'); /* successful transfer */ - /* if a sequence char is present, reply the sequence ID */ - if (buffer[2] == ':') - { - putDebugChar(buffer[0]); - putDebugChar(buffer[1]); - /* remove sequence chars from buffer */ - count = strlen(buffer); - for (i=3; i <= count; i++) - buffer[i-3] = buffer[i]; - } - } - } - } - while (checksum != xmitcsum); -} - -/* send the packet in buffer. */ - -static void -putpacket(buffer) - unsigned char *buffer; -{ - unsigned char checksum; - int count; - unsigned char ch; - - /* $#. */ - do - { - putDebugChar('$'); - checksum = 0; - count = 0; - - while (ch = buffer[count]) - { - if (! putDebugChar(ch)) - return; - checksum += ch; - count += 1; - } - - putDebugChar('#'); - putDebugChar(hexchars[checksum >> 4]); - putDebugChar(hexchars[checksum & 0xf]); - - } - while (getDebugChar() != '+'); -} - -static char remcomInBuffer[BUFMAX]; -static char remcomOutBuffer[BUFMAX]; - -/* Indicate to caller of mem2hex or hex2mem that there has been an - error. */ -static volatile int mem_err = 0; - -/* Convert the memory pointed to by mem into hex, placing result in buf. - * Return a pointer to the last char put in buf (null), in case of mem fault, - * return 0. - * If MAY_FAULT is non-zero, then we will handle memory faults by returning - * a 0, else treat a fault like any other fault in the stub. - */ - -static unsigned char * -mem2hex(mem, buf, count, may_fault) - unsigned char *mem; - unsigned char *buf; - int count; - int may_fault; -{ - unsigned char ch; - - set_mem_fault_trap(may_fault); - - while (count-- > 0) - { - ch = *mem++; - if (mem_err) - return 0; - *buf++ = hexchars[ch >> 4]; - *buf++ = hexchars[ch & 0xf]; - } - - *buf = 0; - - set_mem_fault_trap(0); - - return buf; -} - -/* convert the hex array pointed to by buf into binary to be placed in mem - * return a pointer to the character AFTER the last byte written */ - -static char * -hex2mem(buf, mem, count, may_fault) - unsigned char *buf; - unsigned char *mem; - int count; - int may_fault; -{ - int i; - unsigned char ch; - - set_mem_fault_trap(may_fault); - - for (i=0; itt && ht->signo; ht++) - exceptionHandler(ht->tt, trap_low); - - /* In case GDB is started before us, ack any packets (presumably - "$?#xx") sitting there. */ - - putDebugChar ('+'); - - initialized = 1; -} - -asm (" -! Trap handler for memory errors. This just sets mem_err to be non-zero. It -! assumes that %l1 is non-zero. This should be safe, as it is doubtful that -! 0 would ever contain code that could mem fault. This routine will skip -! past the faulting instruction after setting mem_err. - - .text - .align 4 - -_fltr_set_mem_err: - sethi %hi(_mem_err), %l0 - st %l1, [%l0 + %lo(_mem_err)] - jmpl %l2, %g0 - rett %l2+4 -"); - -static void -set_mem_fault_trap(enable) - int enable; -{ - extern void fltr_set_mem_err(); - mem_err = 0; - - if (enable) - exceptionHandler(9, fltr_set_mem_err); - else - exceptionHandler(9, trap_low); -} - -asm (" - .text - .align 4 - -_dummy_hw_breakpoint: - jmpl %l2, %g0 - rett %l2+4 - nop - nop -"); - -static void -set_hw_breakpoint_trap(enable) - int enable; -{ - extern void dummy_hw_breakpoint(); - - if (enable) - exceptionHandler(255, dummy_hw_breakpoint); - else - exceptionHandler(255, trap_low); -} - -static void -get_in_break_mode() -{ - set_hw_breakpoint_trap(1); - - asm(" - sethi %hi(0xff10), %l4 - or %l4, %lo(0xff10), %l4 - sta %g0, [%l4]0x1 - nop - nop - nop - "); - - set_hw_breakpoint_trap(0); -} - -/* Convert the SPARC hardware trap type code to a unix signal number. */ - -static int -computeSignal(tt) - int tt; -{ - struct hard_trap_info *ht; - - for (ht = hard_trap_info; ht->tt && ht->signo; ht++) - if (ht->tt == tt) - return ht->signo; - - return SIGHUP; /* default for things we don't know about */ -} - -/* - * While we find nice hex chars, build an int. - * Return number of chars processed. - */ - -static int -hexToInt(char **ptr, int *intValue) -{ - int numChars = 0; - int hexValue; - - *intValue = 0; - - while (**ptr) - { - hexValue = hex(**ptr); - if (hexValue < 0) - break; - - *intValue = (*intValue << 4) | hexValue; - numChars ++; - - (*ptr)++; - } - - return (numChars); -} - -/* - * This function does all command procesing for interfacing to gdb. It - * returns 1 if you should skip the instruction at the trap address, 0 - * otherwise. - */ - - -static void -handle_exception (registers) - unsigned long *registers; -{ - int tt; /* Trap type */ - int sigval; - int addr; - int length; - char *ptr; - unsigned long *sp; - unsigned long dsr; - -/* First, we must force all of the windows to be spilled out */ - - asm(" save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - save %sp, -64, %sp - restore - restore - restore - restore - restore - restore - restore - restore -"); - - if (registers[PC] == (unsigned long)breakinst) - { - registers[PC] = registers[NPC]; - registers[NPC] += 4; - } - sp = (unsigned long *)registers[SP]; - - dsr = (unsigned long)registers[DSR]; - if (dsr & 0x3c) - { - tt = 255; - } - else - { - tt = (registers[TBR] >> 4) & 0xff; - } - - /* reply to host that an exception has occurred */ - sigval = computeSignal(tt); - ptr = remcomOutBuffer; - - *ptr++ = 'T'; - *ptr++ = hexchars[sigval >> 4]; - *ptr++ = hexchars[sigval & 0xf]; - - *ptr++ = hexchars[PC >> 4]; - *ptr++ = hexchars[PC & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((char *)®isters[PC], ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = hexchars[FP >> 4]; - *ptr++ = hexchars[FP & 0xf]; - *ptr++ = ':'; - ptr = mem2hex(sp + 8 + 6, ptr, 4, 0); /* FP */ - *ptr++ = ';'; - - *ptr++ = hexchars[SP >> 4]; - *ptr++ = hexchars[SP & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((char *)&sp, ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = hexchars[NPC >> 4]; - *ptr++ = hexchars[NPC & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((char *)®isters[NPC], ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = hexchars[O7 >> 4]; - *ptr++ = hexchars[O7 & 0xf]; - *ptr++ = ':'; - ptr = mem2hex((char *)®isters[O7], ptr, 4, 0); - *ptr++ = ';'; - - *ptr++ = 0; - - putpacket(remcomOutBuffer); - - while (1) - { - remcomOutBuffer[0] = 0; - - getpacket(remcomInBuffer); - switch (remcomInBuffer[0]) - { - case '?': - remcomOutBuffer[0] = 'S'; - remcomOutBuffer[1] = hexchars[sigval >> 4]; - remcomOutBuffer[2] = hexchars[sigval & 0xf]; - remcomOutBuffer[3] = 0; - break; - - case 'd': - /* toggle debug flag */ - break; - - case 'g': /* return the value of the CPU registers */ - { - ptr = remcomOutBuffer; - ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */ - ptr = mem2hex(sp + 0, ptr, 16 * 4, 0); /* L & I regs */ - memset(ptr, '0', 32 * 8); /* Floating point */ - ptr = mem2hex((char *)®isters[Y], - ptr + 32 * 4 * 2, - 8 * 4, - 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ - mem2hex((char *)®isters[DIA1], ptr, - 8 * 4, 0); /* DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR */ - } - break; - - case 'G': /* set the value of the CPU registers - return OK */ - { - unsigned long *newsp, psr; - - psr = registers[PSR]; - - ptr = &remcomInBuffer[1]; - hex2mem(ptr, (char *)registers, 16 * 4, 0); /* G & O regs */ - hex2mem(ptr + 16 * 4 * 2, sp + 0, 16 * 4, 0); /* L & I regs */ - hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y], - 8 * 4, 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */ - hex2mem(ptr + 72 * 4 * 2, (char *)®isters[DIA1], - 8 * 4, 0); /* DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR */ - - /* See if the stack pointer has moved. If so, then copy the saved - locals and ins to the new location. This keeps the window - overflow and underflow routines happy. */ - - newsp = (unsigned long *)registers[SP]; - if (sp != newsp) - sp = memcpy(newsp, sp, 16 * 4); - - /* Don't allow CWP to be modified. */ - - if (psr != registers[PSR]) - registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f); - - strcpy(remcomOutBuffer,"OK"); - } - break; - - case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ - /* Try to read %x,%x. */ - - ptr = &remcomInBuffer[1]; - - if (hexToInt(&ptr, &addr) - && *ptr++ == ',' - && hexToInt(&ptr, &length)) - { - if (mem2hex((char *)addr, remcomOutBuffer, length, 1)) - break; - - strcpy (remcomOutBuffer, "E03"); - } - else - strcpy(remcomOutBuffer,"E01"); - break; - - case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ - /* Try to read '%x,%x:'. */ - - ptr = &remcomInBuffer[1]; - - if (hexToInt(&ptr, &addr) - && *ptr++ == ',' - && hexToInt(&ptr, &length) - && *ptr++ == ':') - { - if (hex2mem(ptr, (char *)addr, length, 1)) - strcpy(remcomOutBuffer, "OK"); - else - strcpy(remcomOutBuffer, "E03"); - } - else - strcpy(remcomOutBuffer, "E02"); - break; - - case 'c': /* cAA..AA Continue at address AA..AA(optional) */ - /* try to read optional parameter, pc unchanged if no parm */ - - ptr = &remcomInBuffer[1]; - if (hexToInt(&ptr, &addr)) - { - registers[PC] = addr; - registers[NPC] = addr + 4; - } - -/* Need to flush the instruction cache here, as we may have deposited a - breakpoint, and the icache probably has no way of knowing that a data ref to - some location may have changed something that is in the instruction cache. - */ - - flush_i_cache(); - return; - - /* kill the program */ - case 'k' : /* do nothing */ - break; -#if 0 - case 't': /* Test feature */ - asm (" std %f30,[%sp]"); - break; -#endif - case 'r': /* Reset */ - asm ("call 0 - nop "); - break; - -#if 0 -Disabled until we can unscrew this properly - - case 'b': /* bBB... Set baud rate to BB... */ - { - int baudrate; - extern void set_timer_3(); - - ptr = &remcomInBuffer[1]; - if (!hexToInt(&ptr, &baudrate)) - { - strcpy(remcomOutBuffer,"B01"); - break; - } - - /* Convert baud rate to uart clock divider */ - switch (baudrate) - { - case 38400: - baudrate = 16; - break; - case 19200: - baudrate = 33; - break; - case 9600: - baudrate = 65; - break; - default: - strcpy(remcomOutBuffer,"B02"); - goto x1; - } - - putpacket("OK"); /* Ack before changing speed */ - set_timer_3(baudrate); /* Set it */ - } -x1: break; -#endif - } /* switch */ - - /* reply to the request */ - putpacket(remcomOutBuffer); - } -} - -/* This function will generate a breakpoint exception. It is used at the - beginning of a program to sync up with a debugger and can be used - otherwise as a quick means to stop program execution and "break" into - the debugger. */ - -void -breakpoint() -{ - if (!initialized) - return; - - asm(" .globl _breakinst - - _breakinst: ta 1 - "); -} - -static void -hw_breakpoint() -{ - asm(" - ta 127 - "); -} diff --git a/gdb/sparclite-tdep.c b/gdb/sparclite-tdep.c index b3af30b8b0..e69de29bb2 100644 --- a/gdb/sparclite-tdep.c +++ b/gdb/sparclite-tdep.c @@ -1,210 +0,0 @@ -/* Target-dependent code for the Fujitsu SPARCLITE for GDB, the GNU debugger. - Copyright 1994 Free Software Foundation, Inc. - -This file is part of GDB. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -#include "defs.h" -#include "gdbcore.h" -#include "breakpoint.h" - -#define DDA2_SUP_ASI 0xb000000 -#define DDA1_SUP_ASI 0xb0000 - -#define DDA2_ASI_MASK 0xff000000 -#define DDA1_ASI_MASK 0xff0000 -#define DIA2_SUP_MODE 0x8000 -#define DIA1_SUP_MODE 0x4000 -#define DDA2_ENABLE 0x100 -#define DDA1_ENABLE 0x80 -#define DIA2_ENABLE 0x40 -#define DIA1_ENABLE 0x20 -#define DSINGLE_STEP 0x10 -#define DDV_TYPE_MASK 0xc -#define DDV_TYPE_LOAD 0x0 -#define DDV_TYPE_STORE 0x4 -#define DDV_TYPE_ACCESS 0x8 -#define DDV_TYPE_ALWAYS 0xc -#define DDV_COND 0x2 -#define DDV_MASK 0x1 - -int -sparclite_insert_watchpoint(addr, len, type) - CORE_ADDR addr; - int len; - int type; -{ -CORE_ADDR dcr; - - dcr = read_register (DCR_REGNUM); - - if (!(dcr & DDA1_ENABLE)) - { - write_register (DDA1_REGNUM, addr); - dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK); - dcr |= (DDA1_SUP_ASI | DDA1_ENABLE); - if (type == 1) - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK)); - } - else if (type == 0) - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK)); - } - else - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_ACCESS); - } - write_register (DCR_REGNUM, dcr); - } - else if (!(dcr & DDA2_ENABLE)) - { - write_register (DDA2_REGNUM, addr); - dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK); - dcr |= (DDA2_SUP_ASI | DDA2_ENABLE); - if (type == 1) - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK); - } - else if (type == 0) - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK); - } - else - { - write_register (DDV1_REGNUM, 0); - write_register (DDV2_REGNUM, 0xffffffff); - dcr |= (DDV_TYPE_ACCESS); - } - write_register (DCR_REGNUM, dcr); - } - else - return -1; - - return 0; -} - -int -sparclite_remove_watchpoint(addr, len, type) - CORE_ADDR addr; - int len; - int type; -{ -CORE_ADDR dcr, dda1, dda2; - - dcr = read_register (DCR_REGNUM); - dda1 = read_register (DDA1_REGNUM); - dda2 = read_register (DDA2_REGNUM); - - if ((dcr & DDA1_ENABLE) && addr == dda1) { - write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE)); - } - else if ((dcr & DDA2_ENABLE) && addr == dda2) { - write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE)); - } - else - return -1; - - return 0; -} - -int -sparclite_insert_hw_breakpoint(addr, len) - CORE_ADDR addr; - int len; -{ -CORE_ADDR dcr; - - dcr = read_register (DCR_REGNUM); - - if (!(dcr & DIA1_ENABLE)) { - write_register (DIA1_REGNUM, addr); - write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE)); - } - else if (!(dcr & DIA2_ENABLE)) { - write_register (DIA2_REGNUM, addr); - write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE)); - } - else - return -1; - - return 0; -} - -int -sparclite_remove_hw_breakpoint(addr, shadow) - CORE_ADDR addr; - int shadow; -{ -CORE_ADDR dcr, dia1, dia2; - - dcr = read_register (DCR_REGNUM); - dia1 = read_register (DIA1_REGNUM); - dia2 = read_register (DIA2_REGNUM); - - if ((dcr & DIA1_ENABLE) && addr == dia1) { - write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE)); - } - else if ((dcr & DIA2_ENABLE) && addr == dia2) { - write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE)); - } - else - return -1; - - return 0; -} - -int -sparclite_check_watch_resources(type, cnt, ot) - int type; - int cnt; - int ot; -{ - if (type == bp_hardware_breakpoint) { - if (TARGET_HW_BREAK_LIMIT == 0) return 0; - else if (cnt <= TARGET_HW_BREAK_LIMIT) return 1; - } - else { - if (TARGET_HW_WATCH_LIMIT == 0) return 0; - else if (ot) return -1; - else if (cnt <= TARGET_HW_WATCH_LIMIT) return 1; - } - return -1; -} - -CORE_ADDR -sparclite_stopped_data_address() -{ - CORE_ADDR dsr, dda1, dda2; - - dsr = read_register (DSR_REGNUM); - dda1 = read_register (DDA1_REGNUM); - dda2 = read_register (DDA2_REGNUM); - - if (dsr & 0x10) return dda1; - else if (dsr & 0x20) return dda2; - else return 0; -}