diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/shared/comm/i386-stub.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/shared/comm/i386-stub.c | 1171 |
1 files changed, 0 insertions, 1171 deletions
diff --git a/c/src/lib/libbsp/i386/shared/comm/i386-stub.c b/c/src/lib/libbsp/i386/shared/comm/i386-stub.c deleted file mode 100644 index 1eff100e9e..0000000000 --- a/c/src/lib/libbsp/i386/shared/comm/i386-stub.c +++ /dev/null @@ -1,1171 +0,0 @@ -/* - * This is the gdb i386 remote debug stub from gdb 4.XX. - */ - -/**************************************************************************** - - 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 386 by Jim Kingdon, Cygnus Support. - * Modified for RTEMS by Aleksey Romanov, Quality Quorum, Inc. - * - * 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 external function exceptionHandler() is - * used to attach a specific handler to a specific 386 vector number. - * It should use the same privilege level it runs at. It should - * install it as an interrupt gate so that interrupts are masked - * while the handler runs. - * Also, need to assign exceptionHook and oldExceptionHook. - * - * Because gdb will sometimes write to the stack area to execute function - * calls, this program cannot rely on using the supervisor stack so it - * uses it's own stack area reserved in the int array remcomStack. - * - ************* - * - * 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) - * - * All commands and responses are sent with a packet which includes a - * checksum. A packet consists of - * - * $<packet info>#<checksum>. - * - * where - * <packet info> :: <characters representing the command or response> - * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> - * - * 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 <stdio.h> -#include <string.h> -#include <stdbool.h> - -#include <bsp.h> - -/* - * Number of debug registers. - */ -#define NUM_DEBUG_REGISTERS 4 - -/* - * Prototypes we need to avoid warnings but not going into public space. - */ -void bsp_reset(void); -void breakpoint (void); -void set_debug_traps(void); -void set_mem_err(void); -void _returnFromException(void); -void exceptionHandler (int, void (*handler) (void)); - -/************************************************************************ - * - * external low-level support routines - */ -extern int putDebugChar (int ch); /* write a single character */ -extern int getDebugChar (void); /* 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 400 - -static bool initialized = false; /* boolean flag. != 0 means we've been initialized */ - -extern int remote_debug; -/* debug > 0 prints ill-formed commands in valid packets & checksum errors */ - -extern void waitabit (void); - -static const char hexchars[] = "0123456789abcdef"; - -/* Number of registers. */ -#define NUMREGS 16 - -/* Number of bytes per register. */ -#define REGBYTES 4 - -/* Number of bytes of registers. */ -#define NUMREGBYTES (NUMREGS * REGBYTES) - -enum regnames - { - EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI, - PC /* also known as eip */ , - PS /* also known as eflags */ , - CS, SS, DS, ES, FS, GS - }; - -/* - * these should not be static cuz they can be used outside this module - */ - -int i386_gdb_registers[NUMREGS]; - -#define STACKSIZE 10000 -int i386_gdb_remcomStack[STACKSIZE / sizeof (int)]; -int *i386_gdb_stackPtr = &i386_gdb_remcomStack[STACKSIZE / sizeof (int) - 1]; - -static int gdb_connected; - -/*************************** ASSEMBLY CODE MACROS *************************/ -/* */ - -extern void - return_to_prog (void); - -/* Restore the program's registers (including the stack pointer, which - means we get the right stack and don't have to worry about popping our - return address and any stack frames and so on) and return. */ -__asm__ (".text"); -__asm__ (".globl return_to_prog"); -__asm__ ("return_to_prog:"); -__asm__ (" movw i386_gdb_registers+44, %ss"); -__asm__ (" movl i386_gdb_registers+16, %esp"); -__asm__ (" movl i386_gdb_registers+4, %ecx"); -__asm__ (" movl i386_gdb_registers+8, %edx"); -__asm__ (" movl i386_gdb_registers+12, %ebx"); -__asm__ (" movl i386_gdb_registers+20, %ebp"); -__asm__ (" movl i386_gdb_registers+24, %esi"); -__asm__ (" movl i386_gdb_registers+28, %edi"); -__asm__ (" movw i386_gdb_registers+48, %ds"); -__asm__ (" movw i386_gdb_registers+52, %es"); -__asm__ (" movw i386_gdb_registers+56, %fs"); -__asm__ (" movw i386_gdb_registers+60, %gs"); -__asm__ (" movl i386_gdb_registers+36, %eax"); -__asm__ (" pushl %eax"); /* saved eflags */ -__asm__ (" movl i386_gdb_registers+40, %eax"); -__asm__ (" pushl %eax"); /* saved cs */ -__asm__ (" movl i386_gdb_registers+32, %eax"); -__asm__ (" pushl %eax"); /* saved eip */ -__asm__ (" movl i386_gdb_registers, %eax"); -/* use iret to restore pc and flags together so - that trace flag works right. */ -__asm__ (" iret"); - -#define BREAKPOINT() __asm__ (" int $3"); - -/* Put the error code here just in case the user cares. */ -int gdb_i386errcode; -/* Likewise, the vector number here (since GDB only gets the signal - number through the usual means, and that's not very specific). */ -int gdb_i386vector = -1; - -/* GDB stores segment registers in 32-bit words (that's just the way - m-i386v.h is written). So zero the appropriate areas in registers. */ -#define SAVE_REGISTERS1() \ - __asm__ ("movl %eax, i386_gdb_registers"); \ - __asm__ ("movl %ecx, i386_gdb_registers+4"); \ - __asm__ ("movl %edx, i386_gdb_registers+8"); \ - __asm__ ("movl %ebx, i386_gdb_registers+12"); \ - __asm__ ("movl %ebp, i386_gdb_registers+20"); \ - __asm__ ("movl %esi, i386_gdb_registers+24"); \ - __asm__ ("movl %edi, i386_gdb_registers+28"); \ - __asm__ ("movw $0, %ax"); \ - __asm__ ("movw %ds, i386_gdb_registers+48"); \ - __asm__ ("movw %ax, i386_gdb_registers+50"); \ - __asm__ ("movw %es, i386_gdb_registers+52"); \ - __asm__ ("movw %ax, i386_gdb_registers+54"); \ - __asm__ ("movw %fs, i386_gdb_registers+56"); \ - __asm__ ("movw %ax, i386_gdb_registers+58"); \ - __asm__ ("movw %gs, i386_gdb_registers+60"); \ - __asm__ ("movw %ax, i386_gdb_registers+62"); -#define SAVE_ERRCODE() \ - __asm__ ("popl %ebx"); \ - __asm__ ("movl %ebx, gdb_i386errcode"); -#define SAVE_REGISTERS2() \ - __asm__ ("popl %ebx"); /* old eip */ \ - __asm__ ("movl %ebx, i386_gdb_registers+32"); \ - __asm__ ("popl %ebx"); /* old cs */ \ - __asm__ ("movl %ebx, i386_gdb_registers+40"); \ - __asm__ ("movw %ax, i386_gdb_registers+42"); \ - __asm__ ("popl %ebx"); /* old eflags */ \ - __asm__ ("movl %ebx, i386_gdb_registers+36"); \ - /* Now that we've done the pops, we can save the stack pointer."); */ \ - __asm__ ("movw %ss, i386_gdb_registers+44"); \ - __asm__ ("movw %ax, i386_gdb_registers+46"); \ - __asm__ ("movl %esp, i386_gdb_registers+16"); - -/* See if mem_fault_routine is set, if so just IRET to that address. */ -#define CHECK_FAULT() \ - __asm__ ("cmpl $0, mem_fault_routine"); \ - __asm__ ("jne mem_fault"); - -__asm__ (".text"); -__asm__ ("mem_fault:"); -/* OK to clobber temp registers; we're just going to end up in set_mem_err. */ -/* Pop error code from the stack and save it. */ -__asm__ (" popl %eax"); -__asm__ (" movl %eax, gdb_i386errcode"); - -__asm__ (" popl %eax"); /* eip */ -/* We don't want to return there, we want to return to the function - pointed to by mem_fault_routine instead. */ -__asm__ (" movl mem_fault_routine, %eax"); -__asm__ (" popl %ecx"); /* cs (low 16 bits; junk in hi 16 bits). */ -__asm__ (" popl %edx"); /* eflags */ - -/* Remove this stack frame; when we do the iret, we will be going to - the start of a function, so we want the stack to look just like it - would after a "call" instruction. */ -__asm__ (" leave"); - -/* Push the stuff that iret wants. */ -__asm__ (" pushl %edx"); /* eflags */ -__asm__ (" pushl %ecx"); /* cs */ -__asm__ (" pushl %eax"); /* eip */ - -/* Zero mem_fault_routine. */ -__asm__ (" movl $0, %eax"); -__asm__ (" movl %eax, mem_fault_routine"); - -__asm__ ("iret"); - -#define CALL_HOOK() __asm__ ("call _remcomHandler"); - -/* This function is called when a i386 exception occurs. It saves - * all the cpu regs in the registers array, munges the stack a bit, - * and invokes an exception handler (remcom_handler). - * - * stack on entry: stack on exit: - * old eflags vector number - * old cs (zero-filled to 32 bits) - * old eip - * - */ -extern void _catchException3 (void); -__asm__ (".text"); -__asm__ (".globl _catchException3"); -__asm__ ("_catchException3:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $3"); -CALL_HOOK (); - -/* Same thing for exception 1. */ -extern void _catchException1 (void); -__asm__ (".text"); -__asm__ (".globl _catchException1"); -__asm__ ("_catchException1:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $1"); -CALL_HOOK (); - -/* Same thing for exception 0. */ -extern void _catchException0 (void); -__asm__ (".text"); -__asm__ (".globl _catchException0"); -__asm__ ("_catchException0:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $0"); -CALL_HOOK (); - -/* Same thing for exception 4. */ -extern void _catchException4 (void); -__asm__ (".text"); -__asm__ (".globl _catchException4"); -__asm__ ("_catchException4:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $4"); -CALL_HOOK (); - -/* Same thing for exception 5. */ -extern void _catchException5 (void); -__asm__ (".text"); -__asm__ (".globl _catchException5"); -__asm__ ("_catchException5:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $5"); -CALL_HOOK (); - -/* Same thing for exception 6. */ -extern void _catchException6 (void); -__asm__ (".text"); -__asm__ (".globl _catchException6"); -__asm__ ("_catchException6:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $6"); -CALL_HOOK (); - -/* Same thing for exception 7. */ -extern void _catchException7 (void); -__asm__ (".text"); -__asm__ (".globl _catchException7"); -__asm__ ("_catchException7:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $7"); -CALL_HOOK (); - -/* Same thing for exception 8. */ -extern void _catchException8 (void); -__asm__ (".text"); -__asm__ (".globl _catchException8"); -__asm__ ("_catchException8:"); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $8"); -CALL_HOOK (); - -/* Same thing for exception 9. */ -extern void _catchException9 (void); -__asm__ (".text"); -__asm__ (".globl _catchException9"); -__asm__ ("_catchException9:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $9"); -CALL_HOOK (); - -/* Same thing for exception 10. */ -extern void _catchException10 (void); -__asm__ (".text"); -__asm__ (".globl _catchException10"); -__asm__ ("_catchException10:"); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $10"); -CALL_HOOK (); - -/* Same thing for exception 12. */ -extern void _catchException12 (void); -__asm__ (".text"); -__asm__ (".globl _catchException12"); -__asm__ ("_catchException12:"); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $12"); -CALL_HOOK (); - -/* Same thing for exception 16. */ -extern void _catchException16 (void); -__asm__ (".text"); -__asm__ (".globl _catchException16"); -__asm__ ("_catchException16:"); -SAVE_REGISTERS1 (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $16"); -CALL_HOOK (); - -/* For 13, 11, and 14 we have to deal with the CHECK_FAULT stuff. */ - -/* Same thing for exception 13. */ -extern void _catchException13 (void); -__asm__ (".text"); -__asm__ (".globl _catchException13"); -__asm__ ("_catchException13:"); -CHECK_FAULT (); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $13"); -CALL_HOOK (); - -/* Same thing for exception 11. */ -extern void _catchException11 (void); -__asm__ (".text"); -__asm__ (".globl _catchException11"); -__asm__ ("_catchException11:"); -CHECK_FAULT (); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $11"); -CALL_HOOK (); - -/* Same thing for exception 14. */ -extern void _catchException14 (void); -__asm__ (".text"); -__asm__ (".globl _catchException14"); -__asm__ ("_catchException14:"); -CHECK_FAULT (); -SAVE_REGISTERS1 (); -SAVE_ERRCODE (); -SAVE_REGISTERS2 (); -__asm__ ("pushl $14"); -CALL_HOOK (); - -/* - * remcomHandler is a front end for handle_exception. It moves the - * stack pointer into an area reserved for debugger use. - */ -extern void remcomHandler (void); -__asm__ ("_remcomHandler:"); -__asm__ (" popl %eax"); /* pop off return address */ -__asm__ (" popl %eax"); /* get the exception number */ -__asm__ (" movl i386_gdb_stackPtr, %esp"); /* move to remcom stack area */ -__asm__ (" pushl %eax"); /* push exception onto stack */ -__asm__ (" call handle_exception"); /* this never returns */ - -void -_returnFromException (void) -{ - return_to_prog (); -} - -static int -hex (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 $<data>#<checksum> */ -static void -getpacket (char *buffer) -{ - unsigned char checksum; - unsigned char xmitcsum; - int i; - int count; - char ch; - - do - { - /* wait around for the start character, ignore all other characters */ - while ((ch = (getDebugChar () & 0x7f)) != '$'); - checksum = 0; - xmitcsum = -1; - - count = 0; - - /* now, read until a # or end of buffer is found */ - while (count < BUFMAX) - { - ch = getDebugChar () & 0x7f; - if (ch == '#') - break; - checksum = checksum + ch; - buffer[count] = ch; - count = count + 1; - } - buffer[count] = 0; - - if (ch == '#') - { - xmitcsum = hex (getDebugChar () & 0x7f) << 4; - xmitcsum += hex (getDebugChar () & 0x7f); - if ((remote_debug) && (checksum != xmitcsum)) - { - printk ("bad checksum. My count = 0x%x, sent=0x%x. buf=%s\n", - checksum, xmitcsum, buffer); - } - - if (remote_debug) { - printk("GETP: $%s...%s\n", buffer, - checksum == xmitcsum ? "Ack" : "Nack"); - } - - 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 (char *buffer) -{ - /* $<packet info>#<checksum>. */ - while (true) - { - unsigned char checksum; - int count; - char ch; - - if (remote_debug) - printk("PUTP: $%s", buffer); - - putDebugChar ('$'); - checksum = 0; - count = 0; - - while ((ch = buffer[count])) - { - if (!putDebugChar (ch)) - return; - checksum += ch; - count += 1; - } - - putDebugChar ('#'); - putDebugChar (hexchars[checksum >> 4]); - putDebugChar (hexchars[checksum % 16]); - - if (remote_debug) - printk("#%c%c...", hexchars[checksum >> 4], hexchars[checksum % 16]); - - ch = getDebugChar () & 0x7f; - if (ch == '+') { - if (remote_debug) - printk("Ack\n"); - break; - } - if (remote_debug) - printk("Nack(%c)\n", ch); - } -} - -char remcomInBuffer[BUFMAX]; -char remcomOutBuffer[BUFMAX]; -static short error; - -static void -debug_error ( - char *format, - char *parm -) -{ - if (remote_debug) - printk (format, parm); -} - -/* Address of a routine to RTE to if we get a memory fault. */ -static void (*volatile mem_fault_routine) (void) = NULL; - -/* Indicate to caller of mem2hex or hex2mem that there has been an - error. */ -static volatile int mem_err = 0; - -void -set_mem_err (void) -{ - mem_err = 1; -} - -/* These are separate functions so that they are so short and sweet - that the compiler won't save any registers (if there is a fault - to mem_fault, they won't get restored, so there better not be any - saved). */ -static int -get_char (char *addr) -{ - return *addr; -} - -static void -set_char (char *addr, int val) -{ - *addr = val; -} - -/* convert the memory pointed to by mem into hex, placing result in buf */ -/* return a pointer to the last char put in buf (null) */ -/* If MAY_FAULT is non-zero, then we should set mem_err in response to - a fault; if zero treat a fault like any other fault in the stub. */ -static char * -mem2hex (char *mem, char *buf, int count, int may_fault) -{ - int i; - unsigned char ch; - - if (may_fault) - mem_fault_routine = set_mem_err; - for (i = 0; i < count; i++) - { - ch = get_char (mem++); - if (may_fault && mem_err) - return (buf); - *buf++ = hexchars[ch >> 4]; - *buf++ = hexchars[ch % 16]; - } - *buf = 0; - if (may_fault) - mem_fault_routine = NULL; - 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 (char *buf, char *mem, int count, int may_fault) -{ - int i; - unsigned char ch; - - if (may_fault) - mem_fault_routine = set_mem_err; - for (i = 0; i < count; i++) - { - ch = hex (*buf++) << 4; - ch = ch + hex (*buf++); - set_char (mem++, ch); - if (may_fault && mem_err) - return (mem); - } - if (may_fault) - mem_fault_routine = NULL; - return (mem); -} - -/* this function takes the 386 exception vector and attempts to - translate this number into a unix compatible signal value */ -static int -computeSignal (int exceptionVector) -{ - int sigval; - switch (exceptionVector) - { - case 0: - sigval = 8; - break; /* divide by zero */ - case 1: - sigval = 5; - break; /* debug exception */ - case 3: - sigval = 5; - break; /* breakpoint */ - case 4: - sigval = 16; - break; /* into instruction (overflow) */ - case 5: - sigval = 16; - break; /* bound instruction */ - case 6: - sigval = 4; - break; /* Invalid opcode */ - case 7: - sigval = 8; - break; /* coprocessor not available */ - case 8: - sigval = 7; - break; /* double fault */ - case 9: - sigval = 11; - break; /* coprocessor segment overrun */ - case 10: - sigval = 11; - break; /* Invalid TSS */ - case 11: - sigval = 11; - break; /* Segment not present */ - case 12: - sigval = 11; - break; /* stack exception */ - case 13: - sigval = 11; - break; /* general protection */ - case 14: - sigval = 11; - break; /* page fault */ - case 16: - sigval = 7; - break; /* coprocessor error */ - default: - sigval = 7; /* "software generated" */ - } - return (sigval); -} - -/**********************************************/ -/* 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) - { - *intValue = (*intValue << 4) | hexValue; - numChars++; - } - else - break; - - (*ptr)++; - } - - return (numChars); -} - -/* - * Get/Set the DR registers. - */ -static uint32_t getDR7(void) -{ - uint32_t value = 0; - asm volatile (" movl %%dr7, %0;" : "=r" (value) : : ); - return value; -} - -static void setDR7(uint32_t value) -{ - asm volatile (" movl %0, %%dr7;" : : "r" (value) : ); -} - -static uint32_t getDR(int reg) -{ - uint32_t value = 0; - switch (reg) - { - case 0: - asm volatile (" movl %%dr0, %0;" : "=r" (value) : : ); - break; - case 1: - asm volatile (" movl %%dr1, %0;" : "=r" (value) : : ); - break; - case 2: - asm volatile (" movl %%dr2, %0;" : "=r" (value) : : ); - break; - case 3: - asm volatile (" movl %%dr3, %0;" : "=r" (value) : : ); - break; - default: - break; - } - return value; -} - -static void setDR(int reg, uint32_t addr) -{ - switch (reg) - { - case 0: - asm volatile (" movl %0, %%dr0;" : : "r" (addr) : ); - break; - case 1: - asm volatile (" movl %0, %%dr1;" : : "r" (addr) : ); - break; - case 2: - asm volatile (" movl %0, %%dr2;" : : "r" (addr) : ); - break; - case 3: - asm volatile (" movl %0, %%dr3;" : : "r" (addr) : ); - break; - default: - break; - } -} - -/* - * This function does all command procesing for interfacing to gdb. - * - * NOTE: This method is called from assembly code so must be marked - * as used. - */ -static void handle_exception (int exceptionVector) __attribute__((used)); -static void -handle_exception (int exceptionVector) -{ - int sigval; - int addr, length, reg; - char *ptr; - - gdb_i386vector = exceptionVector; - - if (remote_debug) - printk ("GDB: EXECPTION: vector=%d, sr=0x%x, pc=0x%x\n", - exceptionVector, - i386_gdb_registers[PS], - i386_gdb_registers[PC]); - - /* Reply to host that an exception has occurred. Always return the - PC, SP, and FP, since gdb always wants them. */ - ptr = remcomOutBuffer; - *ptr++ = 'T'; - sigval = computeSignal (exceptionVector); - *ptr++ = hexchars[sigval >> 4]; - *ptr++ = hexchars[sigval % 16]; - - *ptr++ = hexchars[ESP]; - *ptr++ = ':'; - mem2hex ((char *) &i386_gdb_registers[ESP], ptr, REGBYTES, 0); - ptr += REGBYTES * 2; - *ptr++ = ';'; - - *ptr++ = hexchars[EBP]; - *ptr++ = ':'; - mem2hex ((char *) &i386_gdb_registers[EBP], ptr, REGBYTES, 0); - ptr += REGBYTES * 2; - *ptr++ = ';'; - - *ptr++ = hexchars[PC]; - *ptr++ = ':'; - mem2hex ((char *) &i386_gdb_registers[PC], ptr, REGBYTES, 0); - ptr += REGBYTES * 2; - *ptr++ = ';'; - - *ptr = '\0'; - - if (gdb_connected) - putpacket (remcomOutBuffer); - - while (1 == 1) - { - error = 0; - remcomOutBuffer[0] = 0; - getpacket (remcomInBuffer); - gdb_connected = 1; - switch (remcomInBuffer[0]) - { - case '?': - remcomOutBuffer[0] = 'S'; - remcomOutBuffer[1] = hexchars[sigval >> 4]; - remcomOutBuffer[2] = hexchars[sigval % 16]; - remcomOutBuffer[3] = 0; - break; - case 'd': /* remove */ - remote_debug = !(remote_debug); /* toggle debug flag */ - break; - case 'g': /* return the value of the CPU registers */ - mem2hex ((char *) i386_gdb_registers, remcomOutBuffer, NUMREGBYTES, 0); - break; - case 'G': /* set the value of the CPU registers - return OK */ - hex2mem (&remcomInBuffer[1], (char *) i386_gdb_registers, NUMREGBYTES, 0); - strcpy (remcomOutBuffer, "OK"); - break; - - case 'P': /* Set specific register */ - ptr = &remcomInBuffer[1]; - if (hexToInt (&ptr, ®) - && *ptr++ == '=') - { - hex2mem (ptr, (char *) &i386_gdb_registers[reg], REGBYTES, 0); - strcpy (remcomOutBuffer, "OK"); - } - else - { - strcpy (remcomOutBuffer, "E01"); - debug_error ("malformed register set command; %s", - remcomInBuffer); - } - break; - - /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ - case 'm': - /* TRY TO READ %x,%x. IF SUCCEED, SET PTR = 0 */ - ptr = &remcomInBuffer[1]; - if (hexToInt (&ptr, &addr)) - if (*(ptr++) == ',') - if (hexToInt (&ptr, &length)) - { - ptr = 0; - mem_err = 0; - mem2hex ((char *) addr, remcomOutBuffer, length, 1); - if (mem_err) - { - strcpy (remcomOutBuffer, "E03"); - debug_error ("memory fault", 0); - } - } - - if (ptr) - { - strcpy (remcomOutBuffer, "E01"); - debug_error ("malformed read memory command: %s", remcomInBuffer); - } - break; - - /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ - case 'M': - /* TRY TO READ '%x,%x:'. IF SUCCEED, SET PTR = 0 */ - ptr = &remcomInBuffer[1]; - if (hexToInt (&ptr, &addr)) - if (*(ptr++) == ',') - if (hexToInt (&ptr, &length)) - if (*(ptr++) == ':') - { - mem_err = 0; - hex2mem (ptr, (char *) addr, length, 1); - - if (mem_err) - { - strcpy (remcomOutBuffer, "E03"); - debug_error ("memory fault", 0); - } - else - { - strcpy (remcomOutBuffer, "OK"); - } - - ptr = 0; - } - if (ptr) - { - strcpy (remcomOutBuffer, "E02"); - debug_error ("malformed write memory command: %s", remcomInBuffer); - } - break; - - /* cAA..AA Continue at address AA..AA(optional) */ - /* sAA..AA Step one instruction from AA..AA(optional) */ - case 'c': - case 's': - /* try to read optional parameter, pc unchanged if no parm */ - ptr = &remcomInBuffer[1]; - if (hexToInt (&ptr, &addr)) - i386_gdb_registers[PC] = addr; - - /* clear the trace bit */ - i386_gdb_registers[PS] &= 0xfffffeff; - - /* set the trace bit if we're stepping */ - if (remcomInBuffer[0] == 's') - i386_gdb_registers[PS] |= 0x100; - - _returnFromException (); /* this is a jump */ - break; - - case 'Z': - case 'z': - /* - * Z1 = execute (00b) - * Z2 = write (01b) - * Z3 = read (??, need to use 11b)) - * Z4 = read/write (11b) - */ - ptr = &remcomInBuffer[1]; - reg = *(ptr++); - if (reg == '0') - break; - printk("hbreak\n"); - switch ((char) reg) - { - case '1': - reg = 0; - break; - case '2': - reg = 1; - case '3': - case '4': - default: - reg = 3; - break; - } - if (*(ptr++) == ',') - { - bool insert = remcomInBuffer[0] == 'Z'; - if (hexToInt (&ptr, &addr)) - { - if (*(ptr++) == ',') - { - uint32_t dr7; - int i; - hexToInt(&ptr, &length); - dr7 = getDR7(); - for (i = 0; i < NUM_DEBUG_REGISTERS; ++i) - { - if ((dr7 & (2 << (i * 2))) == 0) - { - if (insert) - { - setDR(i, addr); - dr7 |= - ((length - 1) << ((i * 2) + 18)) | - (reg << ((i * 2) + 16)) | - (2 << (i * 2)); - setDR7(dr7); - printk("set DR%i to %08x\n", i, addr); - break; - } - } - else if (!insert) - { - uint32_t dra = getDR(i); - if (dra == addr) - { - dr7 &= ~(2 << (i * 2)); - setDR7(dr7); - printk("clear DR%i\n", i); - break; - } - } - } - if (insert && (i == NUM_DEBUG_REGISTERS)) - { - ptr = 0; - } - } - else - { - ptr = 0; - } - } - else - { - ptr = 0; - } - } - else - { - ptr = 0; - } - - if (ptr) - strcpy (remcomOutBuffer, "OK"); - else - strcpy (remcomOutBuffer, "E1"); - break; - - /* Detach. */ - case 'D': - putpacket (remcomOutBuffer); - i386_gdb_registers[PS] &= 0xfffffeff; - _returnFromException (); /* this is a jump */ - break; - - /* kill the program */ - case 'k': /* do nothing */ - bsp_reset(); - continue; - - default: - break; - } /* switch */ - - /* reply to the request */ - putpacket (remcomOutBuffer); - } -} - -/* this function is used to set up exception handlers for tracing and - breakpoints */ -void -set_debug_traps (void) -{ - i386_gdb_stackPtr = &i386_gdb_remcomStack[STACKSIZE / sizeof (int) - 1]; - - exceptionHandler (0, _catchException0); - exceptionHandler (1, _catchException1); - exceptionHandler (3, _catchException3); - exceptionHandler (4, _catchException4); - exceptionHandler (5, _catchException5); - exceptionHandler (6, _catchException6); - exceptionHandler (7, _catchException7); - exceptionHandler (8, _catchException8); - exceptionHandler (9, _catchException9); - exceptionHandler (10, _catchException10); - exceptionHandler (11, _catchException11); - exceptionHandler (12, _catchException12); - exceptionHandler (13, _catchException13); - exceptionHandler (14, _catchException14); - exceptionHandler (16, _catchException16); - - /* In case GDB is started before us, ack any packets (presumably - "$?#xx") sitting there. */ - putDebugChar ('+'); - - initialized = true; - -} - -/* 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 (void) -{ - if (initialized) - { - BREAKPOINT (); - } - waitabit (); -} - -int waitlimit = 1000000; - -void -waitabit (void) -{ - int i; - for (i = 0; i < waitlimit; i++); -} |