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markom |
/****************************************************************************
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THIS SOFTWARE IS NOT COPYRIGHTED
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HP offers the following for use in the public domain. HP makes no
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warranty with regard to the software or it's performance and the
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user accepts the software "AS IS" with all faults.
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HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
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TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
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/****************************************************************************
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* Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
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*
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* Module name: remcom.c $
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* Revision: 1.34 $
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* Date: 91/03/09 12:29:49 $
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* Contributor: Lake Stevens Instrument Division$
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*
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* Description: low level support for gdb debugger. $
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*
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* Considerations: only works on target hardware $
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*
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* Written by: Glenn Engel $
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* ModuleState: Experimental $
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*
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* NOTES: See Below $
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*
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* Modified for SPARC by Stu Grossman, Cygnus Support.
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*
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* This code has been extensively tested on the Fujitsu SPARClite demo board.
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*
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* To enable debugger support, two things need to happen. One, a
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* call to set_debug_traps() is necessary in order to allow any breakpoints
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* or error conditions to be properly intercepted and reported to gdb.
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* Two, a breakpoint needs to be generated to begin communication. This
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* is most easily accomplished by a call to breakpoint(). Breakpoint()
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* simulates a breakpoint by executing a trap #1.
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*
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*************
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*
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* The following gdb commands are supported:
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*
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* command function Return value
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*
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* g return the value of the CPU registers hex data or ENN
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* G set the value of the CPU registers OK or ENN
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*
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* mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
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* MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
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*
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* c Resume at current address SNN ( signal NN)
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* cAA..AA Continue at address AA..AA SNN
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*
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* s Step one instruction SNN
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* sAA..AA Step one instruction from AA..AA SNN
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*
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* k kill
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*
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* ? What was the last sigval ? SNN (signal NN)
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*
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* All commands and responses are sent with a packet which includes a
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* checksum. A packet consists of
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*
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* $<packet info>#<checksum>.
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*
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* where
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* <packet info> :: <characters representing the command or response>
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* <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>>
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*
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* When a packet is received, it is first acknowledged with either '+' or '-'.
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* '+' indicates a successful transfer. '-' indicates a failed transfer.
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*
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* Example:
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*
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* Host: Reply:
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* $m0,10#2a +$00010203040506070809101112131415#42
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*
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****************************************************************************/
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#include <string.h>
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#include <signal.h>
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/************************************************************************
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*
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* external low-level support routines
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*/
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extern void putDebugChar(); /* write a single character */
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extern int getDebugChar(); /* read and return a single char */
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/************************************************************************/
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/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
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/* at least NUMREGBYTES*2 are needed for register packets */
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#define BUFMAX 2048
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static int initialized = 0; /* !0 means we've been initialized */
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static void set_mem_fault_trap();
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static const char hexchars[]="0123456789abcdef";
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#define NUMREGS 72
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/* Number of bytes of registers. */
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#define NUMREGBYTES (NUMREGS * 4)
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enum regnames {G0, G1, G2, G3, G4, G5, G6, G7,
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O0, O1, O2, O3, O4, O5, SP, O7,
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L0, L1, L2, L3, L4, L5, L6, L7,
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I0, I1, I2, I3, I4, I5, FP, I7,
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F0, F1, F2, F3, F4, F5, F6, F7,
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F8, F9, F10, F11, F12, F13, F14, F15,
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F16, F17, F18, F19, F20, F21, F22, F23,
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F24, F25, F26, F27, F28, F29, F30, F31,
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Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR };
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/*************************** ASSEMBLY CODE MACROS *************************/
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/* */
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extern void trap_low();
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asm("
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.reserve trapstack, 1000 * 4, \"bss\", 8
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.data
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.align 4
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in_trap_handler:
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.word 0
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.text
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.align 4
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! This function is called when any SPARC trap (except window overflow or
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! underflow) occurs. It makes sure that the invalid register window is still
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! available before jumping into C code. It will also restore the world if you
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! return from handle_exception.
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.globl _trap_low
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_trap_low:
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mov %psr, %l0
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mov %wim, %l3
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srl %l3, %l0, %l4 ! wim >> cwp
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cmp %l4, 1
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bne window_fine ! Branch if not in the invalid window
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nop
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! Handle window overflow
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mov %g1, %l4 ! Save g1, we use it to hold the wim
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srl %l3, 1, %g1 ! Rotate wim right
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tst %g1
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bg good_wim ! Branch if new wim is non-zero
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nop
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! At this point, we need to bring a 1 into the high order bit of the wim.
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! Since we don't want to make any assumptions about the number of register
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! windows, we figure it out dynamically so as to setup the wim correctly.
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not %g1 ! Fill g1 with ones
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mov %g1, %wim ! Fill the wim with ones
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nop
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nop
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nop
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mov %wim, %g1 ! Read back the wim
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inc %g1 ! Now g1 has 1 just to left of wim
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srl %g1, 1, %g1 ! Now put 1 at top of wim
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mov %g0, %wim ! Clear wim so that subsequent save
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nop ! won't trap
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nop
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nop
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good_wim:
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save %g0, %g0, %g0 ! Slip into next window
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mov %g1, %wim ! Install the new wim
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std %l0, [%sp + 0 * 4] ! save L & I registers
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std %l2, [%sp + 2 * 4]
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std %l4, [%sp + 4 * 4]
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std %l6, [%sp + 6 * 4]
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std %i0, [%sp + 8 * 4]
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std %i2, [%sp + 10 * 4]
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std %i4, [%sp + 12 * 4]
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std %i6, [%sp + 14 * 4]
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restore ! Go back to trap window.
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mov %l4, %g1 ! Restore %g1
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window_fine:
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sethi %hi(in_trap_handler), %l4
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ld [%lo(in_trap_handler) + %l4], %l5
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tst %l5
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bg recursive_trap
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inc %l5
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set trapstack+1000*4, %sp ! Switch to trap stack
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recursive_trap:
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st %l5, [%lo(in_trap_handler) + %l4]
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sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
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! + hidden arg + arg spill
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! + doubleword alignment
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! + registers[72] local var
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std %g0, [%sp + (24 + 0) * 4] ! registers[Gx]
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std %g2, [%sp + (24 + 2) * 4]
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std %g4, [%sp + (24 + 4) * 4]
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std %g6, [%sp + (24 + 6) * 4]
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std %i0, [%sp + (24 + 8) * 4] ! registers[Ox]
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std %i2, [%sp + (24 + 10) * 4]
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std %i4, [%sp + (24 + 12) * 4]
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std %i6, [%sp + (24 + 14) * 4]
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! F0->F31 not implemented
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mov %y, %l4
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mov %tbr, %l5
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st %l4, [%sp + (24 + 64) * 4] ! Y
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st %l0, [%sp + (24 + 65) * 4] ! PSR
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st %l3, [%sp + (24 + 66) * 4] ! WIM
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st %l5, [%sp + (24 + 67) * 4] ! TBR
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st %l1, [%sp + (24 + 68) * 4] ! PC
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| 228 |
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st %l2, [%sp + (24 + 69) * 4] ! NPC
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| 229 |
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| 230 |
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! CPSR and FPSR not impl
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| 232 |
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or %l0, 0xf20, %l4
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mov %l4, %psr ! Turn on traps, disable interrupts
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call _handle_exception
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add %sp, 24 * 4, %o0 ! Pass address of registers
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| 238 |
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! Reload all of the registers that aren't on the stack
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| 240 |
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ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx]
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| 241 |
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ldd [%sp + (24 + 2) * 4], %g2
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ldd [%sp + (24 + 4) * 4], %g4
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| 243 |
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ldd [%sp + (24 + 6) * 4], %g6
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| 244 |
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| 245 |
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ldd [%sp + (24 + 8) * 4], %i0 ! registers[Ox]
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ldd [%sp + (24 + 10) * 4], %i2
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ldd [%sp + (24 + 12) * 4], %i4
|
| 248 |
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ldd [%sp + (24 + 14) * 4], %i6
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| 249 |
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| 250 |
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ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR
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| 251 |
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ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC
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| 252 |
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| 253 |
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restore ! Ensure that previous window is valid
|
| 254 |
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save %g0, %g0, %g0 ! by causing a window_underflow trap
|
| 255 |
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|
| 256 |
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mov %l0, %y
|
| 257 |
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mov %l1, %psr ! Make sure that traps are disabled
|
| 258 |
|
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! for rett
|
| 259 |
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|
| 260 |
|
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sethi %hi(in_trap_handler), %l4
|
| 261 |
|
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ld [%lo(in_trap_handler) + %l4], %l5
|
| 262 |
|
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dec %l5
|
| 263 |
|
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st %l5, [%lo(in_trap_handler) + %l4]
|
| 264 |
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|
|
| 265 |
|
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jmpl %l2, %g0 ! Restore old PC
|
| 266 |
|
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rett %l3 ! Restore old nPC
|
| 267 |
|
|
");
|
| 268 |
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|
| 269 |
|
|
/* Convert ch from a hex digit to an int */
|
| 270 |
|
|
|
| 271 |
|
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static int
|
| 272 |
|
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hex (unsigned char ch)
|
| 273 |
|
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{
|
| 274 |
|
|
if (ch >= 'a' && ch <= 'f')
|
| 275 |
|
|
return ch-'a'+10;
|
| 276 |
|
|
if (ch >= '0' && ch <= '9')
|
| 277 |
|
|
return ch-'0';
|
| 278 |
|
|
if (ch >= 'A' && ch <= 'F')
|
| 279 |
|
|
return ch-'A'+10;
|
| 280 |
|
|
return -1;
|
| 281 |
|
|
}
|
| 282 |
|
|
|
| 283 |
|
|
static char remcomInBuffer[BUFMAX];
|
| 284 |
|
|
static char remcomOutBuffer[BUFMAX];
|
| 285 |
|
|
|
| 286 |
|
|
/* scan for the sequence $<data>#<checksum> */
|
| 287 |
|
|
|
| 288 |
|
|
unsigned char *
|
| 289 |
|
|
getpacket (void)
|
| 290 |
|
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{
|
| 291 |
|
|
unsigned char *buffer = &remcomInBuffer[0];
|
| 292 |
|
|
unsigned char checksum;
|
| 293 |
|
|
unsigned char xmitcsum;
|
| 294 |
|
|
int count;
|
| 295 |
|
|
char ch;
|
| 296 |
|
|
|
| 297 |
|
|
while (1)
|
| 298 |
|
|
{
|
| 299 |
|
|
/* wait around for the start character, ignore all other characters */
|
| 300 |
|
|
while ((ch = getDebugChar ()) != '$')
|
| 301 |
|
|
;
|
| 302 |
|
|
|
| 303 |
|
|
retry:
|
| 304 |
|
|
checksum = 0;
|
| 305 |
|
|
xmitcsum = -1;
|
| 306 |
|
|
count = 0;
|
| 307 |
|
|
|
| 308 |
|
|
/* now, read until a # or end of buffer is found */
|
| 309 |
|
|
while (count < BUFMAX)
|
| 310 |
|
|
{
|
| 311 |
|
|
ch = getDebugChar ();
|
| 312 |
|
|
if (ch == '$')
|
| 313 |
|
|
goto retry;
|
| 314 |
|
|
if (ch == '#')
|
| 315 |
|
|
break;
|
| 316 |
|
|
checksum = checksum + ch;
|
| 317 |
|
|
buffer[count] = ch;
|
| 318 |
|
|
count = count + 1;
|
| 319 |
|
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}
|
| 320 |
|
|
buffer[count] = 0;
|
| 321 |
|
|
|
| 322 |
|
|
if (ch == '#')
|
| 323 |
|
|
{
|
| 324 |
|
|
ch = getDebugChar ();
|
| 325 |
|
|
xmitcsum = hex (ch) << 4;
|
| 326 |
|
|
ch = getDebugChar ();
|
| 327 |
|
|
xmitcsum += hex (ch);
|
| 328 |
|
|
|
| 329 |
|
|
if (checksum != xmitcsum)
|
| 330 |
|
|
{
|
| 331 |
|
|
putDebugChar ('-'); /* failed checksum */
|
| 332 |
|
|
}
|
| 333 |
|
|
else
|
| 334 |
|
|
{
|
| 335 |
|
|
putDebugChar ('+'); /* successful transfer */
|
| 336 |
|
|
|
| 337 |
|
|
/* if a sequence char is present, reply the sequence ID */
|
| 338 |
|
|
if (buffer[2] == ':')
|
| 339 |
|
|
{
|
| 340 |
|
|
putDebugChar (buffer[0]);
|
| 341 |
|
|
putDebugChar (buffer[1]);
|
| 342 |
|
|
|
| 343 |
|
|
return &buffer[3];
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
return &buffer[0];
|
| 347 |
|
|
}
|
| 348 |
|
|
}
|
| 349 |
|
|
}
|
| 350 |
|
|
}
|
| 351 |
|
|
|
| 352 |
|
|
/* send the packet in buffer. */
|
| 353 |
|
|
|
| 354 |
|
|
static void
|
| 355 |
|
|
putpacket (unsigned char *buffer)
|
| 356 |
|
|
{
|
| 357 |
|
|
unsigned char checksum;
|
| 358 |
|
|
int count;
|
| 359 |
|
|
unsigned char ch;
|
| 360 |
|
|
|
| 361 |
|
|
/* $<packet info>#<checksum>. */
|
| 362 |
|
|
do
|
| 363 |
|
|
{
|
| 364 |
|
|
putDebugChar('$');
|
| 365 |
|
|
checksum = 0;
|
| 366 |
|
|
count = 0;
|
| 367 |
|
|
|
| 368 |
|
|
while (ch = buffer[count])
|
| 369 |
|
|
{
|
| 370 |
|
|
putDebugChar(ch);
|
| 371 |
|
|
checksum += ch;
|
| 372 |
|
|
count += 1;
|
| 373 |
|
|
}
|
| 374 |
|
|
|
| 375 |
|
|
putDebugChar('#');
|
| 376 |
|
|
putDebugChar(hexchars[checksum >> 4]);
|
| 377 |
|
|
putDebugChar(hexchars[checksum & 0xf]);
|
| 378 |
|
|
|
| 379 |
|
|
}
|
| 380 |
|
|
while (getDebugChar() != '+');
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
/* Indicate to caller of mem2hex or hex2mem that there has been an
|
| 384 |
|
|
error. */
|
| 385 |
|
|
static volatile int mem_err = 0;
|
| 386 |
|
|
|
| 387 |
|
|
/* Convert the memory pointed to by mem into hex, placing result in buf.
|
| 388 |
|
|
* Return a pointer to the last char put in buf (null), in case of mem fault,
|
| 389 |
|
|
* return 0.
|
| 390 |
|
|
* If MAY_FAULT is non-zero, then we will handle memory faults by returning
|
| 391 |
|
|
* a 0, else treat a fault like any other fault in the stub.
|
| 392 |
|
|
*/
|
| 393 |
|
|
|
| 394 |
|
|
static unsigned char *
|
| 395 |
|
|
mem2hex (unsigned char *mem, unsigned char *buf, int count, int may_fault)
|
| 396 |
|
|
{
|
| 397 |
|
|
unsigned char ch;
|
| 398 |
|
|
|
| 399 |
|
|
set_mem_fault_trap(may_fault);
|
| 400 |
|
|
|
| 401 |
|
|
while (count-- > 0)
|
| 402 |
|
|
{
|
| 403 |
|
|
ch = *mem++;
|
| 404 |
|
|
if (mem_err)
|
| 405 |
|
|
return 0;
|
| 406 |
|
|
*buf++ = hexchars[ch >> 4];
|
| 407 |
|
|
*buf++ = hexchars[ch & 0xf];
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
*buf = 0;
|
| 411 |
|
|
|
| 412 |
|
|
set_mem_fault_trap(0);
|
| 413 |
|
|
|
| 414 |
|
|
return buf;
|
| 415 |
|
|
}
|
| 416 |
|
|
|
| 417 |
|
|
/* convert the hex array pointed to by buf into binary to be placed in mem
|
| 418 |
|
|
* return a pointer to the character AFTER the last byte written */
|
| 419 |
|
|
|
| 420 |
|
|
static char *
|
| 421 |
|
|
hex2mem (unsigned char *buf, unsigned char *mem, int count, int may_fault)
|
| 422 |
|
|
{
|
| 423 |
|
|
int i;
|
| 424 |
|
|
unsigned char ch;
|
| 425 |
|
|
|
| 426 |
|
|
set_mem_fault_trap(may_fault);
|
| 427 |
|
|
|
| 428 |
|
|
for (i=0; i<count; i++)
|
| 429 |
|
|
{
|
| 430 |
|
|
ch = hex(*buf++) << 4;
|
| 431 |
|
|
ch |= hex(*buf++);
|
| 432 |
|
|
*mem++ = ch;
|
| 433 |
|
|
if (mem_err)
|
| 434 |
|
|
return 0;
|
| 435 |
|
|
}
|
| 436 |
|
|
|
| 437 |
|
|
set_mem_fault_trap(0);
|
| 438 |
|
|
|
| 439 |
|
|
return mem;
|
| 440 |
|
|
}
|
| 441 |
|
|
|
| 442 |
|
|
/* This table contains the mapping between SPARC hardware trap types, and
|
| 443 |
|
|
signals, which are primarily what GDB understands. It also indicates
|
| 444 |
|
|
which hardware traps we need to commandeer when initializing the stub. */
|
| 445 |
|
|
|
| 446 |
|
|
static struct hard_trap_info
|
| 447 |
|
|
{
|
| 448 |
|
|
unsigned char tt; /* Trap type code for SPARClite */
|
| 449 |
|
|
unsigned char signo; /* Signal that we map this trap into */
|
| 450 |
|
|
} hard_trap_info[] = {
|
| 451 |
|
|
{1, SIGSEGV}, /* instruction access error */
|
| 452 |
|
|
{2, SIGILL}, /* privileged instruction */
|
| 453 |
|
|
{3, SIGILL}, /* illegal instruction */
|
| 454 |
|
|
{4, SIGEMT}, /* fp disabled */
|
| 455 |
|
|
{36, SIGEMT}, /* cp disabled */
|
| 456 |
|
|
{7, SIGBUS}, /* mem address not aligned */
|
| 457 |
|
|
{9, SIGSEGV}, /* data access exception */
|
| 458 |
|
|
{10, SIGEMT}, /* tag overflow */
|
| 459 |
|
|
{128+1, SIGTRAP}, /* ta 1 - normal breakpoint instruction */
|
| 460 |
|
|
{0, 0} /* Must be last */
|
| 461 |
|
|
};
|
| 462 |
|
|
|
| 463 |
|
|
/* Set up exception handlers for tracing and breakpoints */
|
| 464 |
|
|
|
| 465 |
|
|
void
|
| 466 |
|
|
set_debug_traps (void)
|
| 467 |
|
|
{
|
| 468 |
|
|
struct hard_trap_info *ht;
|
| 469 |
|
|
|
| 470 |
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
| 471 |
|
|
exceptionHandler(ht->tt, trap_low);
|
| 472 |
|
|
|
| 473 |
|
|
initialized = 1;
|
| 474 |
|
|
}
|
| 475 |
|
|
|
| 476 |
|
|
asm ("
|
| 477 |
|
|
! Trap handler for memory errors. This just sets mem_err to be non-zero. It
|
| 478 |
|
|
! assumes that %l1 is non-zero. This should be safe, as it is doubtful that
|
| 479 |
|
|
! 0 would ever contain code that could mem fault. This routine will skip
|
| 480 |
|
|
! past the faulting instruction after setting mem_err.
|
| 481 |
|
|
|
| 482 |
|
|
.text
|
| 483 |
|
|
.align 4
|
| 484 |
|
|
|
| 485 |
|
|
_fltr_set_mem_err:
|
| 486 |
|
|
sethi %hi(_mem_err), %l0
|
| 487 |
|
|
st %l1, [%l0 + %lo(_mem_err)]
|
| 488 |
|
|
jmpl %l2, %g0
|
| 489 |
|
|
rett %l2+4
|
| 490 |
|
|
");
|
| 491 |
|
|
|
| 492 |
|
|
static void
|
| 493 |
|
|
set_mem_fault_trap (int enable)
|
| 494 |
|
|
{
|
| 495 |
|
|
extern void fltr_set_mem_err();
|
| 496 |
|
|
mem_err = 0;
|
| 497 |
|
|
|
| 498 |
|
|
if (enable)
|
| 499 |
|
|
exceptionHandler(9, fltr_set_mem_err);
|
| 500 |
|
|
else
|
| 501 |
|
|
exceptionHandler(9, trap_low);
|
| 502 |
|
|
}
|
| 503 |
|
|
|
| 504 |
|
|
/* Convert the SPARC hardware trap type code to a unix signal number. */
|
| 505 |
|
|
|
| 506 |
|
|
static int
|
| 507 |
|
|
computeSignal (int tt)
|
| 508 |
|
|
{
|
| 509 |
|
|
struct hard_trap_info *ht;
|
| 510 |
|
|
|
| 511 |
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
| 512 |
|
|
if (ht->tt == tt)
|
| 513 |
|
|
return ht->signo;
|
| 514 |
|
|
|
| 515 |
|
|
return SIGHUP; /* default for things we don't know about */
|
| 516 |
|
|
}
|
| 517 |
|
|
|
| 518 |
|
|
/*
|
| 519 |
|
|
* While we find nice hex chars, build an int.
|
| 520 |
|
|
* Return number of chars processed.
|
| 521 |
|
|
*/
|
| 522 |
|
|
|
| 523 |
|
|
static int
|
| 524 |
|
|
hexToInt(char **ptr, int *intValue)
|
| 525 |
|
|
{
|
| 526 |
|
|
int numChars = 0;
|
| 527 |
|
|
int hexValue;
|
| 528 |
|
|
|
| 529 |
|
|
*intValue = 0;
|
| 530 |
|
|
|
| 531 |
|
|
while (**ptr)
|
| 532 |
|
|
{
|
| 533 |
|
|
hexValue = hex(**ptr);
|
| 534 |
|
|
if (hexValue < 0)
|
| 535 |
|
|
break;
|
| 536 |
|
|
|
| 537 |
|
|
*intValue = (*intValue << 4) | hexValue;
|
| 538 |
|
|
numChars ++;
|
| 539 |
|
|
|
| 540 |
|
|
(*ptr)++;
|
| 541 |
|
|
}
|
| 542 |
|
|
|
| 543 |
|
|
return (numChars);
|
| 544 |
|
|
}
|
| 545 |
|
|
|
| 546 |
|
|
/*
|
| 547 |
|
|
* This function does all command procesing for interfacing to gdb. It
|
| 548 |
|
|
* returns 1 if you should skip the instruction at the trap address, 0
|
| 549 |
|
|
* otherwise.
|
| 550 |
|
|
*/
|
| 551 |
|
|
|
| 552 |
|
|
extern void breakinst();
|
| 553 |
|
|
|
| 554 |
|
|
static void
|
| 555 |
|
|
handle_exception (unsigned long *registers)
|
| 556 |
|
|
{
|
| 557 |
|
|
int tt; /* Trap type */
|
| 558 |
|
|
int sigval;
|
| 559 |
|
|
int addr;
|
| 560 |
|
|
int length;
|
| 561 |
|
|
char *ptr;
|
| 562 |
|
|
unsigned long *sp;
|
| 563 |
|
|
|
| 564 |
|
|
/* First, we must force all of the windows to be spilled out */
|
| 565 |
|
|
|
| 566 |
|
|
asm(" save %sp, -64, %sp
|
| 567 |
|
|
save %sp, -64, %sp
|
| 568 |
|
|
save %sp, -64, %sp
|
| 569 |
|
|
save %sp, -64, %sp
|
| 570 |
|
|
save %sp, -64, %sp
|
| 571 |
|
|
save %sp, -64, %sp
|
| 572 |
|
|
save %sp, -64, %sp
|
| 573 |
|
|
save %sp, -64, %sp
|
| 574 |
|
|
restore
|
| 575 |
|
|
restore
|
| 576 |
|
|
restore
|
| 577 |
|
|
restore
|
| 578 |
|
|
restore
|
| 579 |
|
|
restore
|
| 580 |
|
|
restore
|
| 581 |
|
|
restore
|
| 582 |
|
|
");
|
| 583 |
|
|
|
| 584 |
|
|
if (registers[PC] == (unsigned long)breakinst)
|
| 585 |
|
|
{
|
| 586 |
|
|
registers[PC] = registers[NPC];
|
| 587 |
|
|
registers[NPC] += 4;
|
| 588 |
|
|
}
|
| 589 |
|
|
|
| 590 |
|
|
sp = (unsigned long *)registers[SP];
|
| 591 |
|
|
|
| 592 |
|
|
tt = (registers[TBR] >> 4) & 0xff;
|
| 593 |
|
|
|
| 594 |
|
|
/* reply to host that an exception has occurred */
|
| 595 |
|
|
sigval = computeSignal(tt);
|
| 596 |
|
|
ptr = remcomOutBuffer;
|
| 597 |
|
|
|
| 598 |
|
|
*ptr++ = 'T';
|
| 599 |
|
|
*ptr++ = hexchars[sigval >> 4];
|
| 600 |
|
|
*ptr++ = hexchars[sigval & 0xf];
|
| 601 |
|
|
|
| 602 |
|
|
*ptr++ = hexchars[PC >> 4];
|
| 603 |
|
|
*ptr++ = hexchars[PC & 0xf];
|
| 604 |
|
|
*ptr++ = ':';
|
| 605 |
|
|
ptr = mem2hex((char *)®isters[PC], ptr, 4, 0);
|
| 606 |
|
|
*ptr++ = ';';
|
| 607 |
|
|
|
| 608 |
|
|
*ptr++ = hexchars[FP >> 4];
|
| 609 |
|
|
*ptr++ = hexchars[FP & 0xf];
|
| 610 |
|
|
*ptr++ = ':';
|
| 611 |
|
|
ptr = mem2hex(sp + 8 + 6, ptr, 4, 0); /* FP */
|
| 612 |
|
|
*ptr++ = ';';
|
| 613 |
|
|
|
| 614 |
|
|
*ptr++ = hexchars[SP >> 4];
|
| 615 |
|
|
*ptr++ = hexchars[SP & 0xf];
|
| 616 |
|
|
*ptr++ = ':';
|
| 617 |
|
|
ptr = mem2hex((char *)&sp, ptr, 4, 0);
|
| 618 |
|
|
*ptr++ = ';';
|
| 619 |
|
|
|
| 620 |
|
|
*ptr++ = hexchars[NPC >> 4];
|
| 621 |
|
|
*ptr++ = hexchars[NPC & 0xf];
|
| 622 |
|
|
*ptr++ = ':';
|
| 623 |
|
|
ptr = mem2hex((char *)®isters[NPC], ptr, 4, 0);
|
| 624 |
|
|
*ptr++ = ';';
|
| 625 |
|
|
|
| 626 |
|
|
*ptr++ = hexchars[O7 >> 4];
|
| 627 |
|
|
*ptr++ = hexchars[O7 & 0xf];
|
| 628 |
|
|
*ptr++ = ':';
|
| 629 |
|
|
ptr = mem2hex((char *)®isters[O7], ptr, 4, 0);
|
| 630 |
|
|
*ptr++ = ';';
|
| 631 |
|
|
|
| 632 |
|
|
*ptr++ = 0;
|
| 633 |
|
|
|
| 634 |
|
|
putpacket(remcomOutBuffer);
|
| 635 |
|
|
|
| 636 |
|
|
while (1)
|
| 637 |
|
|
{
|
| 638 |
|
|
remcomOutBuffer[0] = 0;
|
| 639 |
|
|
|
| 640 |
|
|
ptr = getpacket();
|
| 641 |
|
|
switch (*ptr++)
|
| 642 |
|
|
{
|
| 643 |
|
|
case '?':
|
| 644 |
|
|
remcomOutBuffer[0] = 'S';
|
| 645 |
|
|
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
| 646 |
|
|
remcomOutBuffer[2] = hexchars[sigval & 0xf];
|
| 647 |
|
|
remcomOutBuffer[3] = 0;
|
| 648 |
|
|
break;
|
| 649 |
|
|
|
| 650 |
|
|
case 'd': /* toggle debug flag */
|
| 651 |
|
|
break;
|
| 652 |
|
|
|
| 653 |
|
|
case 'g': /* return the value of the CPU registers */
|
| 654 |
|
|
{
|
| 655 |
|
|
ptr = remcomOutBuffer;
|
| 656 |
|
|
ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */
|
| 657 |
|
|
ptr = mem2hex(sp + 0, ptr, 16 * 4, 0); /* L & I regs */
|
| 658 |
|
|
memset(ptr, '0', 32 * 8); /* Floating point */
|
| 659 |
|
|
mem2hex((char *)®isters[Y],
|
| 660 |
|
|
ptr + 32 * 4 * 2,
|
| 661 |
|
|
8 * 4,
|
| 662 |
|
|
0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
|
| 663 |
|
|
}
|
| 664 |
|
|
break;
|
| 665 |
|
|
|
| 666 |
|
|
case 'G': /* set the value of the CPU registers - return OK */
|
| 667 |
|
|
{
|
| 668 |
|
|
unsigned long *newsp, psr;
|
| 669 |
|
|
|
| 670 |
|
|
psr = registers[PSR];
|
| 671 |
|
|
|
| 672 |
|
|
hex2mem(ptr, (char *)registers, 16 * 4, 0); /* G & O regs */
|
| 673 |
|
|
hex2mem(ptr + 16 * 4 * 2, sp + 0, 16 * 4, 0); /* L & I regs */
|
| 674 |
|
|
hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y],
|
| 675 |
|
|
8 * 4, 0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
|
| 676 |
|
|
|
| 677 |
|
|
/* See if the stack pointer has moved. If so, then copy the saved
|
| 678 |
|
|
locals and ins to the new location. This keeps the window
|
| 679 |
|
|
overflow and underflow routines happy. */
|
| 680 |
|
|
|
| 681 |
|
|
newsp = (unsigned long *)registers[SP];
|
| 682 |
|
|
if (sp != newsp)
|
| 683 |
|
|
sp = memcpy(newsp, sp, 16 * 4);
|
| 684 |
|
|
|
| 685 |
|
|
/* Don't allow CWP to be modified. */
|
| 686 |
|
|
|
| 687 |
|
|
if (psr != registers[PSR])
|
| 688 |
|
|
registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f);
|
| 689 |
|
|
|
| 690 |
|
|
strcpy(remcomOutBuffer,"OK");
|
| 691 |
|
|
}
|
| 692 |
|
|
break;
|
| 693 |
|
|
|
| 694 |
|
|
case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
|
| 695 |
|
|
/* Try to read %x,%x. */
|
| 696 |
|
|
|
| 697 |
|
|
if (hexToInt(&ptr, &addr)
|
| 698 |
|
|
&& *ptr++ == ','
|
| 699 |
|
|
&& hexToInt(&ptr, &length))
|
| 700 |
|
|
{
|
| 701 |
|
|
if (mem2hex((char *)addr, remcomOutBuffer, length, 1))
|
| 702 |
|
|
break;
|
| 703 |
|
|
|
| 704 |
|
|
strcpy (remcomOutBuffer, "E03");
|
| 705 |
|
|
}
|
| 706 |
|
|
else
|
| 707 |
|
|
strcpy(remcomOutBuffer,"E01");
|
| 708 |
|
|
break;
|
| 709 |
|
|
|
| 710 |
|
|
case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
|
| 711 |
|
|
/* Try to read '%x,%x:'. */
|
| 712 |
|
|
|
| 713 |
|
|
if (hexToInt(&ptr, &addr)
|
| 714 |
|
|
&& *ptr++ == ','
|
| 715 |
|
|
&& hexToInt(&ptr, &length)
|
| 716 |
|
|
&& *ptr++ == ':')
|
| 717 |
|
|
{
|
| 718 |
|
|
if (hex2mem(ptr, (char *)addr, length, 1))
|
| 719 |
|
|
strcpy(remcomOutBuffer, "OK");
|
| 720 |
|
|
else
|
| 721 |
|
|
strcpy(remcomOutBuffer, "E03");
|
| 722 |
|
|
}
|
| 723 |
|
|
else
|
| 724 |
|
|
strcpy(remcomOutBuffer, "E02");
|
| 725 |
|
|
break;
|
| 726 |
|
|
|
| 727 |
|
|
case 'c': /* cAA..AA Continue at address AA..AA(optional) */
|
| 728 |
|
|
/* try to read optional parameter, pc unchanged if no parm */
|
| 729 |
|
|
|
| 730 |
|
|
if (hexToInt(&ptr, &addr))
|
| 731 |
|
|
{
|
| 732 |
|
|
registers[PC] = addr;
|
| 733 |
|
|
registers[NPC] = addr + 4;
|
| 734 |
|
|
}
|
| 735 |
|
|
|
| 736 |
|
|
/* Need to flush the instruction cache here, as we may have deposited a
|
| 737 |
|
|
breakpoint, and the icache probably has no way of knowing that a data ref to
|
| 738 |
|
|
some location may have changed something that is in the instruction cache.
|
| 739 |
|
|
*/
|
| 740 |
|
|
|
| 741 |
|
|
flush_i_cache();
|
| 742 |
|
|
return;
|
| 743 |
|
|
|
| 744 |
|
|
/* kill the program */
|
| 745 |
|
|
case 'k' : /* do nothing */
|
| 746 |
|
|
break;
|
| 747 |
|
|
#if 0
|
| 748 |
|
|
case 't': /* Test feature */
|
| 749 |
|
|
asm (" std %f30,[%sp]");
|
| 750 |
|
|
break;
|
| 751 |
|
|
#endif
|
| 752 |
|
|
case 'r': /* Reset */
|
| 753 |
|
|
asm ("call 0
|
| 754 |
|
|
nop ");
|
| 755 |
|
|
break;
|
| 756 |
|
|
} /* switch */
|
| 757 |
|
|
|
| 758 |
|
|
/* reply to the request */
|
| 759 |
|
|
putpacket(remcomOutBuffer);
|
| 760 |
|
|
}
|
| 761 |
|
|
}
|
| 762 |
|
|
|
| 763 |
|
|
/* This function will generate a breakpoint exception. It is used at the
|
| 764 |
|
|
beginning of a program to sync up with a debugger and can be used
|
| 765 |
|
|
otherwise as a quick means to stop program execution and "break" into
|
| 766 |
|
|
the debugger. */
|
| 767 |
|
|
|
| 768 |
|
|
void
|
| 769 |
|
|
breakpoint (void)
|
| 770 |
|
|
{
|
| 771 |
|
|
if (!initialized)
|
| 772 |
|
|
return;
|
| 773 |
|
|
|
| 774 |
|
|
asm(" .globl _breakinst
|
| 775 |
|
|
|
| 776 |
|
|
_breakinst: ta 1
|
| 777 |
|
|
");
|
| 778 |
|
|
}
|
