1182 lines
29 KiB
C
1182 lines
29 KiB
C
/****************************************************************************
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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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* Based on sparc-stub.c, it's modified for SPARClite Debug Unit hardware
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* breakpoint support to create sparclite-stub.c, by Kung Hsu, 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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* P set the value of a single CPU register 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 int remote_debug = 0; /* turn on verbose debugging */
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extern void breakinst();
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void _cprint();
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static void hw_breakpoint();
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static void set_mem_fault_trap();
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static void get_in_break_mode();
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static unsigned char *mem2hex();
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static const char hexchars[]="0123456789abcdef";
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#define NUMREGS 121
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static unsigned long saved_stack_pointer;
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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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CCSR, CCPR, CCCRCR, CCOR, CCOBR, CCIBR, CCIR, UNUSED1,
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ASR1, ASR15, ASR17, ASR18, ASR19, ASR20, ASR21, ASR22,
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/* the following not actually implemented */
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AWR0, AWR1, AWR2, AWR3, AWR4, AWR5, AWR6, AWR7,
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AWR8, AWR9, AWR10, AWR11, AWR12, AWR13, AWR14, AWR15,
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AWR16, AWR17, AWR18, AWR19, AWR20, AWR21, AWR22, AWR23,
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AWR24, AWR25, AWR26, AWR27, AWR28, AWR29, AWR30, AWR31,
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APSR
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};
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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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!
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! On entry, trap_low expects l1 and l2 to contain pc and npc respectivly.
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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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and %l4, 0xff, %l4 ! Mask off windows 28, 29
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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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and %g1, 0xff, %g1 ! Mask off windows 28, 29
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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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! The normal way doesn't work on the sparclet as register windows
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! 28 and 29 are special purpose windows.
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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 0x80, %g1 ! Hack for sparclet
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! This doesn't work on the sparclet.
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!mov %g0, %wim ! Clear wim so that subsequent save
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! won't trap
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andn %l3, 0xff, %l5 ! Clear wim but not windows 28, 29
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mov %l5, %wim
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nop
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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+88)*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[121]
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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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! FP regs (sparclet doesn't have fpu)
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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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st %l2, [%sp + (24 + 69) * 4] ! NPC
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! CPSR and FPSR not impl
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or %l0, 0xf20, %l4
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mov %l4, %psr ! Turn on traps, disable interrupts
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nop
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nop
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nop
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! Save coprocessor state.
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! See SK/demo/hdlc_demo/ldc_swap_context.S.
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mov %psr, %l0
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sethi %hi(0x2000), %l5 ! EC bit in PSR
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or %l5, %l0, %l5
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mov %l5, %psr ! enable coprocessor
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nop ! 3 nops after write to %psr (needed?)
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nop
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nop
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crdcxt %ccsr, %l1 ! capture CCSR
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mov 0x6, %l2
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cwrcxt %l2, %ccsr ! set CCP state machine for CCFR
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crdcxt %ccfr, %l2 ! capture CCOR
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cwrcxt %l2, %ccfr ! tickle CCFR
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crdcxt %ccfr, %l3 ! capture CCOBR
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cwrcxt %l3, %ccfr ! tickle CCFR
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crdcxt %ccfr, %l4 ! capture CCIBR
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cwrcxt %l4, %ccfr ! tickle CCFR
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crdcxt %ccfr, %l5 ! capture CCIR
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cwrcxt %l5, %ccfr ! tickle CCFR
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crdcxt %ccpr, %l6 ! capture CCPR
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crdcxt %cccrcr, %l7 ! capture CCCRCR
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st %l1, [%sp + (24 + 72) * 4] ! save CCSR
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st %l2, [%sp + (24 + 75) * 4] ! save CCOR
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st %l3, [%sp + (24 + 76) * 4] ! save CCOBR
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st %l4, [%sp + (24 + 77) * 4] ! save CCIBR
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st %l5, [%sp + (24 + 78) * 4] ! save CCIR
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st %l6, [%sp + (24 + 73) * 4] ! save CCPR
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st %l7, [%sp + (24 + 74) * 4] ! save CCCRCR
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mov %l0, %psr ! restore original PSR
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nop ! 3 nops after write to %psr (needed?)
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nop
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nop
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! End of saving coprocessor state.
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! Save asr regs
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! Part of this is silly -- we should not display ASR15 or ASR19 at all.
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sethi %hi(0x01000000), %l6
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st %l6, [%sp + (24 + 81) * 4] ! ASR15 == NOP
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sethi %hi(0xdeadc0de), %l6
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or %l6, %lo(0xdeadc0de), %l6
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st %l6, [%sp + (24 + 84) * 4] ! ASR19 == DEADC0DE
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rd %asr1, %l4
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st %l4, [%sp + (24 + 80) * 4]
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! rd %asr15, %l4 ! must not read ASR15
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! st %l4, [%sp + (24 + 81) * 4] ! (illegal instr trap)
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rd %asr17, %l4
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st %l4, [%sp + (24 + 82) * 4]
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rd %asr18, %l4
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st %l4, [%sp + (24 + 83) * 4]
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! rd %asr19, %l4 ! must not read asr19
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! st %l4, [%sp + (24 + 84) * 4] ! (halts the CPU)
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rd %asr20, %l4
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st %l4, [%sp + (24 + 85) * 4]
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rd %asr21, %l4
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st %l4, [%sp + (24 + 86) * 4]
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rd %asr22, %l4
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st %l4, [%sp + (24 + 87) * 4]
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! End of saving asr regs
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call _handle_exception
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add %sp, 24 * 4, %o0 ! Pass address of registers
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! Reload all of the registers that aren't on the stack
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ld [%sp + (24 + 1) * 4], %g1 ! registers[Gx]
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ldd [%sp + (24 + 2) * 4], %g2
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ldd [%sp + (24 + 4) * 4], %g4
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ldd [%sp + (24 + 6) * 4], %g6
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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
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ldd [%sp + (24 + 14) * 4], %i6
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! FP regs (sparclet doesn't have fpu)
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! Update the coprocessor registers.
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! See SK/demo/hdlc_demo/ldc_swap_context.S.
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mov %psr, %l0
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sethi %hi(0x2000), %l5 ! EC bit in PSR
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or %l5, %l0, %l5
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mov %l5, %psr ! enable coprocessor
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nop ! 3 nops after write to %psr (needed?)
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nop
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nop
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mov 0x6, %l2
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cwrcxt %l2, %ccsr ! set CCP state machine for CCFR
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ld [%sp + (24 + 72) * 4], %l1 ! saved CCSR
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ld [%sp + (24 + 75) * 4], %l2 ! saved CCOR
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ld [%sp + (24 + 76) * 4], %l3 ! saved CCOBR
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ld [%sp + (24 + 77) * 4], %l4 ! saved CCIBR
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ld [%sp + (24 + 78) * 4], %l5 ! saved CCIR
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ld [%sp + (24 + 73) * 4], %l6 ! saved CCPR
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ld [%sp + (24 + 74) * 4], %l7 ! saved CCCRCR
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cwrcxt %l2, %ccfr ! restore CCOR
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cwrcxt %l3, %ccfr ! restore CCOBR
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cwrcxt %l4, %ccfr ! restore CCIBR
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cwrcxt %l5, %ccfr ! restore CCIR
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cwrcxt %l6, %ccpr ! restore CCPR
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cwrcxt %l7, %cccrcr ! restore CCCRCR
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cwrcxt %l1, %ccsr ! restore CCSR
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mov %l0, %psr ! restore PSR
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nop ! 3 nops after write to %psr (needed?)
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nop
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nop
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! End of coprocessor handling stuff.
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! Update asr regs
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ld [%sp + (24 + 80) * 4], %l4
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wr %l4, %asr1
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! ld [%sp + (24 + 81) * 4], %l4 ! can't write asr15
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! wr %l4, %asr15
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ld [%sp + (24 + 82) * 4], %l4
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wr %l4, %asr17
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ld [%sp + (24 + 83) * 4], %l4
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wr %l4, %asr18
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! ld [%sp + (24 + 84) * 4], %l4 ! can't write asr19
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! wr %l4, %asr19
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! ld [%sp + (24 + 85) * 4], %l4 ! can't write asr20
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! wr %l4, %asr20
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! ld [%sp + (24 + 86) * 4], %l4 ! can't write asr21
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! wr %l4, %asr21
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ld [%sp + (24 + 87) * 4], %l4
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wr %l4, %asr22
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! End of restoring asr regs
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ldd [%sp + (24 + 64) * 4], %l0 ! Y & PSR
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ldd [%sp + (24 + 68) * 4], %l2 ! PC & NPC
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restore ! Ensure that previous window is valid
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save %g0, %g0, %g0 ! by causing a window_underflow trap
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mov %l0, %y
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mov %l1, %psr ! Make sure that traps are disabled
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! for rett
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nop ! 3 nops after write to %psr (needed?)
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nop
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nop
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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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dec %l5
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st %l5, [%lo(in_trap_handler) + %l4]
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jmpl %l2, %g0 ! Restore old PC
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rett %l3 ! Restore old nPC
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");
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/* Convert ch from a hex digit to an int */
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static int
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hex(ch)
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unsigned char ch;
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{
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if (ch >= 'a' && ch <= 'f')
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return ch-'a'+10;
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if (ch >= '0' && ch <= '9')
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return ch-'0';
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if (ch >= 'A' && ch <= 'F')
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return ch-'A'+10;
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return -1;
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}
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static char remcomInBuffer[BUFMAX];
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static char remcomOutBuffer[BUFMAX];
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/* scan for the sequence $<data>#<checksum> */
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unsigned char *
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getpacket ()
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{
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unsigned char *buffer = &remcomInBuffer[0];
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unsigned char checksum;
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unsigned char xmitcsum;
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int count;
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char ch;
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|
while (1)
|
|
{
|
|
/* wait around for the start character, ignore all other characters */
|
|
while ((ch = getDebugChar ()) != '$')
|
|
;
|
|
|
|
retry:
|
|
checksum = 0;
|
|
xmitcsum = -1;
|
|
count = 0;
|
|
|
|
/* now, read until a # or end of buffer is found */
|
|
while (count < BUFMAX)
|
|
{
|
|
ch = getDebugChar ();
|
|
if (ch == '$')
|
|
goto retry;
|
|
if (ch == '#')
|
|
break;
|
|
checksum = checksum + ch;
|
|
buffer[count] = ch;
|
|
count = count + 1;
|
|
}
|
|
buffer[count] = 0;
|
|
|
|
if (ch == '#')
|
|
{
|
|
ch = getDebugChar ();
|
|
xmitcsum = hex (ch) << 4;
|
|
ch = getDebugChar ();
|
|
xmitcsum += hex (ch);
|
|
|
|
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]);
|
|
|
|
return &buffer[3];
|
|
}
|
|
|
|
return &buffer[0];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* send the packet in buffer. */
|
|
|
|
static void
|
|
putpacket(buffer)
|
|
unsigned char *buffer;
|
|
{
|
|
unsigned char checksum;
|
|
int count;
|
|
unsigned char ch;
|
|
|
|
/* $<packet info>#<checksum>. */
|
|
do
|
|
{
|
|
putDebugChar('$');
|
|
checksum = 0;
|
|
count = 0;
|
|
|
|
while (ch = buffer[count])
|
|
{
|
|
putDebugChar(ch);
|
|
checksum += ch;
|
|
count += 1;
|
|
}
|
|
|
|
putDebugChar('#');
|
|
putDebugChar(hexchars[checksum >> 4]);
|
|
putDebugChar(hexchars[checksum & 0xf]);
|
|
|
|
}
|
|
while (getDebugChar() != '+');
|
|
}
|
|
|
|
/* 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; i<count; i++)
|
|
{
|
|
ch = hex(*buf++) << 4;
|
|
ch |= hex(*buf++);
|
|
*mem++ = ch;
|
|
if (mem_err)
|
|
return 0;
|
|
}
|
|
|
|
set_mem_fault_trap(0);
|
|
|
|
return mem;
|
|
}
|
|
|
|
/* This table contains the mapping between SPARC hardware trap types, and
|
|
signals, which are primarily what GDB understands. It also indicates
|
|
which hardware traps we need to commandeer when initializing the stub. */
|
|
|
|
static struct hard_trap_info
|
|
{
|
|
unsigned char tt; /* Trap type code for SPARClite */
|
|
unsigned char signo; /* Signal that we map this trap into */
|
|
} hard_trap_info[] = {
|
|
{1, SIGSEGV}, /* instruction access exception */
|
|
{0x3b, SIGSEGV}, /* instruction access error */
|
|
{2, SIGILL}, /* illegal instruction */
|
|
{3, SIGILL}, /* privileged instruction */
|
|
{4, SIGEMT}, /* fp disabled */
|
|
{0x24, SIGEMT}, /* cp disabled */
|
|
{7, SIGBUS}, /* mem address not aligned */
|
|
{0x29, SIGSEGV}, /* data access exception */
|
|
{10, SIGEMT}, /* tag overflow */
|
|
{128+1, SIGTRAP}, /* ta 1 - normal breakpoint instruction */
|
|
{0, 0} /* Must be last */
|
|
};
|
|
|
|
/* Set up exception handlers for tracing and breakpoints */
|
|
|
|
void
|
|
set_debug_traps()
|
|
{
|
|
struct hard_trap_info *ht;
|
|
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
|
exceptionHandler(ht->tt, trap_low);
|
|
|
|
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(0x29, fltr_set_mem_err);
|
|
else
|
|
exceptionHandler(0x29, 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()
|
|
{
|
|
#if 0
|
|
int x;
|
|
mesg("get_in_break_mode, sp = ");
|
|
phex(&x);
|
|
#endif
|
|
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("
|
|
! Ugh. sparclet has broken save
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-64,%sp
|
|
!save %sp, -64, %sp
|
|
save
|
|
add %fp,-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];
|
|
|
|
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;
|
|
|
|
ptr = getpacket();
|
|
switch (*ptr++)
|
|
{
|
|
case '?':
|
|
remcomOutBuffer[0] = 'S';
|
|
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
|
remcomOutBuffer[2] = hexchars[sigval & 0xf];
|
|
remcomOutBuffer[3] = 0;
|
|
break;
|
|
|
|
case 'd':
|
|
remote_debug = !(remote_debug); /* 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 */
|
|
ptr = mem2hex((char *)®isters[CCSR],
|
|
ptr,
|
|
8 * 4,
|
|
0); /* CCSR, CCPR, CCCRCR, CCOR, CCOBR, CCIBR, CCIR */
|
|
ptr = mem2hex((char *)®isters[ASR1],
|
|
ptr,
|
|
8 * 4,
|
|
0); /* ASR1,ASR15,ASR17,ASR18,ASR19,ASR20,ASR21,ASR22 */
|
|
#if 0 /* not implemented */
|
|
ptr = mem2hex((char *) ®isters[AWR0],
|
|
ptr,
|
|
32 * 4,
|
|
0); /* Alternate Window Registers */
|
|
#endif
|
|
}
|
|
break;
|
|
|
|
case 'G': /* set value of all the CPU registers - return OK */
|
|
case 'P': /* set value of one CPU register - return OK */
|
|
{
|
|
unsigned long *newsp, psr;
|
|
|
|
psr = registers[PSR];
|
|
|
|
if (ptr[-1] == 'P') /* do a single register */
|
|
{
|
|
int regno;
|
|
|
|
if (hexToInt (&ptr, ®no)
|
|
&& *ptr++ == '=')
|
|
if (regno >= L0 && regno <= I7)
|
|
hex2mem (ptr, sp + regno - L0, 4, 0);
|
|
else
|
|
hex2mem (ptr, (char *)®isters[regno], 4, 0);
|
|
else
|
|
{
|
|
strcpy (remcomOutBuffer, "E01");
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
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[CCSR],
|
|
8 * 4, 0); /* CCSR,CCPR,CCCRCR,CCOR,CCOBR,CCIBR,CCIR */
|
|
hex2mem(ptr + 80 * 4 * 2, (char *)®isters[ASR1],
|
|
8 * 4, 0); /* ASR1 ... ASR22 */
|
|
#if 0 /* not implemented */
|
|
hex2mem(ptr + 88 * 4 * 2, (char *)®isters[AWR0],
|
|
8 * 4, 0); /* Alternate Window Registers */
|
|
#endif
|
|
}
|
|
/* 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. */
|
|
|
|
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:'. */
|
|
|
|
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 */
|
|
|
|
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;
|
|
} /* 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
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|
otherwise as a quick means to stop program execution and "break" into
|
|
the debugger. */
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|
|
|
void
|
|
breakpoint()
|
|
{
|
|
if (!initialized)
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|
return;
|
|
|
|
asm(" .globl _breakinst
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|
|
|
_breakinst: ta 1
|
|
");
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|
}
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|
|
|
static void
|
|
hw_breakpoint()
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|
{
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|
asm("
|
|
ta 127
|
|
");
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|
}
|
|
|
|
#if 0 /* experimental and never finished, left here for reference */
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|
static void
|
|
splet_temp(void)
|
|
{
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|
asm(" sub %sp,(16+1+6+1+121)*4,%sp ! Make room for input & locals
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|
! + hidden arg + arg spill
|
|
! + doubleword alignment
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|
! + registers[121]
|
|
|
|
! Leave a trail of breadcrumbs! (save register save area for debugging)
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|
mov %sp, %l0
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|
add %l0, 24*4, %l0
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|
sethi %hi(_debug_registers), %l1
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|
st %l0, [%lo(_debug_registers) + %l1]
|
|
|
|
! Save the Alternate Register Set: (not implemented yet)
|
|
! To save the Alternate Register set, we must:
|
|
! 1) Save the current SP in some global location.
|
|
! 2) Swap the register sets.
|
|
! 3) Save the Alternate SP in the Y register
|
|
! 4) Fetch the SP that we saved in step 1.
|
|
! 5) Use that to save the rest of the regs (not forgetting ASP in Y)
|
|
! 6) Restore the Alternate SP from Y
|
|
! 7) Swap the registers back.
|
|
|
|
! 1) Copy the current stack pointer to global _SAVED_STACK_POINTER:
|
|
sethi %hi(_saved_stack_pointer), %l0
|
|
st %sp, [%lo(_saved_stack_pointer) + %l0]
|
|
|
|
! 2) Swap the register sets:
|
|
mov %psr, %l1
|
|
sethi %hi(0x10000), %l2
|
|
xor %l1, %l2, %l1
|
|
mov %l1, %psr
|
|
nop ! 3 nops after write to %psr (needed?)
|
|
nop
|
|
nop
|
|
|
|
! 3) Save Alternate L0 in Y
|
|
wr %l0, 0, %y
|
|
|
|
! 4) Load former SP into alternate SP, using L0
|
|
sethi %hi(_saved_stack_pointer), %l0
|
|
or %lo(_saved_stack_pointer), %l0, %l0
|
|
swap [%l0], %sp
|
|
|
|
! 4.5) Restore alternate L0
|
|
rd %y, %l0
|
|
|
|
! 5) Save the Alternate Window Registers
|
|
st %r0, [%sp + (24 + 88) * 4] ! AWR0
|
|
st %r1, [%sp + (24 + 89) * 4] ! AWR1
|
|
st %r2, [%sp + (24 + 90) * 4] ! AWR2
|
|
st %r3, [%sp + (24 + 91) * 4] ! AWR3
|
|
st %r4, [%sp + (24 + 92) * 4] ! AWR4
|
|
st %r5, [%sp + (24 + 93) * 4] ! AWR5
|
|
st %r6, [%sp + (24 + 94) * 4] ! AWR6
|
|
st %r7, [%sp + (24 + 95) * 4] ! AWR7
|
|
st %r8, [%sp + (24 + 96) * 4] ! AWR8
|
|
st %r9, [%sp + (24 + 97) * 4] ! AWR9
|
|
st %r10, [%sp + (24 + 98) * 4] ! AWR10
|
|
st %r11, [%sp + (24 + 99) * 4] ! AWR11
|
|
st %r12, [%sp + (24 + 100) * 4] ! AWR12
|
|
st %r13, [%sp + (24 + 101) * 4] ! AWR13
|
|
! st %r14, [%sp + (24 + 102) * 4] ! AWR14 (SP)
|
|
st %r15, [%sp + (24 + 103) * 4] ! AWR15
|
|
st %r16, [%sp + (24 + 104) * 4] ! AWR16
|
|
st %r17, [%sp + (24 + 105) * 4] ! AWR17
|
|
st %r18, [%sp + (24 + 106) * 4] ! AWR18
|
|
st %r19, [%sp + (24 + 107) * 4] ! AWR19
|
|
st %r20, [%sp + (24 + 108) * 4] ! AWR20
|
|
st %r21, [%sp + (24 + 109) * 4] ! AWR21
|
|
st %r22, [%sp + (24 + 110) * 4] ! AWR22
|
|
st %r23, [%sp + (24 + 111) * 4] ! AWR23
|
|
st %r24, [%sp + (24 + 112) * 4] ! AWR24
|
|
st %r25, [%sp + (24 + 113) * 4] ! AWR25
|
|
st %r26, [%sp + (24 + 114) * 4] ! AWR26
|
|
st %r27, [%sp + (24 + 115) * 4] ! AWR27
|
|
st %r28, [%sp + (24 + 116) * 4] ! AWR28
|
|
st %r29, [%sp + (24 + 117) * 4] ! AWR29
|
|
st %r30, [%sp + (24 + 118) * 4] ! AWR30
|
|
st %r31, [%sp + (24 + 119) * 4] ! AWR21
|
|
|
|
! Get the Alternate PSR (I hope...)
|
|
|
|
rd %psr, %l2
|
|
st %l2, [%sp + (24 + 120) * 4] ! APSR
|
|
|
|
! Don't forget the alternate stack pointer
|
|
|
|
rd %y, %l3
|
|
st %l3, [%sp + (24 + 102) * 4] ! AWR14 (SP)
|
|
|
|
! 6) Restore the Alternate SP (saved in Y)
|
|
|
|
rd %y, %o6
|
|
|
|
|
|
! 7) Swap the registers back:
|
|
|
|
mov %psr, %l1
|
|
sethi %hi(0x10000), %l2
|
|
xor %l1, %l2, %l1
|
|
mov %l1, %psr
|
|
nop ! 3 nops after write to %psr (needed?)
|
|
nop
|
|
nop
|
|
");
|
|
}
|
|
|
|
#endif
|