Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/gdb/sh-stub.c
Linus Nielsen Feltzing f9389fe9fb Cleanup 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@201 a1c6a512-1295-4272-9138-f99709370657
2002-04-23 20:21:31 +00:00

1529 lines
44 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/* sh-stub.c -- debugging stub for the Hitachi-SH.
NOTE!! This code has to be compiled with optimization, otherwise the
function inlining which generates the exception handlers won't work.
*/
/* This is originally based on an m68k software stub written by Glenn
Engel at HP, but has changed quite a bit.
Modifications for the SH by Ben Lee and Steve Chamberlain
Even more modifications for GCC 3.0 and The Rockbox by Linus
Nielsen Feltzing
*/
/****************************************************************************
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.
****************************************************************************/
/* Remote communication protocol.
A debug packet whose contents are <data>
is encapsulated for transmission in the form:
$ <data> # CSUM1 CSUM2
<data> must be ASCII alphanumeric and cannot include characters
'$' or '#'. If <data> starts with two characters followed by
':', then the existing stubs interpret this as a sequence number.
CSUM1 and CSUM2 are ascii hex representation of an 8-bit
checksum of <data>, the most significant nibble is sent first.
the hex digits 0-9,a-f are used.
Receiver responds with:
+ - if CSUM is correct and ready for next packet
- - if CSUM is incorrect
<data> is as follows:
All values are encoded in ascii hex digits.
Request Packet
read registers g
reply XX....X Each byte of register data
is described by two hex digits.
Registers are in the internal order
for GDB, and the bytes in a register
are in the same order the machine uses.
or ENN for an error.
write regs GXX..XX Each byte of register data
is described by two hex digits.
reply OK for success
ENN for an error
write reg Pn...=r... Write register n... with value r...,
which contains two hex digits for each
byte in the register (target byte
order).
reply OK for success
ENN for an error
(not supported by all stubs).
read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
reply XX..XX XX..XX is mem contents
Can be fewer bytes than requested
if able to read only part of the data.
or ENN NN is errno
write mem MAA..AA,LLLL:XX..XX
AA..AA is address,
LLLL is number of bytes,
XX..XX is data
reply OK for success
ENN for an error (this includes the case
where only part of the data was
written).
cont cAA..AA AA..AA is address to resume
If AA..AA is omitted,
resume at same address.
step sAA..AA AA..AA is address to resume
If AA..AA is omitted,
resume at same address.
last signal ? Reply the current reason for stopping.
This is the same reply as is generated
for step or cont : SAA where AA is the
signal number.
There is no immediate reply to step or cont.
The reply comes when the machine stops.
It is SAA AA is the "signal number"
or... TAAn...:r...;n:r...;n...:r...;
AA = signal number
n... = register number
r... = register contents
or... WAA The process exited, and AA is
the exit status. This is only
applicable for certains sorts of
targets.
kill request k
toggle debug d toggle debug flag (see 386 & 68k stubs)
reset r reset -- see sparc stub.
reserved <other> On other requests, the stub should
ignore the request and send an empty
response ($#<checksum>). This way
we can extend the protocol and GDB
can tell whether the stub it is
talking to uses the old or the new.
search tAA:PP,MM Search backwards starting at address
AA for a match with pattern PP and
mask MM. PP and MM are 4 bytes.
Not supported by all stubs.
general query qXXXX Request info about XXXX.
general set QXXXX=yyyy Set value of XXXX to yyyy.
query sect offs qOffsets Get section offsets. Reply is
Text=xxx;Data=yyy;Bss=zzz
console output Otext Send text to stdout. Only comes from
remote target.
Responses can be run-length encoded to save space. A '*' means that
the next character is an ASCII encoding giving a repeat count which
stands for that many repititions of the character preceding the '*'.
The encoding is n+29, yielding a printable character where n >=3
(which is where rle starts to win). Don't use an n > 126.
So
"0* " means the same as "0000". */
#include "sh7034.h"
#include <string.h>
#include <setjmp.h>
#include <signal.h>
/* We need to undefine this from the sh7034.h file */
#undef GBR
/* Hitachi SH architecture instruction encoding masks */
#define COND_BR_MASK 0xff00
#define UCOND_DBR_MASK 0xe000
#define UCOND_RBR_MASK 0xf0df
#define TRAPA_MASK 0xff00
#define COND_DISP 0x00ff
#define UCOND_DISP 0x0fff
#define UCOND_REG 0x0f00
/* Hitachi SH instruction opcodes */
#define BF_INSTR 0x8b00
#define BT_INSTR 0x8900
#define BRA_INSTR 0xa000
#define BSR_INSTR 0xb000
#define JMP_INSTR 0x402b
#define JSR_INSTR 0x400b
#define RTS_INSTR 0x000b
#define RTE_INSTR 0x002b
#define TRAPA_INSTR 0xc300
#define SSTEP_INSTR 0xc37f
/* Hitachi SH processor register masks */
#define T_BIT_MASK 0x0001
/*
* BUFMAX defines the maximum number of characters in inbound/outbound
* buffers. At least NUMREGBYTES*2 are needed for register packets.
*/
#define BUFMAX 1024
/*
* Number of bytes for registers
*/
#define NUMREGBYTES 112 /* 92 */
/*
* Forward declarations
*/
static int hex (char);
static char *mem2hex (char *mem, char *buf, int count);
static char *hex2mem (char *buf, char *mem, int count);
static int hex2int (char **ptr, int *intValue);
static unsigned char *getpacket (void);
static void putpacket (register char *buffer);
static int computeSignal (int exceptionVector);
void handle_buserror (void);
void handle_exception (int exceptionVector);
void init_serial();
void serial_putc (char ch);
char serial_getc (void);
/* These are in the file but in asm statements so the compiler can't see them */
void catch_exception_4 (void);
void catch_exception_5 (void);
void catch_exception_6 (void);
void catch_exception_7 (void);
void catch_exception_8 (void);
void catch_exception_9 (void);
void catch_exception_10 (void);
void catch_exception_11 (void);
void catch_exception_12 (void);
void catch_exception_13 (void);
void catch_exception_14 (void);
void catch_exception_15 (void);
void catch_exception_16 (void);
void catch_exception_17 (void);
void catch_exception_18 (void);
void catch_exception_19 (void);
void catch_exception_20 (void);
void catch_exception_21 (void);
void catch_exception_22 (void);
void catch_exception_23 (void);
void catch_exception_24 (void);
void catch_exception_25 (void);
void catch_exception_26 (void);
void catch_exception_27 (void);
void catch_exception_28 (void);
void catch_exception_29 (void);
void catch_exception_30 (void);
void catch_exception_31 (void);
void catch_exception_32 (void);
void catch_exception_33 (void);
void catch_exception_34 (void);
void catch_exception_35 (void);
void catch_exception_36 (void);
void catch_exception_37 (void);
void catch_exception_38 (void);
void catch_exception_39 (void);
void catch_exception_40 (void);
void catch_exception_41 (void);
void catch_exception_42 (void);
void catch_exception_43 (void);
void catch_exception_44 (void);
void catch_exception_45 (void);
void catch_exception_46 (void);
void catch_exception_47 (void);
void catch_exception_48 (void);
void catch_exception_49 (void);
void catch_exception_50 (void);
void catch_exception_51 (void);
void catch_exception_52 (void);
void catch_exception_53 (void);
void catch_exception_54 (void);
void catch_exception_55 (void);
void catch_exception_56 (void);
void catch_exception_57 (void);
void catch_exception_58 (void);
void catch_exception_59 (void);
void catch_exception_60 (void);
void catch_exception_61 (void);
void catch_exception_62 (void);
void catch_exception_63 (void);
void catch_exception_64 (void);
void catch_exception_65 (void);
void catch_exception_66 (void);
void catch_exception_67 (void);
void catch_exception_68 (void);
void catch_exception_69 (void);
void catch_exception_70 (void);
void catch_exception_71 (void);
void catch_exception_72 (void);
void catch_exception_73 (void);
void catch_exception_74 (void);
void catch_exception_75 (void);
void catch_exception_76 (void);
void catch_exception_77 (void);
void catch_exception_78 (void);
void catch_exception_79 (void);
void catch_exception_80 (void);
void catch_exception_81 (void);
void catch_exception_82 (void);
void catch_exception_83 (void);
void catch_exception_84 (void);
void catch_exception_85 (void);
void catch_exception_86 (void);
void catch_exception_87 (void);
void catch_exception_88 (void);
void catch_exception_89 (void);
void catch_exception_90 (void);
void catch_exception_91 (void);
void catch_exception_92 (void);
void catch_exception_93 (void);
void catch_exception_94 (void);
void catch_exception_95 (void);
void catch_exception_96 (void);
void catch_exception_97 (void);
void catch_exception_98 (void);
void catch_exception_99 (void);
void catch_exception_100 (void);
void catch_exception_101 (void);
void catch_exception_102 (void);
void catch_exception_103 (void);
void catch_exception_104 (void);
void catch_exception_105 (void);
void catch_exception_106 (void);
void catch_exception_107 (void);
void catch_exception_108 (void);
void catch_exception_109 (void);
void catch_exception_110 (void);
void catch_exception_111 (void);
void catch_exception_112 (void);
void catch_exception_113 (void);
void catch_exception_114 (void);
void catch_exception_115 (void);
void catch_exception_116 (void);
void catch_exception_117 (void);
void catch_exception_118 (void);
void catch_exception_119 (void);
void catch_exception_120 (void);
void catch_exception_121 (void);
void catch_exception_122 (void);
void catch_exception_123 (void);
void catch_exception_124 (void);
void catch_exception_125 (void);
void catch_exception_126 (void);
void catch_exception_127 (void);
void breakpoint (void);
#define init_stack_size 2*1024 /* if you change this you should also modify BINIT */
#define stub_stack_size 2*1024
int init_stack[init_stack_size] __attribute__ ((section ("stack"))) = {0};
int stub_stack[stub_stack_size] __attribute__ ((section ("stack"))) = {0};
void INIT ();
void start ();
#define CPU_BUS_ERROR_VEC 9
#define DMA_BUS_ERROR_VEC 10
#define NMI_VEC 11
#define INVALID_INSN_VEC 4
#define INVALID_SLOT_VEC 6
#define TRAP_VEC 32
#define IO_VEC 33
#define USER_VEC 127
char in_nmi; /* Set when handling an NMI, so we don't reenter */
int dofault; /* Non zero, bus errors will raise exception */
int *stub_sp;
/* debug > 0 prints ill-formed commands in valid packets & checksum errors */
int remote_debug;
/* jump buffer used for setjmp/longjmp */
jmp_buf remcomEnv;
enum regnames
{
R0, R1, R2, R3, R4, R5, R6, R7,
R8, R9, R10, R11, R12, R13, R14,
R15, PC, PR, GBR, VBR, MACH, MACL, SR,
TICKS, STALLS, CYCLES, INSTS, PLR
};
typedef struct
{
short *memAddr;
short oldInstr;
}
stepData;
int registers[NUMREGBYTES / 4];
stepData instrBuffer;
char stepped;
static const char hexchars[] = "0123456789abcdef";
static char remcomInBuffer[BUFMAX];
static char remcomOutBuffer[BUFMAX];
void blink(void)
{
while(1)
{
int i;
PBDR ^= 0x40; /* toggle PB6 */
for(i = 0;i < 500000;i++)
{
}
}
}
char highhex(int x)
{
return hexchars[(x >> 4) & 0xf];
}
char lowhex(int x)
{
return hexchars[x & 0xf];
}
/*
* Assembly macros
*/
#define BREAKPOINT() asm("trapa #0x20"::);
/*
* Routines to handle hex data
*/
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);
}
/* convert the memory, pointed to by mem into hex, placing result in buf */
/* return a pointer to the last char put in buf (null) */
static char *mem2hex (char *mem, char *buf, int count)
{
int i;
int ch;
for (i = 0; i < count; i++)
{
ch = *mem++;
*buf++ = highhex (ch);
*buf++ = lowhex (ch);
}
*buf = 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 (char *buf, char *mem, int count)
{
int i;
unsigned char ch;
for (i = 0; i < count; i++)
{
ch = hex (*buf++) << 4;
ch = ch + hex (*buf++);
*mem++ = ch;
}
return (mem);
}
/**********************************************/
/* WHILE WE FIND NICE HEX CHARS, BUILD AN INT */
/* RETURN NUMBER OF CHARS PROCESSED */
/**********************************************/
static int hex2int (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);
}
/*
* Routines to get and put packets
*/
/* scan for the sequence $<data>#<checksum> */
unsigned char *getpacket (void)
{
unsigned char *buffer = &remcomInBuffer[0];
unsigned char checksum;
unsigned char xmitcsum;
int count;
char ch;
while (1)
{
/* wait around for the start character, ignore all other characters */
while ((ch = serial_getc ()) != '$')
;
retry:
checksum = 0;
xmitcsum = -1;
count = 0;
/* now, read until a # or end of buffer is found */
while (count < BUFMAX)
{
ch = serial_getc ();
if (ch == '$')
goto retry;
if (ch == '#')
break;
checksum = checksum + ch;
buffer[count] = ch;
count = count + 1;
}
buffer[count] = 0;
if (ch == '#')
{
ch = serial_getc ();
xmitcsum = hex (ch) << 4;
ch = serial_getc ();
xmitcsum += hex (ch);
if (checksum != xmitcsum)
{
serial_putc ('-'); /* failed checksum */
}
else
{
serial_putc ('+'); /* successful transfer */
/* if a sequence char is present, reply the sequence ID */
if (buffer[2] == ':')
{
serial_putc (buffer[0]);
serial_putc (buffer[1]);
return &buffer[3];
}
return &buffer[0];
}
}
}
}
/* send the packet in buffer. */
static void putpacket (register char *buffer)
{
register int checksum;
/* $<packet info>#<checksum>. */
do
{
char *src = buffer;
serial_putc ('$');
checksum = 0;
while (*src)
{
int runlen;
/* Do run length encoding */
for (runlen = 0; runlen < 100; runlen ++)
{
if (src[0] != src[runlen])
{
if (runlen > 3)
{
int encode;
/* Got a useful amount */
serial_putc (*src);
checksum += *src;
serial_putc ('*');
checksum += '*';
checksum += (encode = runlen + ' ' - 4);
serial_putc (encode);
src += runlen;
}
else
{
serial_putc (*src);
checksum += *src;
src++;
}
break;
}
}
}
serial_putc ('#');
serial_putc (highhex(checksum));
serial_putc (lowhex(checksum));
}
while (serial_getc() != '+');
}
/* a bus error has occurred, perform a longjmp
to return execution and allow handling of the error */
void handle_buserror (void)
{
longjmp (remcomEnv, 1);
}
/*
* this function takes the SH-1 exception number and attempts to
* translate this number into a unix compatible signal value
*/
static int computeSignal (int exceptionVector)
{
int sigval;
switch (exceptionVector)
{
case INVALID_INSN_VEC:
sigval = SIGILL;
break;
case INVALID_SLOT_VEC:
sigval = SIGILL;
break;
case CPU_BUS_ERROR_VEC:
sigval = SIGBUS;
break;
case DMA_BUS_ERROR_VEC:
sigval = SIGBUS;
break;
case NMI_VEC:
sigval = SIGINT;
break;
case TRAP_VEC:
case USER_VEC:
sigval = SIGTRAP;
break;
default:
sigval = SIGEMT; /* "software generated"*/
break;
}
return (sigval);
}
void doSStep (void)
{
short *instrMem;
int displacement;
int reg;
unsigned short opcode;
instrMem = (short *) registers[PC];
opcode = *instrMem;
stepped = 1;
if ((opcode & COND_BR_MASK) == BT_INSTR)
{
if (registers[SR] & T_BIT_MASK)
{
displacement = (opcode & COND_DISP) << 1;
if (displacement & 0x80)
displacement |= 0xffffff00;
/*
* Remember PC points to second instr.
* after PC of branch ... so add 4
*/
instrMem = (short *) (registers[PC] + displacement + 4);
}
else
instrMem += 1;
}
else if ((opcode & COND_BR_MASK) == BF_INSTR)
{
if (registers[SR] & T_BIT_MASK)
instrMem += 1;
else
{
displacement = (opcode & COND_DISP) << 1;
if (displacement & 0x80)
displacement |= 0xffffff00;
/*
* Remember PC points to second instr.
* after PC of branch ... so add 4
*/
instrMem = (short *) (registers[PC] + displacement + 4);
}
}
else if ((opcode & UCOND_DBR_MASK) == BRA_INSTR)
{
displacement = (opcode & UCOND_DISP) << 1;
if (displacement & 0x0800)
displacement |= 0xfffff000;
/*
* Remember PC points to second instr.
* after PC of branch ... so add 4
*/
instrMem = (short *) (registers[PC] + displacement + 4);
}
else if ((opcode & UCOND_RBR_MASK) == JSR_INSTR)
{
reg = (char) ((opcode & UCOND_REG) >> 8);
instrMem = (short *) registers[reg];
}
else if (opcode == RTS_INSTR)
instrMem = (short *) registers[PR];
else if (opcode == RTE_INSTR)
instrMem = (short *) registers[15];
else if ((opcode & TRAPA_MASK) == TRAPA_INSTR)
instrMem = (short *) ((opcode & ~TRAPA_MASK) << 2);
else
instrMem += 1;
instrBuffer.memAddr = instrMem;
instrBuffer.oldInstr = *instrMem;
*instrMem = SSTEP_INSTR;
}
/* Undo the effect of a previous doSStep. If we single stepped,
restore the old instruction. */
void undoSStep (void)
{
if (stepped)
{
short *instrMem;
instrMem = instrBuffer.memAddr;
*instrMem = instrBuffer.oldInstr;
}
stepped = 0;
}
/*
* This function does all exception handling. It only does two things -
* it figures out why it was called and tells gdb, and then it reacts
* to gdb's requests.
*
*/
void gdb_handle_exception (int exceptionVector)
{
int sigval, stepping;
int addr, length;
char *ptr;
/* reply to host that an exception has occurred */
sigval = computeSignal (exceptionVector);
remcomOutBuffer[0] = 'S';
remcomOutBuffer[1] = highhex(sigval);
remcomOutBuffer[2] = lowhex (sigval);
remcomOutBuffer[3] = 0;
putpacket (remcomOutBuffer);
/*
* exception 127 indicates a software trap
* inserted in place of code ... so back up
* PC by one instruction, since this instruction
* will later be replaced by its original one!
*/
if (exceptionVector == USER_VEC
|| exceptionVector == TRAP_VEC)
registers[PC] -= 2;
/*
* Do the things needed to undo
* any stepping we may have done!
*/
undoSStep ();
stepping = 0;
while (1)
{
remcomOutBuffer[0] = 0;
ptr = getpacket ();
switch (*ptr++)
{
case '?':
remcomOutBuffer[0] = 'S';
remcomOutBuffer[1] = highhex (sigval);
remcomOutBuffer[2] = lowhex (sigval);
remcomOutBuffer[3] = 0;
break;
case 'd':
remote_debug = !(remote_debug); /* toggle debug flag */
break;
case 'g': /* return the value of the CPU registers */
mem2hex ((char *) registers, remcomOutBuffer, NUMREGBYTES);
break;
case 'G': /* set the value of the CPU registers - return OK */
hex2mem (ptr, (char *) registers, NUMREGBYTES);
strcpy (remcomOutBuffer, "OK");
break;
/* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
case 'm':
if (setjmp (remcomEnv) == 0)
{
dofault = 0;
/* TRY, TO READ %x,%x. IF SUCCEED, SET PTR = 0 */
if (hex2int (&ptr, &addr))
if (*(ptr++) == ',')
if (hex2int (&ptr, &length))
{
ptr = 0;
mem2hex ((char *) addr, remcomOutBuffer, length);
}
if (ptr)
strcpy (remcomOutBuffer, "E01");
}
else
strcpy (remcomOutBuffer, "E03");
/* restore handler for bus error */
dofault = 1;
break;
/* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
case 'M':
if (setjmp (remcomEnv) == 0)
{
dofault = 0;
/* TRY, TO READ '%x,%x:'. IF SUCCEED, SET PTR = 0 */
if (hex2int (&ptr, &addr))
if (*(ptr++) == ',')
if (hex2int (&ptr, &length))
if (*(ptr++) == ':')
{
hex2mem (ptr, (char *) addr, length);
ptr = 0;
strcpy (remcomOutBuffer, "OK");
}
if (ptr)
strcpy (remcomOutBuffer, "E02");
}
else
strcpy (remcomOutBuffer, "E03");
/* restore handler for bus error */
dofault = 1;
break;
/* cAA..AA Continue at address AA..AA(optional) */
/* sAA..AA Step one instruction from AA..AA(optional) */
case 's':
stepping = 1;
case 'c':
{
/* tRY, to read optional parameter, pc unchanged if no parm */
if (hex2int (&ptr, &addr))
registers[PC] = addr;
if (stepping)
doSStep ();
}
return;
break;
/* kill the program */
case 'k': /* do nothing */
break;
default:
break;
} /* switch */
/* reply to the request */
putpacket (remcomOutBuffer);
}
}
/* We've had an exception - go into the gdb stub */
void handle_exception(int exceptionVector)
{
gdb_handle_exception (exceptionVector);
}
/* 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)
{
BREAKPOINT ();
}
/**** Processor-specific routines start here ****/
/**** Processor-specific routines start here ****/
/**** Processor-specific routines start here ****/
/* SH1/SH2 exception vector table format */
typedef struct
{
void (*func_cold) ();
int *stack_cold;
void (*func_warm) ();
int *stack_warm;
void (*(handler[128 - 4])) ();
} vec_type;
/* vectable is the SH1/SH2 vector table. It must be at address 0
** or wherever your vbr points.
** Note that we only define the first 128 vectors, since the Jukebox
** firmware has its entry point at 0x200
*/
const vec_type vectable __attribute__ ((section (".vectors"))) =
{
&start, /* 0: Power-on reset PC */
init_stack + init_stack_size, /* 1: Power-on reset SP */
&start, /* 2: Manual reset PC */
init_stack + init_stack_size, /* 3: Manual reset SP */
{
&catch_exception_4, /* 4: General invalid instruction */
&catch_exception_5, /* 5: Reserved for system */
&catch_exception_6, /* 6: Invalid slot instruction */
&catch_exception_7, /* 7: Reserved for system */
&catch_exception_8, /* 8: Reserved for system */
&catch_exception_9, /* 9: CPU bus error */
&catch_exception_10, /* 10: DMA bus error */
&catch_exception_11, /* 11: NMI */
&catch_exception_12, /* 12: User break */
&catch_exception_13, /* 13: Reserved for system */
&catch_exception_14, /* 14: Reserved for system */
&catch_exception_15, /* 15: Reserved for system */
&catch_exception_16, /* 16: Reserved for system */
&catch_exception_17, /* 17: Reserved for system */
&catch_exception_18, /* 18: Reserved for system */
&catch_exception_19, /* 19: Reserved for system */
&catch_exception_20, /* 20: Reserved for system */
&catch_exception_21, /* 21: Reserved for system */
&catch_exception_22, /* 22: Reserved for system */
&catch_exception_23, /* 23: Reserved for system */
&catch_exception_24, /* 24: Reserved for system */
&catch_exception_25, /* 25: Reserved for system */
&catch_exception_26, /* 26: Reserved for system */
&catch_exception_27, /* 27: Reserved for system */
&catch_exception_28, /* 28: Reserved for system */
&catch_exception_29, /* 29: Reserved for system */
&catch_exception_30, /* 30: Reserved for system */
&catch_exception_31, /* 31: Reserved for system */
&catch_exception_32, /* 32: Trap instr (user vectors) */
&catch_exception_33, /* 33: Trap instr (user vectors) */
&catch_exception_34, /* 34: Trap instr (user vectors) */
&catch_exception_35, /* 35: Trap instr (user vectors) */
&catch_exception_36, /* 36: Trap instr (user vectors) */
&catch_exception_37, /* 37: Trap instr (user vectors) */
&catch_exception_38, /* 38: Trap instr (user vectors) */
&catch_exception_39, /* 39: Trap instr (user vectors) */
&catch_exception_40, /* 40: Trap instr (user vectors) */
&catch_exception_41, /* 41: Trap instr (user vectors) */
&catch_exception_42, /* 42: Trap instr (user vectors) */
&catch_exception_43, /* 43: Trap instr (user vectors) */
&catch_exception_44, /* 44: Trap instr (user vectors) */
&catch_exception_45, /* 45: Trap instr (user vectors) */
&catch_exception_46, /* 46: Trap instr (user vectors) */
&catch_exception_47, /* 47: Trap instr (user vectors) */
&catch_exception_48, /* 48: Trap instr (user vectors) */
&catch_exception_49, /* 49: Trap instr (user vectors) */
&catch_exception_50, /* 50: Trap instr (user vectors) */
&catch_exception_51, /* 51: Trap instr (user vectors) */
&catch_exception_52, /* 52: Trap instr (user vectors) */
&catch_exception_53, /* 53: Trap instr (user vectors) */
&catch_exception_54, /* 54: Trap instr (user vectors) */
&catch_exception_55, /* 55: Trap instr (user vectors) */
&catch_exception_56, /* 56: Trap instr (user vectors) */
&catch_exception_57, /* 57: Trap instr (user vectors) */
&catch_exception_58, /* 58: Trap instr (user vectors) */
&catch_exception_59, /* 59: Trap instr (user vectors) */
&catch_exception_60, /* 60: Trap instr (user vectors) */
&catch_exception_61, /* 61: Trap instr (user vectors) */
&catch_exception_62, /* 62: Trap instr (user vectors) */
&catch_exception_63, /* 63: Trap instr (user vectors) */
&catch_exception_64, /* 64: IRQ0 */
&catch_exception_65, /* 65: IRQ1 */
&catch_exception_66, /* 66: IRQ2 */
&catch_exception_67, /* 67: IRQ3 */
&catch_exception_68, /* 68: IRQ4 */
&catch_exception_69, /* 69: IRQ5 */
&catch_exception_70, /* 70: IRQ6 */
&catch_exception_71, /* 71: IRQ7 */
&catch_exception_72,
&catch_exception_73,
&catch_exception_74,
&catch_exception_75,
&catch_exception_76,
&catch_exception_77,
&catch_exception_78,
&catch_exception_79,
&catch_exception_80,
&catch_exception_81,
&catch_exception_82,
&catch_exception_83,
&catch_exception_84,
&catch_exception_85,
&catch_exception_86,
&catch_exception_87,
&catch_exception_88,
&catch_exception_89,
&catch_exception_90,
&catch_exception_91,
&catch_exception_92,
&catch_exception_93,
&catch_exception_94,
&catch_exception_95,
&catch_exception_96,
&catch_exception_97,
&catch_exception_98,
&catch_exception_99,
&catch_exception_100,
&catch_exception_101,
&catch_exception_102,
&catch_exception_103,
&catch_exception_104,
&catch_exception_105,
&catch_exception_106,
&catch_exception_107,
&catch_exception_108,
&catch_exception_109,
&catch_exception_110,
&catch_exception_111,
&catch_exception_112,
&catch_exception_113,
&catch_exception_114,
&catch_exception_115,
&catch_exception_116,
&catch_exception_117,
&catch_exception_118,
&catch_exception_119,
&catch_exception_120,
&catch_exception_121,
&catch_exception_122,
&catch_exception_123,
&catch_exception_124,
&catch_exception_125,
&catch_exception_126,
&catch_exception_127}};
void INIT (void)
{
/* Disable all timer interrupts */
TIER0 = 0;
TIER1 = 0;
TIER2 = 0;
TIER3 = 0;
TIER4 = 0;
init_serial();
in_nmi = 0;
dofault = 1;
stepped = 0;
stub_sp = stub_stack + stub_stack_size;
breakpoint ();
/* We should never come here */
blink();
}
void sr()
{
/* Calling Reset does the same as pressing the button */
asm (".global _Reset\n"
" .global _WarmReset\n"
"_Reset:\n"
"_WarmReset:\n"
" mov.l L_sp,r15\n"
" bra _INIT\n"
" nop\n"
" .align 2\n"
"L_sp: .long _init_stack + 8000");
asm("saveRegisters:\n");
asm(" mov.l @(L_reg, pc), r0\n"
" mov.l @r15+, r1 ! pop R0\n"
" mov.l r2, @(0x08, r0) ! save R2\n"
" mov.l r1, @r0 ! save R0\n"
" mov.l @r15+, r1 ! pop R1\n"
" mov.l r3, @(0x0c, r0) ! save R3\n"
" mov.l r1, @(0x04, r0) ! save R1\n"
" mov.l r4, @(0x10, r0) ! save R4\n"
" mov.l r5, @(0x14, r0) ! save R5\n"
" mov.l r6, @(0x18, r0) ! save R6\n"
" mov.l r7, @(0x1c, r0) ! save R7\n"
" mov.l r8, @(0x20, r0) ! save R8\n"
" mov.l r9, @(0x24, r0) ! save R9\n"
" mov.l r10, @(0x28, r0) ! save R10\n"
" mov.l r11, @(0x2c, r0) ! save R11\n"
" mov.l r12, @(0x30, r0) ! save R12\n"
" mov.l r13, @(0x34, r0) ! save R13\n"
" mov.l r14, @(0x38, r0) ! save R14\n"
" mov.l @r15+, r4 ! save arg to handleException\n"
" add #8, r15 ! hide PC/SR values on stack\n"
" mov.l r15, @(0x3c, r0) ! save R15\n"
" add #-8, r15 ! save still needs old SP value\n"
" add #92, r0 ! readjust register pointer\n"
" mov r15, r2\n"
" add #4, r2\n"
" mov.l @r2, r2 ! R2 has SR\n"
" mov.l @r15, r1 ! R1 has PC\n"
" mov.l r2, @-r0 ! save SR\n"
" sts.l macl, @-r0 ! save MACL\n"
" sts.l mach, @-r0 ! save MACH\n"
" stc.l vbr, @-r0 ! save VBR\n"
" stc.l gbr, @-r0 ! save GBR\n"
" sts.l pr, @-r0 ! save PR\n"
" mov.l @(L_stubstack, pc), r2\n"
" mov.l @(L_hdl_except, pc), r3\n"
" mov.l @r2, r15\n"
" jsr @r3\n"
" mov.l r1, @-r0 ! save PC\n"
" mov.l @(L_stubstack, pc), r0\n"
" mov.l @(L_reg, pc), r1\n"
" bra restoreRegisters\n"
" mov.l r15, @r0 ! save __stub_stack\n"
" .align 2\n"
"L_reg:\n"
" .long _registers\n"
"L_stubstack:\n"
" .long _stub_sp\n"
"L_hdl_except:\n"
" .long _handle_exception");
}
void rr()
{
asm(" .align 2 \n"
" .global _resume\n"
"_resume:\n"
" mov r4,r1\n"
"restoreRegisters:\n"
" add #8, r1 ! skip to R2\n"
" mov.l @r1+, r2 ! restore R2\n"
" mov.l @r1+, r3 ! restore R3\n"
" mov.l @r1+, r4 ! restore R4\n"
" mov.l @r1+, r5 ! restore R5\n"
" mov.l @r1+, r6 ! restore R6\n"
" mov.l @r1+, r7 ! restore R7\n"
" mov.l @r1+, r8 ! restore R8\n"
" mov.l @r1+, r9 ! restore R9\n"
" mov.l @r1+, r10 ! restore R10\n"
" mov.l @r1+, r11 ! restore R11\n"
" mov.l @r1+, r12 ! restore R12\n"
" mov.l @r1+, r13 ! restore R13\n"
" mov.l @r1+, r14 ! restore R14\n"
" mov.l @r1+, r15 ! restore programs stack\n"
" mov.l @r1+, r0\n"
" add #-8, r15 ! uncover PC/SR on stack \n"
" mov.l r0, @r15 ! restore PC onto stack\n"
" lds.l @r1+, pr ! restore PR\n"
" ldc.l @r1+, gbr ! restore GBR\n"
" ldc.l @r1+, vbr ! restore VBR\n"
" lds.l @r1+, mach ! restore MACH\n"
" lds.l @r1+, macl ! restore MACL\n"
" mov.l @r1, r0 \n"
" add #-88, r1 ! readjust reg pointer to R1\n"
" mov.l r0, @(4, r15) ! restore SR onto stack+4\n"
" mov.l r2, @-r15\n"
" mov.l L_in_nmi, r0\n"
" mov #0, r2\n"
" mov.b r2, @r0\n"
" mov.l @r15+, r2\n"
" mov.l @r1+, r0 ! restore R0\n"
" rte\n"
" mov.l @r1, r1 ! restore R1");
}
static inline void code_for_catch_exception(unsigned int n)
{
asm(" .globl _catch_exception_%O0" : : "X" (n) );
asm(" _catch_exception_%O0:" :: "X" (n) );
asm(" add #-4, r15 ! reserve spot on stack ");
asm(" mov.l r1, @-r15 ! push R1 ");
if (n == NMI_VEC)
{
/* Special case for NMI - make sure that they don't nest */
asm(" mov.l r0, @-r15 ! push R0");
asm(" mov.l L_in_nmi, r0");
asm(" tas.b @r0 ! Fend off against addtnl NMIs");
asm(" bt noNMI");
asm(" mov.l @r15+, r0");
asm(" mov.l @r15+, r1");
asm(" add #4, r15");
asm(" rte");
asm(" nop");
asm(".align 2");
asm("L_in_nmi: .long _in_nmi");
asm("noNMI:");
}
else
{
if (n == CPU_BUS_ERROR_VEC)
{
/* Exception 9 (bus errors) are disasbleable - so that you
can probe memory and get zero instead of a fault.
Because the vector table may be in ROM we don't revector
the interrupt like all the other stubs, we check in here
*/
asm("mov.l L_dofault,r1");
asm("mov.l @r1,r1");
asm("tst r1,r1");
asm("bf faultaway");
asm("bsr _handle_buserror");
asm(".align 2");
asm("L_dofault: .long _dofault");
asm("faultaway:");
}
asm(" mov #15<<4, r1 ");
asm(" ldc r1, sr ! disable interrupts ");
asm(" mov.l r0, @-r15 ! push R0 ");
}
/* Prepare for saving context, we've already pushed r0 and r1, stick
exception number into the frame */
asm(" mov r15, r0 ");
asm(" add #8, r0 ");
asm(" mov %0,r1" :: "X" (n));
asm(" extu.b r1,r1 ");
asm(" bra saveRegisters ! save register values ");
asm(" mov.l r1, @r0 ! save exception # ");
}
/* Here we call all defined exceptions, so the inline assembler gets
generated */
void exceptions (void)
{
code_for_catch_exception (4);
code_for_catch_exception (5);
code_for_catch_exception (6);
code_for_catch_exception (7);
code_for_catch_exception (8);
code_for_catch_exception (9);
code_for_catch_exception (10);
code_for_catch_exception (11);
code_for_catch_exception (12);
code_for_catch_exception (13);
code_for_catch_exception (14);
code_for_catch_exception (15);
code_for_catch_exception (16);
code_for_catch_exception (17);
code_for_catch_exception (18);
code_for_catch_exception (19);
code_for_catch_exception (20);
code_for_catch_exception (21);
code_for_catch_exception (22);
code_for_catch_exception (23);
code_for_catch_exception (24);
code_for_catch_exception (25);
code_for_catch_exception (26);
code_for_catch_exception (27);
code_for_catch_exception (28);
code_for_catch_exception (29);
code_for_catch_exception (30);
code_for_catch_exception (31);
code_for_catch_exception (32);
code_for_catch_exception (33);
code_for_catch_exception (34);
code_for_catch_exception (35);
code_for_catch_exception (36);
code_for_catch_exception (37);
code_for_catch_exception (38);
code_for_catch_exception (39);
code_for_catch_exception (40);
code_for_catch_exception (41);
code_for_catch_exception (42);
code_for_catch_exception (43);
code_for_catch_exception (44);
code_for_catch_exception (45);
code_for_catch_exception (46);
code_for_catch_exception (47);
code_for_catch_exception (48);
code_for_catch_exception (49);
code_for_catch_exception (50);
code_for_catch_exception (51);
code_for_catch_exception (52);
code_for_catch_exception (53);
code_for_catch_exception (54);
code_for_catch_exception (55);
code_for_catch_exception (56);
code_for_catch_exception (57);
code_for_catch_exception (58);
code_for_catch_exception (59);
code_for_catch_exception (60);
code_for_catch_exception (61);
code_for_catch_exception (62);
code_for_catch_exception (63);
code_for_catch_exception (64);
code_for_catch_exception (65);
code_for_catch_exception (66);
code_for_catch_exception (67);
code_for_catch_exception (68);
code_for_catch_exception (69);
code_for_catch_exception (70);
code_for_catch_exception (71);
code_for_catch_exception (72);
code_for_catch_exception (73);
code_for_catch_exception (74);
code_for_catch_exception (75);
code_for_catch_exception (76);
code_for_catch_exception (77);
code_for_catch_exception (78);
code_for_catch_exception (79);
code_for_catch_exception (80);
code_for_catch_exception (81);
code_for_catch_exception (82);
code_for_catch_exception (83);
code_for_catch_exception (84);
code_for_catch_exception (85);
code_for_catch_exception (86);
code_for_catch_exception (87);
code_for_catch_exception (88);
code_for_catch_exception (89);
code_for_catch_exception (90);
code_for_catch_exception (91);
code_for_catch_exception (92);
code_for_catch_exception (93);
code_for_catch_exception (94);
code_for_catch_exception (95);
code_for_catch_exception (96);
code_for_catch_exception (97);
code_for_catch_exception (98);
code_for_catch_exception (99);
code_for_catch_exception (100);
code_for_catch_exception (101);
code_for_catch_exception (102);
code_for_catch_exception (103);
code_for_catch_exception (104);
code_for_catch_exception (105);
code_for_catch_exception (106);
code_for_catch_exception (107);
code_for_catch_exception (108);
code_for_catch_exception (109);
code_for_catch_exception (110);
code_for_catch_exception (111);
code_for_catch_exception (112);
code_for_catch_exception (113);
code_for_catch_exception (114);
code_for_catch_exception (115);
code_for_catch_exception (116);
code_for_catch_exception (117);
code_for_catch_exception (118);
code_for_catch_exception (119);
code_for_catch_exception (120);
code_for_catch_exception (121);
code_for_catch_exception (122);
code_for_catch_exception (123);
code_for_catch_exception (124);
code_for_catch_exception (125);
code_for_catch_exception (126);
code_for_catch_exception (127);
}
/*
* Port B Control Register (PBCR1)
*/
#define PB15MD1 0x8000
#define PB15MD0 0x4000
#define PB14MD1 0x2000
#define PB14MD0 0x1000
#define PB13MD1 0x0800
#define PB13MD0 0x0400
#define PB12MD1 0x0200
#define PB12MD0 0x0100
#define PB11MD1 0x0080
#define PB11MD0 0x0040
#define PB10MD1 0x0020
#define PB10MD0 0x0010
#define PB9MD1 0x0008
#define PB9MD0 0x0004
#define PB8MD1 0x0002
#define PB8MD0 0x0001
#define PB15MD PB15MD1|PB14MD0
#define PB14MD PB14MD1|PB14MD0
#define PB13MD PB13MD1|PB13MD0
#define PB12MD PB12MD1|PB12MD0
#define PB11MD PB11MD1|PB11MD0
#define PB10MD PB10MD1|PB10MD0
#define PB9MD PB9MD1|PB9MD0
#define PB8MD PB8MD1|PB8MD0
#define PB_TXD1 PB11MD1
#define PB_RXD1 PB10MD1
#define PB_TXD0 PB9MD1
#define PB_RXD0 PB8MD1
#define PB7MD PB7MD1|PB7MD0
#define PB6MD PB6MD1|PB6MD0
#define PB5MD PB5MD1|PB5MD0
#define PB4MD PB4MD1|PB4MD0
#define PB3MD PB3MD1|PB3MD0
#define PB2MD PB2MD1|PB2MD0
#define PB1MD PB1MD1|PB1MD0
#define PB0MD PB0MD1|PB0MD0
void handleError (char theSSR);
void nop (void)
{
}
void init_serial (void)
{
int i;
/* Clear Channel 1's SCR */
SCR1 = 0;
/* Set communication to be async, 8-bit data,
no parity, 1 stop bit and use internal clock */
SMR1 = 0;
/* BRR1 = SYSCLOCK / (9600 * 32) - 1;*/
BRR1 = 9; /* 38400 */
SCR1 &= ~(SCI_CKE1 | SCI_CKE0);
/* let the hardware settle */
for (i = 0; i < 1000; i++)
nop ();
/* Turn on in and out */
SCR1 |= SCI_RE | SCI_TE;
/* Set the PFC to make RXD1 (pin PB8) an input pin
and TXD1 (pin PB9) an output pin */
PBCR1 &= ~(PB_TXD1 | PB_RXD1);
PBCR1 |= PB_TXD1 | PB_RXD1;
}
int serial_waitc(void)
{
char mySSR;
mySSR = SSR1 & ( SCI_PER | SCI_FER | SCI_ORER );
if ( mySSR )
handleError ( mySSR );
return SSR1 & SCI_RDRF ;
}
char serial_getc (void)
{
char ch;
char mySSR;
while ( ! serial_waitc())
;
ch = RDR1;
SSR1 &= ~SCI_RDRF;
mySSR = SSR1 & (SCI_PER | SCI_FER | SCI_ORER);
if (mySSR)
handleError (mySSR);
return ch;
}
void serial_putc (char ch)
{
while (!(SSR1 & SCI_TDRE))
{
;
}
/*
* Write data into TDR and clear TDRE
*/
TDR1 = ch;
SSR1 &= ~SCI_TDRE;
}
void handleError (char theSSR)
{
/* Clear all error bits, otherwise the receiver will stop */
SSR1 &= ~(SCI_ORER | SCI_PER | SCI_FER);
}
Reference in a new issue View git blame Copy permalink