sdcc/debugger
-SDCDB debugger
+SDCDB debugger - Development notes.
======================
-Notes April 23, 2003
+
+ddd - Notes from Martin Helmling, May 23, 2003
+========================
+
+Additionally following new commands work:
+
+ignore <breakpointnumber> <ignorecount> - ignore the breakpoint n times
+condition <breakpointnumber> <variable> <|>|<=|>=|==|!= <constant> - break condition
+commands - see gdb description -
+
+ddd - Notes from Martin Helmling, April 28, 2003
+========================
+
+To fullfill the requirements of 'ddd' ( Data Display Debugger ) to use it at
+graphical frontend to 'sdcdb' some new commands must be implemented.
+
+Now you can run the ddd with the commandline
+
+ddd -debugger 'sdcdb -cpu 8032 <file>'
+
+Following commands are additional implemented:
+
+1. execution:
+
+stepi - Step one instruction exactly using simulator 'step' command.
+nexti - Step one instruction, but proceed through subroutine calls using simulator 'next' command.
+break *<addr> - Set breakpoint at program address
+
+log examples:
+-> "stepi\n"
+<- "Simulator stopped at Address 0x0051\n"
+ "\032\032x.c:31:1:beg:0x00000051\n"
+ "(sdcdb) "
+-> "nexti\n"
+<- "Simulator stopped at Address 0x0055\n"
+ "\032\032x.c:33:1:beg:0x00000055\n"
+ "(sdcdb) "
+
+2. show machine code window:
+
+x /i - disassemble one asm command
+x disassemble asm commands
+
+log examples:
+-> "x /i 0x00000055\n"
+<- "0x00000055 <main+6>:\t\tmov\tr0,#_l\n"
+ "(sdcdb) "
+-> "disassemble 0x00000055\n"
+<- "Dump of assembler code for function main:\n"
+ "0x0000004f <main>:\t\tmov\tr0,#_ttt\n"
+ "0x00000051 <main+2>:\t\tmov\t@r0,#0x01\n"
+<- "0x00000053 <main+4>:\t\tmov\tr2,#0x09\n"
+ "0x00000055 <main+6>:\t\tmov\tr0,#_l\n"
+...
+ "0x000000c1 <main+114>:\t\tret\n"
+ "End of assembler dump.\n"
+ "(sdcdb) "
+-> "disassemble 0x40 0x45\n"
+<- "Dump of assembler code from 0x00000040 to 0x00000045:\n"
+ "0x00000040 <subfunc1+8>:\t\tinc\tr0\n"
+ "0x00000041 <subfunc1+9>:\t\tmov\t@r0,ar3\n"
+ "0x00000043 <subfunc1+11>:\t\tmov\ta,r3\n"
+ "0x00000044 <subfunc1+12>:\t\trlc\ta\n"
+ "0x00000045 <subfunc1+13>:\t\tsubb\ta,acc\n"
+ "End of assembler dump.\n"
+ "(sdcdb) "
+-> "break x.c:23\n"
+<- "Breakpoint 1 at 0x4b: file x.c, line 23.\n"
+ "(sdcdb) "
+-> "info breakpoints\n"
+<- "Num Type Disp Enb Address What\n"
+ "1 breakpoint keep y 0x0000004b at x.c:23\n"
+ "(sdcdb) "
+->
+
+3. show registers and stack
+
+frame - print information about the current Stack
+where - print stack
+up - Select and print stack frame that called this one
+down - Select and print stack frame that called this one
+info registers - show registers
+info all-registers - show also special these function registers,
+ which are symbolical defined.
+help <cmd> show short help for ddd tooltip info
+log examples:
+
+-> "where\n"
+<- "#0 0x0000004b in subfunc1 () at x.c:23\n"
+ "#1 0x0000004f in main () at x.c:31\n"
+ "(sdcdb) "
+-> "frame\n"
+<- "#0 0x0000004b in subfunc1 () at x.c:23\n"
+ "\032\032x.c:23:1:beg:0x0000004b\n"
+ "(sdcdb) "
+-> "up\n"
+<- "#1 0x0000004f in main () at x.c:31\n"
+ "\032\032x.c:31:1:beg:0x0000004f\n"
+ "(sdcdb) "
+-> "frame\n"
+<- "#1 0x0000004f in main () at x.c:31\n"
+ "\032\032x.c:31:1:beg:0x0000004f\n"
+ "(sdcdb) "
+-> "down\n"
+<- "#0 0x0000004b in subfunc1 () at x.c:23\n"
+ "\032\032x.c:23:1:beg:0x0000004b\n"
+ "(sdcdb) "
+-> "frame\n"
+<- "#0 0x0000004b in subfunc1 () at x.c:23\n"
+ "\032\032x.c:23:1:beg:0x0000004b\n"
+ "(sdcdb) "
+-> "info registers\n"
+<- "R0 : 0x87 135 .\n"
+ "R1 : 0x00 0 .\n"
+ "R2 : 0x05 5 .\n"
+ "R3 : 0x00 0 .\n"
+ "R4 : 0x00 0 .\n"
+ "R5 : 0x08 8 .\n"
+ "R6 : 0x00 0 .\n"
+ "ACC : 0x00 0 .\n"
+ "B : 0x00 0 .\n"
+ "DPTR: 0x0005 5\n"
+ "@DPTR: 0x00 0 .\n"
+ "PSW : 0x00 | CY : 0 | AC : 0 | OV : 0 | P : 0\n"
+ "(sdcdb) "
+# Showing all registers.
+-> "info all-registers\n"
+<- "R0 : 0x87 135 .\n"
+ "R1 : 0x00 0 .\n"
+ "R2 : 0x05 5 .\n"
+ "R3 : 0x00 0 .\n"
+ "R4 : 0x00 0 .\n"
+ "R5 : 0x08 8 .\n"
+ "R6 : 0x00 0 .\n"
+ "ACC : 0x00 0 .\n"
+ "B : 0x00 0 .\n"
+ "DPTR: 0x0005 5\n"
+ "@DPTR: 0x00 0 .\n"
+ "PSW : 0x00 | CY : 0 | AC : 0 | OV : 0 | P : 0\n"
+ "Special Function Registers:\n"
+<- "P0=0xff P0_0=1 P0_1=1 P0_2=1 P0_3=1\n"
+ "SP=0x13\n"
+ "(sdcdb) "
+-> "help step\n"
+<- "Step program until it reaches a different source line.\n"
+ "(sdcdb) "
+-> "help stepi\n"
+<- "Step one instruction exactly.\n"
+ "(sdcdb) "
+
+4. show and set variables:
+output [/<fmt>] <expr1> print value of <expr1> without newline for tooltip of ddd
+print [/<fmt>] <expr1> print value of <expr1> with newline
+display [/<fmt>] <expr1> print value of <expr1> every time the program is stopped
+ or 'display' command without args is used.
+
+set variable <expr1> = <value>
+
+
+<fmt> is the format for the basic type which is print out.
+If no format is set the default format is used.
+format is set by ddd 'x' as hex 'o' as octal, 'd' as dezimal and 't' as binary.
+
+<expr1> can by a variable , a array element , a structure element ( [] and . is parsed ).
+indices of arrays may be constants or variables.
+( dereference of pointers and casting today not implemented !! )
+
+log examples:
+code:
+
+typedef unsigned char uchar;
+idata long l;
+typedef struct _txstate
+{
+ uchar dstatus[4];
+ uchar avalue [8 ];
+} txstate_t;
+
+xdata txstate_t txstates[8];
+
+-> "output l\n"
+<- "5(sdcdb) "
+-> "display l\n"
+<- "(sdcdb) "
+-> "display /x l\n"
+<- "(sdcdb) "
+-> "display\n"
+<- "2: /x l = 0x00000005\n"
+ "1: l = 5\n"
+ "(sdcdb) "
+-> "display /o l\n"
+<- "(sdcdb) "
+-> "display\n"
+<- "3: /o l = 00000000005\n"
+ "2: /x l = 0x00000005\n"
+ "1: l = 5\n"
+ "(sdcdb) "
+-> "display /d l\n"
+<- "(sdcdb) "
+-> "display\n"
+<- "4: /d l = 5\n"
+ "3: /o l = 00000000005\n"
+ "2: /x l = 0x00000005\n"
+ "1: l = 5\n"
+ "(sdcdb) "
+-> "display /t l\n"
+<- "(sdcdb) "
+-> "display\n"
+<- "5: /t l = 00000000000000000000000000000101\n"
+ "4: /d l = 5\n"
+ "3: /o l = 00000000005\n"
+ "2: /x l = 0x00000005\n"
+ "1: l = 5\n"
+ "(sdcdb) "
+-> "output l\n"
+<- "5(sdcdb) "
+-> "print txstates\n"
+<- "$2 = { { dstatus = {\'\\1\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\2\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\0\',\'\\375\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\4\',\'\\0\',\'\\0\',\'\\0\',\
+'\\0\'}}, { dstatus = {\'\\0\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\'}},
+ { dstatus = {\'\\0\',\'\\0\',\'\\0\',\'\\0\'},
+ avalue = {\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\0\',\'\\
+0\'}}}\n"
+ "(sdcdb) "
+-> "print txstates[1].dstatus[1]\n"
+<- "$5 = \'\\2\'\n"
+ "(sdcdb) "
+-> "print /x txstates[1].dstatus[1]\n"
+<- "$7 = 0x02\n"
+-> "output txstates[1].dstatus[1]\n"
+<- "\'\\2\'(sdcdb) "
+-> "set variable txstates[1].dstatus[1] = 0x10\n"
+<- "(sdcdb) "
+-> "print /t txstates[1].dstatus[1]\n"
+<- "$9 = 00010000\n"
+-> "print /x txstates[1].dstatus[1]\n"
+<- "$10 = 0x10\n"
+
+-> "output l\n"
+<- "5(sdcdb) "
+-> "set variable l = 2\n"
+<- "(sdcdb) "
+-> "print l\n"
+<- "$15 = 2\n"
+-> "print /x txstates[l].dstatus[2]\n"
+<- "$16 = 0xfd\n"
+
+
+---------------------------------------------------
+
+Implementation Notes:
+
+IMEM and XMEM are cached to optimize the printaut of structures and arrays
+
+
+
+Notes April 23, 2003
+========================
Martin Helmling added support for ddd GUI debugger.
Code added to display assembly, set variables, and other commands
to interface to ddd.
Also sometimes not the correct breakpoints for stepping found in sdcdb.
I try to fix this tomorrow.
+Additional patches and notes from Martin(4-24-03):
+in the attachment you found three patches:
+debugpatch: Only for debugging, you can switch on and off the 4 different
+ debug and you can grep the debug by the prefix.
+signalpatch:Now the simulator stops if the user sends an interrupt
+ ( or 'ddd' ) and also the simulator does not die by another
+ user signal.
+
+sympatch: This is not a feature, THIS is the fix of a BUG !!!
+ In some circumstances in the *.cdb file the Symbol record
+ comes before the function record. So the symbol was
+ generated TWO TIMES in the symbol list. The L:G and L:XG
+
+ records then insert entry and exit address to the wrong
+ symbol. So before a new symbol is generated for the
+ function, a lookup in the symboltable is done.
+
+Example of a *.cdb:
+
+S:G$ZpuInitialize$0$0({2}DF,SV:S),C,0,0
+S:G$ZpuInitialize$0$0({2}DF,SV:S),C,0,0
+F:G$ZpuInitialize$0$0({2}DF,SV:S),Z,0,0,0,0,0
+S:LZpuInitialize$i$1$1({2}SI:S),R,0,0,[]
+L:G$ZpuInitialize$0$0:ADF
+L:XG$ZpuInitialize$0$0:BBB
Notes Feb 10, 2002 - Karl Bongers
+========================
SDCDB is a debugger for SDCC compiler. It works as a front
end to the ucSim simulator/disassembler program.
cmd.c:printSymValue(), where it can print variables relative
to the stack pointer.
+
projects / fw / sdcc / blobdiff