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Hi, I am debugging an LPC2106 using arm-elf-insight with a WIGGLER and cannot get the software interrupt to work correctly. I am running from RAM and can successfully step through the code, but have a problem with the SWI instruction. I have setup the vector table at 0x40000000 as follows: (gdb) disassemble 0x40000000 0x40000020 Dump of assembler code from 0x40000000 to 0x40000020: 0x40000000 <$a+0>: b 0x40002438 <start> 0x40000004 <$a+4>: b 0x400024a0 <endless_loop> 0x40000008 <$a+8>: b 0x40001480 <SWI_Handler> 0x4000000c <$a+12>:b 0x400024a0 <endless_loop> 0x40000010 <$a+16>:b 0x400024a0 <endless_loop> 0x40000014 <$a+20>:b 0x400024a0 <endless_loop> 0x40000018 <$a+24>:b 0x400024a0 <endless_loop> 0x4000001c <$a+28>:b 0x400024a0 <endless_loop> I have also set the MEMMAP register to 2, which I think should remap the vector table from flash to RAM. The vector table in flash is as follows - I have not set this up it's just what was there: (gdb) disassemble 0 0x20 Dump of assembler code from 0x0 to 0x20: 0x00000000: ldr pc, [pc, #24] ; 0x20 0x00000004: ldr pc, [pc, #24] ; 0x24 0x00000008: ldr pc, [pc, #24] ; 0x28 0x0000000c: ldr pc, [pc, #24] ; 0x2c 0x00000010: ldr pc, [pc, #24] ; 0x30 0x00000014: nop (mov r0,r0) 0x00000018: ldr pc, [pc, #24] ; 0x38 0x0000001c: ldr pc, [pc, #24] ; 0x3c End of assembler dump. When the SWI instruction executes I can see the PC getting set to 8. My understanding is that with the MEMMAP instruction set to 2, the program should actually read from 0x40000008, but stepping through the next instruction shows that the vector table in flash is actually being used. Any help on this matter gratefully appreciated. What am I doing wrong? Regards, Richard. |
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Remap vectors to RAM and GDB debugging???
Started by ●June 22, 2004
Reply by ●June 23, 20042004-06-23
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> My understanding is that with the MEMMAP instruction set to 2, the > program should actually read from 0x40000008, but stepping through > the next instruction shows that the vector table in flash is actually > being used. Some progress - but still problems: Now I seem to use the correct vector, but the branch is to a truncated address. Instead of seeing a b 0x400014b4 instruction I see a b 0x14b4 instruction. The 0x40000000 offset has been lost. |
