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* Fixed the "qOffsets" return value. At least how I understand the

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documentation the segment offsets it shall return are relative to the
  address specified in the program header.
* Added "qSupported".
* Added the mandatory commands and some additional ones. Partially implemented
  only.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30038 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2009-04-08 16:54:57 +00:00
parent 7be389053f
commit 90d46a5c43
1 changed files with 44 additions and 31 deletions
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75
src/system/kernel/debug/gdb.cpp
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@ -18,6 +18,8 @@
#include <arch/debug_console.h>
#include <debug.h>
#include <elf.h>
#include <elf_priv.h>
#include <smp.h>
#include <vm.h>
@ -183,6 +185,14 @@ gdb_parse_command(void)
gdb_ack();
switch (sCommand[0]) {
case '?':
// command '?' is used for retrieving the signal
// that stopped the program. Fully implemeting
// this command requires help from the debugger,
// by now we just fake a SIGKILL
gdb_reply("S09"); /* SIGKILL = 9 */
break;
case 'H':
// Command H (actually Hct) is used to select
// the current thread (-1 meaning all threads)
@ -193,42 +203,28 @@ gdb_parse_command(void)
case 'q':
{
extern unsigned __data_start;
extern unsigned __bss_start;
// query commands
// There are several q commands:
//
// qXXXX Request info about XXXX.
// QXXXX=yyyy Set value of XXXX to yyyy.
// qOffsets Get segment offsets
//
// Currently we only support the 'qOffsets'
// form.
//
// *Note* that we actually have to lie,
// At first thought looks like we should
// return '_start', '__data_start' &
// '__bss_start', however gdb gets
// confused because the kernel link script
// pre-links at 0x80000000. To keep gdb
// gdb happy we just substract that amount.
if (strcmp(sCommand + 1, "Offsets") == 0) {
gdb_reply("Text=%x;Data=%x;Bss=%x", 0,
((unsigned)(&__data_start)) - 0x80000000,
((unsigned)(&__bss_start)) - 0x80000000);
if (strcmp(sCommand + 1, "Supported") == 0) {
// get the supported features
gdb_reply("");
} else if (strcmp(sCommand + 1, "Offsets") == 0) {
// get the segment offsets
elf_image_info* kernelImage = elf_get_kernel_image();
gdb_reply("Text=%lx;Data=%lx;Bss=%lx",
kernelImage->text_region.delta,
kernelImage->data_region.delta,
kernelImage->data_region.delta);
} else
gdb_reply("ENS");
gdb_reply("");
break;
}
case '?':
// command '?' is used for retrieving the signal
// that stopped the program. Fully implemeting
// this command requires help from the debugger,
// by now we just fake a SIGKILL
gdb_reply("S09"); /* SIGKILL = 9 */
break;
case 'c':
// continue at address
// TODO: Parse the address and resume there!
return QUIT;
case 'g':
{
@ -255,6 +251,13 @@ gdb_parse_command(void)
break;
}
case 'G':
// write registers
// TODO: Implement!
gdb_reply("E01");
break;
case 'm':
{
char* ptr;
@ -296,6 +299,10 @@ gdb_parse_command(void)
break;
}
case 'D':
// detach
return QUIT;
case 'k':
// Command 'k' actual semantics is 'kill the damn thing'.
// However gdb sends that command when you disconnect
@ -306,9 +313,15 @@ gdb_parse_command(void)
// kernel debugger command prompt.
return QUIT;
default:
case 's':
// "step" -- resume (?) at address
// TODO: Implement!
gdb_reply("E01");
break;
default:
gdb_reply("");
break;
}
return WAITACK;