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kgdb: Remove first_entry for kgdb

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There are two ways to run into handle_exception, run command 'kgdb' and
encounter a breakpoint which triggers exception handling.

The origin source code only saves regs when first run command 'kgdb'.
Take the following for example, When run 'kgdb', regs is saved to entry_regs.
When run 'bootz', regs is not saved. However, if we set a breakpoint, then
continue. When breakpoint is reached, run `quit`, and Now return to the
instruction which follows kgdb, but not bootz.This may cause errors. So,
save regs for each handle_exception call to return to the correct place.
Example:
Target      |    Host
=>kgdb      |    (gdb)b bootz
            |    (gdb)c
=>bootz     |
            |    (gdb)Here stop because of breakpoint
            |    (gdb)q

Signed-off-by: Peng Fan <van.freenix@gmail.com>
This commit is contained in:
Peng Fan 2014-09-01 21:48:07 +08:00 committed by Tom Rini
parent f6c8f38ec6
commit f9f040b215
1 changed files with 2 additions and 12 deletions
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12
common/kgdb.c
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@ -103,7 +103,7 @@ static char remcomOutBuffer[BUFMAX];
static char remcomRegBuffer[BUFMAX];
static int initialized = 0;
static int kgdb_active = 0, first_entry = 1;
static int kgdb_active;
static struct pt_regs entry_regs;
static long error_jmp_buf[BUFMAX/2];
static int longjmp_on_fault = 0;
@ -348,16 +348,7 @@ handle_exception (struct pt_regs *regs)
kgdb_enter(regs, &kd);
if (first_entry) {
/*
* the first time we enter kgdb, we save the processor
* state so that we can return to the monitor if the
* remote end quits gdb (or at least, tells us to quit
* with the 'k' packet)
*/
entry_regs = *regs;
first_entry = 0;
}
ptr = remcomOutBuffer;
@ -459,7 +450,6 @@ handle_exception (struct pt_regs *regs)
case 'k': /* kill the program, actually return to monitor */
kd.extype = KGDBEXIT_KILL;
*regs = entry_regs;
first_entry = 1;
goto doexit;
case 'C': /* CSS continue with signal SS */