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powerpc: Add 'show frame <addr>' to show an arbitrary trap frame

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This lets us print, for example, the user's trap frame when a panic occurs.
The frame address is given in the backtrace at the trap point, which can
then be passed to 'show frame'.  This is useful for debugging as it can show
inputs that lead to a panic or fault.  It can also be used to print trap
frames from other CPUs that get stuck.

i386 already has a similar command, but no others do.
This commit is contained in:
jhibbits 2019-12-01 21:29:34 +00:00
parent ba49434d93
commit 12b1f38c7c
1 changed files with 44 additions and 0 deletions
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44
sys/powerpc/powerpc/machdep.c
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@ -557,6 +557,50 @@ DB_SHOW_COMMAND(spr, db_show_spr)
db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno,
(unsigned long)spr);
}
DB_SHOW_COMMAND(frame, db_show_frame)
{
struct trapframe *tf;
long reg;
int i;
tf = have_addr ? (struct trapframe *)addr : curthread->td_frame;
/*
* Everything casts through long to simplify the printing.
* 'long' is native register size anyway.
*/
db_printf("trap frame %p\n", tf);
for (i = 0; i < nitems(tf->fixreg); i++) {
reg = tf->fixreg[i];
db_printf(" r%d:\t%#lx (%ld)\n", i, reg, reg);
}
reg = tf->lr;
db_printf(" lr:\t%#lx\n", reg);
reg = tf->cr;
db_printf(" cr:\t%#lx\n", reg);
reg = tf->xer;
db_printf(" xer:\t%#lx\n", reg);
reg = tf->ctr;
db_printf(" ctr:\t%#lx (%ld)\n", reg, reg);
reg = tf->srr0;
db_printf(" srr0:\t%#lx\n", reg);
reg = tf->srr1;
db_printf(" srr1:\t%#lx\n", reg);
reg = tf->exc;
db_printf(" exc:\t%#lx\n", reg);
reg = tf->dar;
db_printf(" dar:\t%#lx\n", reg);
#ifdef AIM
reg = tf->cpu.aim.dsisr;
db_printf(" dsisr:\t%#lx\n", reg);
#else
reg = tf->cpu.booke.esr;
db_printf(" esr:\t%#lx\n", reg);
reg = tf->cpu.booke.dbcr0;
db_printf(" dbcr0:\t%#lx\n", reg);
#endif
}
#endif
#undef bzero