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- Use PC/RA/SP values as arguments for stacktrace_subr instead of trapframe.

Browse Source 
Context info could be obtained from other sources (see below) no only from
    td_pcb field
- Do not show a0..a3 values unless they're obtained from the stack. These
    are only confirmed values.
- Fix bt command in DDB. Previous implementation used thread's trapframe
    structure as a source info for trace unwinding, but this structure
    is filled only when exception occurs. Valid register values for sleeping
    processes are in pcb_context array. For curthread use pc/sp/ra for current
    frame
This commit is contained in:
Oleksandr Tymoshenko 2009-10-17 00:22:07 +00:00
parent 7dba4abc79
commit 4e6df32763
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/mips/; revision=198182
3 changed files with 73 additions and 43 deletions
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2
sys/mips/include/db_machdep.h
View File

@ -94,7 +94,7 @@ db_addr_t next_instr_address(db_addr_t, boolean_t);
int db_inst_type(int);
void db_dump_tlb(int, int);
db_addr_t branch_taken(int inst, db_addr_t pc);
void stacktrace_subr(db_regs_t *, int (*)(const char *, ...));
void stacktrace_subr(register_t pc, register_t sp, register_t ra, int (*)(const char *, ...));
int kdbpeek(int *);
#endif /* !_MIPS_DB_MACHDEP_H_ */

112
sys/mips/mips/db_trace.c
View File

@ -105,27 +105,31 @@ fn_name(uintptr_t addr)
}
void
stacktrace_subr(struct trapframe *regs, int (*printfn) (const char *,...))
stacktrace_subr(register_t pc, register_t sp, register_t ra,
int (*printfn) (const char *,...))
{
InstFmt i;
uintptr_t a0, a1, a2, a3, pc, sp, fp, ra, va, subr;
/*
* Arrays for a0..a3 registers and flags if content
* of these registers is valid, e.g. obtained from the stack
*/
int valid_args[4];
uintptr_t args[4];
uintptr_t va, subr;
unsigned instr, mask;
unsigned int frames = 0;
int more, stksize;
/* get initial values from the exception frame */
sp = regs->sp;
pc = regs->pc;
fp = regs->s8;
ra = regs->ra; /* May be a 'leaf' function */
a0 = regs->a0;
a1 = regs->a1;
a2 = regs->a2;
a3 = regs->a3;
int more, stksize, j;
/* Jump here when done with a frame, to start a new one */
loop:
/*
* Invalidate arguments values
*/
valid_args[0] = 0;
valid_args[1] = 0;
valid_args[2] = 0;
valid_args[3] = 0;
/* Jump here after a nonstandard (interrupt handler) frame */
stksize = 0;
subr = 0;
@ -265,23 +269,23 @@ stacktrace_subr(struct trapframe *regs, int (*printfn) (const char *,...))
mask |= (1 << i.IType.rt);
switch (i.IType.rt) {
case 4:/* a0 */
a0 = kdbpeek((int *)(sp + (short)i.IType.imm));
args[0] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[0] = 1;
break;
case 5:/* a1 */
a1 = kdbpeek((int *)(sp + (short)i.IType.imm));
args[1] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[1] = 1;
break;
case 6:/* a2 */
a2 = kdbpeek((int *)(sp + (short)i.IType.imm));
args[2] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[2] = 1;
break;
case 7:/* a3 */
a3 = kdbpeek((int *)(sp + (short)i.IType.imm));
break;
case 30: /* fp */
fp = kdbpeek((int *)(sp + (short)i.IType.imm));
args[3] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[3] = 1;
break;
case 31: /* ra */
@ -299,23 +303,23 @@ stacktrace_subr(struct trapframe *regs, int (*printfn) (const char *,...))
mask |= (1 << i.IType.rt);
switch (i.IType.rt) {
case 4:/* a0 */
a0 = kdbpeekD((int *)(sp + (short)i.IType.imm));
args[0] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[0] = 1;
break;
case 5:/* a1 */
a1 = kdbpeekD((int *)(sp + (short)i.IType.imm));
args[1] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[1] = 1;
break;
case 6:/* a2 */
a2 = kdbpeekD((int *)(sp + (short)i.IType.imm));
args[2] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[2] = 1;
break;
case 7:/* a3 */
a3 = kdbpeekD((int *)(sp + (short)i.IType.imm));
break;
case 30: /* fp */
fp = kdbpeekD((int *)(sp + (short)i.IType.imm));
args[3] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[3] = 1;
break;
case 31: /* ra */
@ -333,8 +337,17 @@ stacktrace_subr(struct trapframe *regs, int (*printfn) (const char *,...))
}
done:
(*printfn) ("%s+%x (%x,%x,%x,%x) ra %x sz %d\n",
fn_name(subr), pc - subr, a0, a1, a2, a3, ra, stksize);
(*printfn) ("%s+%x (", fn_name(subr), pc - subr);
for (j = 0; j < 4; j ++) {
if (j > 0)
(*printfn)(",");
if (valid_args[j])
(*printfn)("%x", args[j]);
else
(*printfn)("?");
}
(*printfn) (") ra %x sz %d\n", ra, stksize);
if (ra) {
if (pc == ra && stksize == 0)
@ -376,14 +389,6 @@ db_md_list_watchpoints()
{
}
static int
db_backtrace(struct thread *td, db_addr_t frame, int count)
{
stacktrace_subr((struct trapframe *)frame,
(int (*) (const char *, ...))db_printf);
return (0);
}
void
db_trace_self(void)
{
@ -394,10 +399,35 @@ db_trace_self(void)
int
db_trace_thread(struct thread *thr, int count)
{
register_t pc, ra, sp;
struct pcb *ctx;
ctx = kdb_thr_ctx(thr);
return (db_backtrace(thr, (db_addr_t) &ctx->pcb_regs, count));
if (thr == curthread) {
sp = (register_t)__builtin_frame_address(0);
ra = (register_t)__builtin_return_address(0);
__asm __volatile(
"jal 99f\n"
"nop\n"
"99:\n"
"move %0, $31\n" /* get ra */
"move $31, %1\n" /* restore ra */
: "=r" (pc)
: "r" (ra));
}
else {
ctx = thr->td_pcb;
sp = (register_t)ctx->pcb_context[PREG_SP];
pc = (register_t)ctx->pcb_context[PREG_PC];
ra = (register_t)ctx->pcb_context[PREG_RA];
}
stacktrace_subr(pc, sp, ra,
(int (*) (const char *, ...))db_printf);
return (0);
}
void

2
sys/mips/mips/trap.c
View File

@ -1203,7 +1203,7 @@ MipsEmulateBranch(struct trapframe *framePtr, uintptr_t instPC, int fpcCSR,
void
stacktrace(struct trapframe *regs)
{
stacktrace_subr(regs, printf);
stacktrace_subr(regs->pc, regs->sp, regs->ra, printf);
}
#endif