diff options
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/machdep.c | 21 | ||||
| -rw-r--r-- | sys/amd64/include/pcb.h | 3 |
2 files changed, 24 insertions, 0 deletions
diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c index 2d0fd66dcd4d..8a107ab76a4b 100644 --- a/sys/amd64/amd64/machdep.c +++ b/sys/amd64/amd64/machdep.c @@ -1265,6 +1265,27 @@ cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) pcpu->pc_acpi_id = 0xffffffff; } +/* + * Construct a PCB from a trapframe. This is called from kdb_trap() where + * we want to start a backtrace from the function that caused us to enter + * the debugger. We have the context in the trapframe, but base the trace + * on the PCB. The PCB doesn't have to be perfect, as long as it contains + * enough for a backtrace. + */ +void +makectx(struct trapframe *tf, struct pcb *pcb) +{ + + pcb->pcb_r12 = tf->tf_r12; + pcb->pcb_r13 = tf->tf_r13; + pcb->pcb_r14 = tf->tf_r14; + pcb->pcb_r15 = tf->tf_r15; + pcb->pcb_rbp = tf->tf_rbp; + pcb->pcb_rbx = tf->tf_rbx; + pcb->pcb_rip = tf->tf_rip; + pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8; +} + int ptrace_set_pc(struct thread *td, unsigned long addr) { diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h index 73d8aa558795..305b7ff895fe 100644 --- a/sys/amd64/include/pcb.h +++ b/sys/amd64/include/pcb.h @@ -78,6 +78,9 @@ struct pcb { }; #ifdef _KERNEL +struct trapframe; + +void makectx(struct trapframe *, struct pcb *); void savectx(struct pcb *); #endif |