diff options
author | marcel <marcel@FreeBSD.org> | 2004-07-10 19:56:00 +0000 |
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committer | marcel <marcel@FreeBSD.org> | 2004-07-10 19:56:00 +0000 |
commit | 006d404cf77cb76437589bef7e0e1bb57c7bd79d (patch) | |
tree | ef114b5aee4601f2523b9d10bcaef23b379b7b6a /sys/amd64 | |
parent | 8a7d828338d290e43e0ba04946b945be561589c7 (diff) | |
download | FreeBSD-src-006d404cf77cb76437589bef7e0e1bb57c7bd79d.zip FreeBSD-src-006d404cf77cb76437589bef7e0e1bb57c7bd79d.tar.gz |
Implement makectx(). The makectx() function is used by KDB to create
a PCB from a trapframe for purposes of unwinding the stack. The PCB
is used as the thread context and all but the thread that entered the
debugger has a valid PCB.
This function can also be used to create a context for the threads
running on the CPUs that have been stopped when the debugger got
entered. This however is not done at the time of this commit.
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 2d0fd66..8a107ab 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 73d8aa5..305b7ff 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 |