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author | Marcel Moolenaar <marcel@FreeBSD.org> | 2004-07-10 19:56:00 +0000 |
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committer | Marcel Moolenaar <marcel@FreeBSD.org> | 2004-07-10 19:56:00 +0000 |
commit | 5a39cbaf691680e0efa60ed8fa28fa9f1232ecaa (patch) | |
tree | ef114b5aee4601f2523b9d10bcaef23b379b7b6a /sys/sparc64 | |
parent | 0aefe3632ecf2a584bb5edca9652b8fc3340f4fc (diff) | |
download | src-5a39cbaf691680e0efa60ed8fa28fa9f1232ecaa.tar.gz src-5a39cbaf691680e0efa60ed8fa28fa9f1232ecaa.zip |
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.
Notes
Notes:
svn path=/head/; revision=131905
Diffstat (limited to 'sys/sparc64')
-rw-r--r-- | sys/sparc64/include/pcb.h | 1 | ||||
-rw-r--r-- | sys/sparc64/sparc64/machdep.c | 15 |
2 files changed, 16 insertions, 0 deletions
diff --git a/sys/sparc64/include/pcb.h b/sys/sparc64/include/pcb.h index 38578d278deb..1f1e8dcb2540 100644 --- a/sys/sparc64/include/pcb.h +++ b/sys/sparc64/include/pcb.h @@ -49,6 +49,7 @@ struct pcb { } __aligned(64); #ifdef _KERNEL +void makectx(struct trapframe *, struct pcb *); int savectx(struct pcb *pcb); #endif diff --git a/sys/sparc64/sparc64/machdep.c b/sys/sparc64/sparc64/machdep.c index 3db2dd8209ea..2bc8329cb819 100644 --- a/sys/sparc64/sparc64/machdep.c +++ b/sys/sparc64/sparc64/machdep.c @@ -564,6 +564,21 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) } #endif +/* + * 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_pc = tf->tf_tpc; + pcb->pcb_sp = tf->tf_sp; +} + int get_mcontext(struct thread *td, mcontext_t *mc, int flags) { |