Swap the r10 and rcx registers in the amd64 trapframe so that the
first six entries are in the same order as syscall arguments, such
that syscall() can just use the trapframe as the argument vector
for mi_syscall() and not need to reorder into another buffer on the
stack. This doesn't affect coredump layout or ptrace(2), but does
affect kernel crash dumps.

Possibility noted during miod@'s cleanup of the MD syscall()
implementations

ok mlarkin@ kurt@

Fix backtrace command with kernel core.

ok mpi@

Teach gdb that the trap frame should be used for alltraps_kern_meltdown().

ok bluhm kettenis

Fix backtrace across signals on amd64
okay guenther@ kettenis@

Fix gdb can handle prologues which has the retguard and teach gdb that
alltraps_kern() is a trap function. Also initialize the struct
amd64_frame_cache in amd64_skip_prologue() which was missing.
Original diff from IIJ.

ok mpi mortimer kettenis deraadt

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Fix backtrace command with kernel core.

ok mpi@

Teach gdb that the trap frame should be used for alltraps_kern_meltdown().

ok bluhm kettenis

Fix backtrace across signals on amd64
okay guenther@ kettenis@

Fix gdb can handle prologues which has the retguard and teach gdb that
alltraps_kern() is a trap function. Also initialize the struct
amd64_frame_cache in amd64_skip_prologue() which was missing.
Original diff from IIJ.

ok mpi mortimer kettenis deraadt

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Teach gdb that the trap frame should be used for alltraps_kern_meltdown().

ok bluhm kettenis

Fix backtrace across signals on amd64
okay guenther@ kettenis@

Fix gdb can handle prologues which has the retguard and teach gdb that
alltraps_kern() is a trap function. Also initialize the struct
amd64_frame_cache in amd64_skip_prologue() which was missing.
Original diff from IIJ.

ok mpi mortimer kettenis deraadt

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Fix backtrace across signals on amd64
okay guenther@ kettenis@

Fix gdb can handle prologues which has the retguard and teach gdb that
alltraps_kern() is a trap function. Also initialize the struct
amd64_frame_cache in amd64_skip_prologue() which was missing.
Original diff from IIJ.

ok mpi mortimer kettenis deraadt

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Fix gdb can handle prologues which has the retguard and teach gdb that
alltraps_kern() is a trap function. Also initialize the struct
amd64_frame_cache in amd64_skip_prologue() which was missing.
Original diff from IIJ.

ok mpi mortimer kettenis deraadt

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Drop the ignored selectors (tf_[defg]s) from the trap and interrupt frames.

ok mlarkin@ deraadt@ mpi@ kettenis@

Make intrframe the exact same size as trapframe: instead of pushing
the PPL on top, store it where trapframe puts the trap number. This
makes interrupt handlers get called with the correct stack alignment.
Also, document the use of if_err to differentiate resumed/recursed
interrupts from 'real' ones.

tested in snaps
ok deraadt@

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

The trapframe layout is no longer exactly the same as the sigcontext
layout. Simplify how we identify which frames have trapframes while here.

ok kettenis@

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision

Sync symbol lists for trap/interrupt frame detection with what ddb(4) uses

ok deraadt@

Depending on wether the kernel has been compiled with or without
debug information, gdb will either see calltrap or alltraps in the
stack trace of a kernel core file. To make the gdb backtrace command
work without debug information in the amd64 kernel, add the same
special case for alltraps as for calltrap.
OK miod@

Fix backtrace across signals on amd64

ok kettenis@

add compat support to gdb so that it can deal with libpthread with and
without the _thread_ctx_offset private symbol. okay kettenis@

Teach bfd and gdb about the upcoming ELF core dumps.

Teach gdb how to unwind amd64 kernel trap frames.

amd64 threads support.

branches: 1.1.1;
Initial revision