Implement dt(4) utrace support on amd64 and i386.

This adds stacktrace_save_utrace() to extract and save the userland stack
which is stubbed out on most archs. alpha and riscv64 do not even implement
dt(4) and stacktrace_save_at() so the stubs are excluded there.

Additionally add a new ioctl DTIOCGETAUXBASE which allows btrace to
fetch the AUX_BASE vallue from the AUX vector of a process.

OK mpi@ (some time ago) discussed with kettenis@

Allow "ddb{1}> trace" through interrupt on macppc

If cpu0 sends PPC_IPI_DDB to cpu1, then cpu1 stops on its interrupt
stack. Teach ININTSTK to allow traces through all interrupt stacks,
not only cpu0's.

ININTSTK now works by looping for all cpus. It doesn't remember which
cpu owns the stack. A macppc has at most 4 cpus.

ok kettenis@ miod@

Give ddb more access to registers on macppc, powerpc64

Edit db_regs[] in db_trace.c on both powerpc and powerpc64, so ddb can
access $r14, $r15, $r16, $dar, $dsisr.

Only for powerpc: change db_trap_glue to copy all registers to and
from ddb_regs (it was skipping some); change db_set_single_step and
db_clear_single_step to flip the correct bit of srr1; delete
FIXUP_PC_AFTER_BREAK, which was off by 1 instruction.

"ddb{1}> s" on my PowerMac7,3 (dual G5 at 2700 MHz) began to panic
like, "*cpu0: mutex 0xa7d0a0 not held in tc_update_timekeep". Add an
arbitrary delay(100) after sending PPC_IPI_DDB; I want cpu0 to get the
ipi before it can see db_active == 1 and skip acquiring a mutex.

ok kettenis@

Use '/t' on all architectures to get a trace via TID.

ok sthen@, patrick@

Sync existing stacktrace_save() implementations

Upgrade stacktrace_save() to stacktrace_save_at() on architectures where
the latter is missing. Define stacktrace_save() as an inline function
in header <sys/stacktrace.h> to reduce duplication of code.

OK mpi@

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

Allow "ddb{1}> trace" through interrupt on macppc

If cpu0 sends PPC_IPI_DDB to cpu1, then cpu1 stops on its interrupt
stack. Teach ININTSTK to allow traces through all interrupt stacks,
not only cpu0's.

ININTSTK now works by looping for all cpus. It doesn't remember which
cpu owns the stack. A macppc has at most 4 cpus.

ok kettenis@ miod@

Give ddb more access to registers on macppc, powerpc64

Edit db_regs[] in db_trace.c on both powerpc and powerpc64, so ddb can
access $r14, $r15, $r16, $dar, $dsisr.

Only for powerpc: change db_trap_glue to copy all registers to and
from ddb_regs (it was skipping some); change db_set_single_step and
db_clear_single_step to flip the correct bit of srr1; delete
FIXUP_PC_AFTER_BREAK, which was off by 1 instruction.

"ddb{1}> s" on my PowerMac7,3 (dual G5 at 2700 MHz) began to panic
like, "*cpu0: mutex 0xa7d0a0 not held in tc_update_timekeep". Add an
arbitrary delay(100) after sending PPC_IPI_DDB; I want cpu0 to get the
ipi before it can see db_active == 1 and skip acquiring a mutex.

ok kettenis@

Use '/t' on all architectures to get a trace via TID.

ok sthen@, patrick@

Sync existing stacktrace_save() implementations

Upgrade stacktrace_save() to stacktrace_save_at() on architectures where
the latter is missing. Define stacktrace_save() as an inline function
in header <sys/stacktrace.h> to reduce duplication of code.

OK mpi@

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

Give ddb more access to registers on macppc, powerpc64

Edit db_regs[] in db_trace.c on both powerpc and powerpc64, so ddb can
access $r14, $r15, $r16, $dar, $dsisr.

Only for powerpc: change db_trap_glue to copy all registers to and
from ddb_regs (it was skipping some); change db_set_single_step and
db_clear_single_step to flip the correct bit of srr1; delete
FIXUP_PC_AFTER_BREAK, which was off by 1 instruction.

"ddb{1}> s" on my PowerMac7,3 (dual G5 at 2700 MHz) began to panic
like, "*cpu0: mutex 0xa7d0a0 not held in tc_update_timekeep". Add an
arbitrary delay(100) after sending PPC_IPI_DDB; I want cpu0 to get the
ipi before it can see db_active == 1 and skip acquiring a mutex.

ok kettenis@

Use '/t' on all architectures to get a trace via TID.

ok sthen@, patrick@

Sync existing stacktrace_save() implementations

Upgrade stacktrace_save() to stacktrace_save_at() on architectures where
the latter is missing. Define stacktrace_save() as an inline function
in header <sys/stacktrace.h> to reduce duplication of code.

OK mpi@

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

Use '/t' on all architectures to get a trace via TID.

ok sthen@, patrick@

Sync existing stacktrace_save() implementations

Upgrade stacktrace_save() to stacktrace_save_at() on architectures where
the latter is missing. Define stacktrace_save() as an inline function
in header <sys/stacktrace.h> to reduce duplication of code.

OK mpi@

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

Sync existing stacktrace_save() implementations

Upgrade stacktrace_save() to stacktrace_save_at() on architectures where
the latter is missing. Define stacktrace_save() as an inline function
in header <sys/stacktrace.h> to reduce duplication of code.

OK mpi@

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

Implement stacktrace_save_at() required for upcoming WITNESS.

ok gkoehler@

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

db_addr_t -> vaddr_t

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.

add support for printing function arguments when displaying a trace
from DDB. this uses CTF to get the correct number of arguments.

ok mpi@

Kill db_sym_t.

ok deraadt@, kettenis@, jasper@

Rename pfind(9) into tfind(9) to reflect that it deals with threads.

While here document prfind(9.

with and ok guenther@

take it one step further and bring the message inline with arm/sparc64

pointed out by guenther@

don't hardcode the filename in an error message; use the function name instead

ok jsg@ (who spotted the powerpc straggler too) millert@

Define db_reg_t like the other archs by typedef'ing "struct trapframe".

This will allow us to use some of the DDB macros on trapframe which are
not DDB_REGS.

DDB_REGS -> ddb_regs in db_regs[], no reason to be different.

Rewrite the PowerPC stack dump routine to delimit the trap & interrupt
contexts with markers (---like on x86---) and print the associated type
or number when available.

While here, gyp' the support for process tracing (tr /p).

ok miod@

use nitems() instead of handrolling something identical

ok mpi@ sthen@

Housecleaning, no binary change.

branches: 1.3.4;
Remove an unnecessary structure copy from useage of setfault(), call
by reference, not by value, ok matthieu#, miod@

move ddb_regs decl from .h to .c to avoid common

branches: 1.1.4;
One ddb to rule them all.

Move the ddb files form macppc/macppc to powerpc/ddb, so that mvmeppc
can benefit from the better ddb that was in macppc.
db_interface.c is left as an md part.