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freebsd-dev/sys/ia64/include/unwind.h

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Don't call malloc() and free() while in the debugger and unwinding to get a stacktrace. This does not work even with M_NOWAIT when we have WITNESS and is generally a bad idea (pointed out by bde@). We allocate an 8K heap for use by the unwinder when ddb is active. A stack trace roughly takes up half of that in any case, so we have some room for complex unwind situations. We don't want to waste too much space though. Due to the nature of unwinding, we don't worry too much about fragmentation or performance of unwinding while in the debugger. For now we have our own heap management, but we may be able to leverage from existing code at some later time. While here: o Make sure we actually free the unwind environment after unwinding. This fixes a memory leak. o Replace Doug's license with mine in unwind.c and unwind.h. Both files don't have much, if any, of Doug's code left since the EPC syscall overhaul and the import of the unwinder. o Remove dead code. o Replace M_NOWAIT with M_WAITOK for all remaining malloc() calls.
2003-07-05 23:21:58 +00:00
/*
* Copyright (c) 2003 Marcel Moolenaar
* Factor out common code for manipulating the RSE backing store. * Implement a fairly simplistic parser for unwinding stack frames. * Use unwind records for DDB's 'trace' command. Also add support for tracing past exceptions to the context which generated the exception. The stack unwind code requires a toolchain based on binutils-2.11.2 or later and gcc-3.0.1 or later.
2001-10-29 12:04:23 +00:00
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
Don't call malloc() and free() while in the debugger and unwinding to get a stacktrace. This does not work even with M_NOWAIT when we have WITNESS and is generally a bad idea (pointed out by bde@). We allocate an 8K heap for use by the unwinder when ddb is active. A stack trace roughly takes up half of that in any case, so we have some room for complex unwind situations. We don't want to waste too much space though. Due to the nature of unwinding, we don't worry too much about fragmentation or performance of unwinding while in the debugger. For now we have our own heap management, but we may be able to leverage from existing code at some later time. While here: o Make sure we actually free the unwind environment after unwinding. This fixes a memory leak. o Replace Doug's license with mine in unwind.c and unwind.h. Both files don't have much, if any, of Doug's code left since the EPC syscall overhaul and the import of the unwinder. o Remove dead code. o Replace M_NOWAIT with M_WAITOK for all remaining malloc() calls.
2003-07-05 23:21:58 +00:00
*
* Factor out common code for manipulating the RSE backing store. * Implement a fairly simplistic parser for unwinding stack frames. * Use unwind records for DDB's 'trace' command. Also add support for tracing past exceptions to the context which generated the exception. The stack unwind code requires a toolchain based on binutils-2.11.2 or later and gcc-3.0.1 or later.
2001-10-29 12:04:23 +00:00
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
Don't call malloc() and free() while in the debugger and unwinding to get a stacktrace. This does not work even with M_NOWAIT when we have WITNESS and is generally a bad idea (pointed out by bde@). We allocate an 8K heap for use by the unwinder when ddb is active. A stack trace roughly takes up half of that in any case, so we have some room for complex unwind situations. We don't want to waste too much space though. Due to the nature of unwinding, we don't worry too much about fragmentation or performance of unwinding while in the debugger. For now we have our own heap management, but we may be able to leverage from existing code at some later time. While here: o Make sure we actually free the unwind environment after unwinding. This fixes a memory leak. o Replace Doug's license with mine in unwind.c and unwind.h. Both files don't have much, if any, of Doug's code left since the EPC syscall overhaul and the import of the unwinder. o Remove dead code. o Replace M_NOWAIT with M_WAITOK for all remaining malloc() calls.
2003-07-05 23:21:58 +00:00
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* Factor out common code for manipulating the RSE backing store. * Implement a fairly simplistic parser for unwinding stack frames. * Use unwind records for DDB's 'trace' command. Also add support for tracing past exceptions to the context which generated the exception. The stack unwind code requires a toolchain based on binutils-2.11.2 or later and gcc-3.0.1 or later.
2001-10-29 12:04:23 +00:00
*
* $FreeBSD$
*/
Revamp of the syscall path, exception and context handling. The prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
2003-05-16 21:26:42 +00:00
#ifndef _MACHINE_UNWIND_H_
#define _MACHINE_UNWIND_H_
* Factor out common code for manipulating the RSE backing store. * Implement a fairly simplistic parser for unwinding stack frames. * Use unwind records for DDB's 'trace' command. Also add support for tracing past exceptions to the context which generated the exception. The stack unwind code requires a toolchain based on binutils-2.11.2 or later and gcc-3.0.1 or later.
2001-10-29 12:04:23 +00:00
Revamp of the syscall path, exception and context handling. The prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
2003-05-16 21:26:42 +00:00
struct uwx_env;
struct unw_regstate {
struct trapframe *frame;
struct uwx_env *env;
uint64_t keyval[8];
};
int unw_create(struct unw_regstate *s, struct trapframe *tf);
Don't call malloc() and free() while in the debugger and unwinding to get a stacktrace. This does not work even with M_NOWAIT when we have WITNESS and is generally a bad idea (pointed out by bde@). We allocate an 8K heap for use by the unwinder when ddb is active. A stack trace roughly takes up half of that in any case, so we have some room for complex unwind situations. We don't want to waste too much space though. Due to the nature of unwinding, we don't worry too much about fragmentation or performance of unwinding while in the debugger. For now we have our own heap management, but we may be able to leverage from existing code at some later time. While here: o Make sure we actually free the unwind environment after unwinding. This fixes a memory leak. o Replace Doug's license with mine in unwind.c and unwind.h. Both files don't have much, if any, of Doug's code left since the EPC syscall overhaul and the import of the unwinder. o Remove dead code. o Replace M_NOWAIT with M_WAITOK for all remaining malloc() calls.
2003-07-05 23:21:58 +00:00
void unw_delete(struct unw_regstate *s);
Revamp of the syscall path, exception and context handling. The prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
2003-05-16 21:26:42 +00:00
int unw_step(struct unw_regstate *s);
int unw_get_bsp(struct unw_regstate *s, uint64_t *r);
int unw_get_cfm(struct unw_regstate *s, uint64_t *r);
int unw_get_ip(struct unw_regstate *s, uint64_t *r);
Add logic to trace across/over a trapframe. We have ABI markers in our unwind information for functions that are entry points into the kernel. When stepping to the next frame, the unwinder will let us know when sych a marker was encountered. We use this to stop the current unwind session, query the trapframe and restart a new unwind session based on the new trapframe. The implementation is a bit sloppy, but at this time there are bigger fish to fry.
2003-07-12 04:35:09 +00:00
int unw_get_sp(struct unw_regstate *s, uint64_t *r);
Revamp of the syscall path, exception and context handling. The prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
2003-05-16 21:26:42 +00:00
int unw_table_add(uint64_t, uint64_t, uint64_t);
void unw_table_remove(uint64_t);
#endif /* _MACHINE_UNWIND_H_ */
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