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Rewrite to resemble something that actually might work.

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(Logical change 1.29)
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mostang.com!davidm 2002-12-03 08:19:58 +00:00
parent 57f5fae02b
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190
include/libunwind-dynamic.h
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@ -23,109 +23,155 @@ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#ifndef LIBUNWIND_DYNAMIC_H
#define LIBUNWIND_DYNAMIC_H
/* This file defines the runtime-support routines for dynamically /* This file defines the runtime-support routines for dynamically
generated code. Even though it is implemented as part of generated code. Even though it is implemented as part of libunwind,
libunwind, it is logically separate from the interface to perform it is logically separate from the interface to perform the actual
the actual unwinding. In particular, this interface is always used unwinding. In particular, this interface is always used in the
in the context of the unwind target, whereas the rest of the unwind context of the unwind target, whereas the rest of the unwind API is
API is used in context of the process that is doing the unwind used in context of the process that is doing the unwind (which may be
(which may be a debugger running on another machine, for a debugger running on another machine, for example).
example). */
Note that the data-structures declared here server a dual purpose:
when a program registers a dynamically generated procedure, it uses
these structures directly. On the other hand, with remote-unwinding,
the data-structures are read from the remote process's memory and
translated into internalized versions. Because of this, care needs to
be taken when choosing the types of structure members: use a pointer
only if the member can be translated into an internalized equivalent
(such as a string). Similarly, for members that need to hold an
address in the unwindee, unw_word_t needs to be used. */
typedef enum typedef enum
{ {
UNW_OP_SAVE_REG, /* save register to another register */ UNW_DYN_STOP = 0, /* end-of-unwind-info marker */
UNW_OP_SPILL_FP_REL, /* frame-pointer-relative register spill */ UNW_DYN_SAVE_REG, /* save register to another register */
UNW_OP_SPILL_SP_REL, /* stack-pointer-relative register spill */ UNW_DYN_SPILL_FP_REL, /* frame-pointer-relative register spill */
UNW_OP_ADD, /* add constant value to a register */ UNW_DYN_SPILL_SP_REL, /* stack-pointer-relative register spill */
UNW_OP_POP_STACK, /* drop one or more stack frames */ UNW_DYN_ADD, /* add constant value to a register */
UNW_OP_LABEL_STATE, /* name the current state */ UNW_DYN_POP_FRAMES, /* drop one or more stack frames */
UNW_OP_COPY_STATE, /* set the region's entry-state */ UNW_DYN_LABEL_STATE, /* name the current state */
UNW_OP_ALIAS, /* get unwind info from an alias */ UNW_DYN_COPY_STATE, /* set the region's entry-state */
UNW_OP_STOP /* end-of-unwind-info marker */ UNW_DYN_ALIAS /* get unwind info from an alias */
} }
unw_operator_t; unw_dyn_operation_t;
typedef struct unw_proc_info typedef struct unw_dyn_op
{ {
unsigned long private[4]; /* reserved for use by libunwind */ uint16_t tag; /* what operation? */
void *proc_start; /* first text-address of procedure */ int16_t reg; /* what register */
void *proc_end; /* first text-address beyond the procedure */ int16_t qp; /* qualifying predicate register */
unsigned long flags; int16_t pad0;
const char *proc_name; /* unique & human-readable procedure name */ int32_t when; /* when does it take effect? */
void *creator_hook; /* hook for whoever created this procedure */ unw_word_t val; /* auxiliary value */
unsigned long reserved[7]; /* reserved for future extensions */
} }
unw_proc_info_t; unw_dyn_op_t;
typedef struct unw_region_info typedef struct unw_dyn_region_info
{ {
struct unw_region_info *next; /* NULL-terminated list of regions */ struct unw_dyn_region_info *next; /* linked list of regions */
void *creator_hook; uint32_t insn_count; /* region length (# of instructions) */
unsigned int insn_count; /* region length (# of instructions) */ uint32_t op_count; /* length of op-array */
unsigned int op_count; /* length of op-array */ unw_dyn_op_t op[1]; /* variable-length op-array */
unsigned long reserved[5]; }
struct unw_op_t unw_dyn_region_info_t;
typedef struct unw_dyn_proc_info
{
const char *name; /* unique & human-readable procedure name */
unw_word_t handler; /* address of personality routine */
uint32_t flags;
unw_dyn_region_info_t *regions;
}
unw_dyn_proc_info_t;
typedef struct unw_dyn_table_info
{
const char *name; /* table name (e.g., name of library) */
unw_word_t segbase; /* segment base */
unw_word_t table_size;
void *table_data;
}
unw_dyn_table_info_t;
typedef struct unw_dyn_info
{
struct unw_dyn_info *next; /* linked list of dyn-info structures */
unw_word_t start_ip; /* first IP covered by this entry */
unw_word_t end_ip; /* first IP NOT covered by this entry */
unw_word_t gp; /* global-pointer in effect for this entry */
enum
{ {
unsigned int tag : 16; /* what operation? */ UNW_INFO_FORMAT_DYNAMIC, /* unw_dyn_proc_info_t */
unsigned int reg : 16; /* what register */ UNW_INFO_FORMAT_TABLE /* unw_dyn_table_t */
unsigned int when : 32; /* when does it take effect? */
unsigned long val; /* auxiliary value */
} }
op[1]; format;
union
{
unw_dyn_proc_info_t pi;
unw_dyn_table_info_t ti;
}
u;
} }
unw_region_info_t; unw_dyn_info_t;
/* Return the size (in bytes) of an unw_region_info_t structure that can typedef struct unw_dyn_info_list
{
unsigned long generation;
unw_dyn_info_t *first;
}
unw_dyn_info_list_t;
/* Return the size (in bytes) of an unw_dyn_region_info_t structure that can
hold OP_COUNT ops. */ hold OP_COUNT ops. */
#define unw_region_info_size(op_count) \ #define _U_dyn_region_info_size(op_count) \
(sizeof (unw_region_info_t) \ (sizeof (unw_dyn_region_info_t) \
+ (op_count > 0) ? ((op_count) - 1) * sizeof (struct unw_op) : 0) + (op_count > 0) ? ((op_count) - 1) * sizeof (unw_dyn_op_t) : 0)
/* Register the unwind info for a single procedure. /* Register the unwind info for a single procedure.
This routine is NOT signal-safe. */ This routine is NOT signal-safe. */
extern int unw_register_proc (unw_proc_info_t *proc); extern int _U_dyn_register (unw_dyn_info_t *di);
/* Cancel the unwind info for a single procedure. /* Cancel the unwind info for a single procedure.
This routine is NOT signal-safe. */ This routine is NOT signal-safe. */
extern int unw_cancel_proc (unw_proc_info_t *proc); extern int _U_dyn_cancel (unw_dyn_info_t *di);
/* Convenience routines. */ /* Convenience routines. */
#define unw_op(tag, when, reg, val) \ #define _U_dyn_op(_t, _q, _w, _r, _v) \
(struct unw_op_t) { \ ((unw_dyn_op_t) { \
.tag = (tag), \ .tag = (_t), \
.when = (when), \ .qp = (_q), \
.reg = (reg), \ .when = (_w), \
.val = (val) \ .reg = (_r), \
} .val = (_v) \
})
#define unw_op_save_reg(op, when, reg, dst) \ #define _U_dyn_op_save_reg(op, qp, when, reg, dst) \
unw_op(UNW_OP_SAVE_REG, (when), (reg), (dst)) (*(op) = _U_dyn_op (UNW_DYN_SAVE_REG, (qp), (when), (reg), (dst)))
#define unw_op_spill_fp_rel(when, reg, offset) \ #define _U_dyn_op_spill_fp_rel(op, qp, when, reg, offset) \
unw_op(UNW_OP_SPILL_FP_REL, (when), (reg), (offset)) (*(op) = _U_dyn_op (UNW_DYN_SPILL_FP_REL, (qp), (when), (reg), \
(offset)))
#define unw_op_spill_sp_rel(when, reg, offset) \ #define _U_dyn_op_spill_sp_rel(op, qp, when, reg, offset) \
unw_op(UNW_OP_SPILL_SP_REL, (when), (reg), (offset)) (*(op) = _U_dyn_op (UNW_DYN_SPILL_SP_REL, (qp), (when), (reg), \
(offset)))
#define unw_op_add(when, reg, value) \ #define _U_dyn_op_add(op, qp, when, reg, value) \
unw_op(UNW_OP_ADD, (when), (reg), (value)) (*(op) = _U_dyn_op (UNW_DYN_ADD, (qp), (when), (reg), (value)))
#define unw_op_pop_stack(op, num_frames) \ #define _U_dyn_op_pop_frames(op, qp, when, num_frames) \
unw_op(UNW_OP_POP_STACK, (when), 0, (num_frames)) (*(op) = _U_dyn_op (UNW_DYN_POP_frames, (qp), (when), 0, (num_frames)))
#define unw_op_label_state(op, when, label) \ #define _U_dyn_op_label_state(op, qp, when, label) \
unw_op(UNW_OP_LABEL_STATE, (when), 0, (label)) (*(op) = _U_dyn_op (UNW_DYN_LABEL_STATE, (qp), (when), 0, (label)))
#define unw_op_copy_state(op, when, label) \ #define _U_dyn_op_copy_state(op, qp, when, label) \
unw_op(UNW_OP_COPY_STATE, (when), 0, (label)) (*(op) = _U_dyn_op (UNW_DYN_COPY_STATE, (qp), (when), 0, (label)))
#define unw_op_alias(op, when, delta) \ #define _U_dyn_op_alias(op, qp, when, addr) \
unw_op(UNW_OP_ALIAS, (when), 0, (label)) (*(op) = _U_dyn_op (UNW_DYN_ALIAS, (qp), (when), 0, (addr)))
#endif /* LIBUNWIND_DYNAMIC_H */ #define _U_dyn_op_stop(op) \
((op)->tag = UNW_DYN_STOP)