387 lines
8.4 KiB
Plaintext
387 lines
8.4 KiB
Plaintext
.TH DEBUGGER 2
|
|
.SH NAME
|
|
cisctrace, risctrace, ciscframe, riscframe, localaddr, symoff,
|
|
fpformat, beieee80ftos, beieeesftos, beieeedftos, leieee80ftos,
|
|
leieeesftos, leieeedftos, ieeesftos, ieeedftos \- machine-independent debugger functions
|
|
.SH SYNOPSIS
|
|
.B #include <u.h>
|
|
.br
|
|
.B #include <libc.h>
|
|
.br
|
|
.B #include <bio.h>
|
|
.br
|
|
.B #include <mach.h>
|
|
.PP
|
|
.ta \w'\fLmachines 'u
|
|
.nf
|
|
.B
|
|
int cisctrace(Map *map, ulong pc, ulong sp, ulong link,
|
|
.B
|
|
Tracer trace)
|
|
.PP
|
|
.nf
|
|
.B
|
|
int risctrace(Map *map, ulong pc, ulong sp, ulong link,
|
|
.B
|
|
Tracer trace)
|
|
.PP
|
|
.nf
|
|
.B
|
|
ulong ciscframe(Map *map, ulong addr, ulong pc, ulong sp,
|
|
.B
|
|
ulong link)
|
|
.PP
|
|
.nf
|
|
.B
|
|
ulong riscframe(Map *map, ulong addr, ulong pc, ulong sp,
|
|
.B
|
|
ulong link)
|
|
.PP
|
|
.nf
|
|
.B
|
|
int localaddr(Map *map, char *fn, char *var, long *ret,
|
|
.B
|
|
Rgetter rget)
|
|
.PP
|
|
.B
|
|
int symoff(char *buf, int n, long addr, int type)
|
|
.PP
|
|
.B
|
|
int fpformat(Map *map, Reglist *rp, char *buf, int n, int code)
|
|
.PP
|
|
.B
|
|
int beieee80ftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int beieeesftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int beieeedftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int leieee80ftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int leieeesftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int leieeedftos(char *buf, int n, void *fp)
|
|
.PP
|
|
.B
|
|
int ieeesftos(char *buf, int n, ulong f)
|
|
.PP
|
|
.B
|
|
int ieeedftos(char *buf, int n, ulong high, ulong low)
|
|
.PP
|
|
.B
|
|
extern Machdata *machdata;
|
|
.SH DESCRIPTION
|
|
These functions provide machine-independent implementations
|
|
of common debugger functions.
|
|
Many of the functions assume that global variables
|
|
.I mach
|
|
and
|
|
.I machdata
|
|
point to the
|
|
.I Mach
|
|
and
|
|
.I Machdata
|
|
data structures describing the target architecture.
|
|
The former contains machine parameters and a description of
|
|
the register set; it is usually
|
|
set by invoking
|
|
.I crackhdr
|
|
(see
|
|
.IR mach (2))
|
|
to interpret the header of an executable.
|
|
The
|
|
.I Machdata
|
|
structure
|
|
is primarily a jump table specifying
|
|
functions appropriate for processing an
|
|
executable image for a given architecture.
|
|
Each application is responsible for setting
|
|
.I machdata
|
|
to the address of the
|
|
.I Machdata
|
|
structure for the target architecture.
|
|
Many of the functions described here are not
|
|
called directly; instead, they are invoked
|
|
indirectly through the
|
|
.I Machdata
|
|
jump table.
|
|
.PP
|
|
These functions must retrieve data and register contents
|
|
from an executing image. The
|
|
.I Map
|
|
(see
|
|
.IR mach (2))
|
|
data structure
|
|
supports the consistent retrieval of data, but
|
|
no uniform access mechanism exists for registers.
|
|
The application passes the address of a register
|
|
retrieval function as an argument to those functions
|
|
requiring register values.
|
|
This function, called an
|
|
.IR Rgetter ,
|
|
is of the form
|
|
.PP
|
|
.RS
|
|
.B "ulong rget(Map *map, char *name);
|
|
.RE
|
|
.PP
|
|
It returns the contents of a register when given
|
|
the address of a
|
|
.I Map
|
|
associated with an executing image and the name of the register.
|
|
.PP
|
|
.I Cisctrace
|
|
and
|
|
.I risctrace
|
|
unwind the stack for up to 40 levels or until the frame for
|
|
.I main
|
|
is found. They return the
|
|
count of the number of levels unwound. These functions
|
|
process stacks conforming to the generic compiler model for
|
|
.SM RISC
|
|
and
|
|
.SM CISC
|
|
architectures, respectively.
|
|
.I Map
|
|
is the address of a
|
|
.I Map
|
|
data structure associated with the image
|
|
of an executing process.
|
|
.IR Sp ,
|
|
.I pc
|
|
and
|
|
.I link
|
|
are starting values for the stack pointer, program counter, and
|
|
link register from which the unwinding is to take place. Normally, they are
|
|
the current contents of the appropriate
|
|
registers but they can be any values defining a legitimate
|
|
process context, for example, an alternate stack in a
|
|
multi-threaded process.
|
|
.I Trace
|
|
is the address of an application-supplied function to be called
|
|
on each iteration as the frame unwinds. The prototype of this
|
|
function is:
|
|
.PP
|
|
.RS
|
|
.B "void tracer(Map *map, ulong pc, ulong fp, Symbol *s);
|
|
.RE
|
|
.PP
|
|
where
|
|
.I Map
|
|
is the
|
|
.I Map
|
|
pointer passed to
|
|
.I cisctrace
|
|
or
|
|
.I risctrace
|
|
and
|
|
.I pc
|
|
and
|
|
.I fp
|
|
are the program counter and frame pointer.
|
|
.I S
|
|
is the address of a
|
|
.I Symbol
|
|
structure, as defined in
|
|
.IR symbol (2),
|
|
containing the symbol table information for the
|
|
function owning the frame (i.e., the function that
|
|
caused the frame to be instantiated).
|
|
.PP
|
|
.I Ciscframe
|
|
and
|
|
.I riscframe
|
|
calculate the frame pointer associated with
|
|
a function. They are suitable for
|
|
programs conforming to the
|
|
.SM CISC
|
|
and
|
|
.SM RISC
|
|
stack models.
|
|
.I Map
|
|
is the address of a
|
|
.I Map
|
|
associated with the memory image of an executing
|
|
process.
|
|
.I Addr
|
|
is the entry point of the desired function.
|
|
.IR Pc ,
|
|
.I sp
|
|
and
|
|
.I link
|
|
are the program counter, stack pointer and link register of
|
|
an execution context. As with the stack trace
|
|
functions, these can be the current values of the
|
|
registers or any legitimate execution context.
|
|
The value of the frame pointer is returned. A return
|
|
value of zero indicates an error.
|
|
.PP
|
|
.I Localaddr
|
|
fills the location
|
|
pointed to by
|
|
.I ret
|
|
with the address of a local variable.
|
|
.I Map
|
|
is the address of a
|
|
.I Map
|
|
associated with an executing memory image.
|
|
.I Fn
|
|
and
|
|
.I var
|
|
are pointers to the names of the function and variable of interest.
|
|
.I Rget
|
|
is the address of a register retrieval function.
|
|
If both
|
|
.I fn
|
|
and
|
|
.I var
|
|
are non-zero, the frame for function
|
|
.I fn
|
|
is calculated and the address of the automatic or
|
|
argument named
|
|
.I var
|
|
in that frame is returned.
|
|
If
|
|
.I var
|
|
is zero, the address of the
|
|
frame for function
|
|
.I fn
|
|
is returned.
|
|
In all cases, the frame for the function named
|
|
.I fn
|
|
must be instantiated somewhere on the current stack.
|
|
If there are multiple frames for the function (that is, if
|
|
it is recursive), the most recent frame is used.
|
|
The search starts from the context defined by the
|
|
current value of the program counter and stack pointer.
|
|
If a valid address is found,
|
|
.I localaddr
|
|
returns 1. A negative return indicates an error in
|
|
resolving the address.
|
|
.PP
|
|
.I Symoff
|
|
converts a virtual address to a symbolic reference. The
|
|
string containing that reference is of
|
|
the form `name+offset', where `name' is the name of the
|
|
nearest symbol with an address less than
|
|
or equal to the target address and `offset' is the hexadecimal offset
|
|
beyond that symbol. If `offset' is zero, only the name of
|
|
the symbol is printed. If no symbol is found within 4,096
|
|
bytes of the address, the address is formatted as a hexadecimal
|
|
address.
|
|
.I Buf
|
|
is the address of a buffer of
|
|
.I n
|
|
characters to receive the formatted string.
|
|
.I Addr
|
|
is the address to be converted.
|
|
.I Type
|
|
is the type code of the search space:
|
|
.BR CTEXT ,
|
|
.BR CDATA ,
|
|
or
|
|
.BR CANY .
|
|
.I Symoff
|
|
returns the length of the formatted string contained in
|
|
.IR buf .
|
|
.PP
|
|
.I Fpformat
|
|
converts the contents of a floating point register to a
|
|
string.
|
|
.I Map
|
|
is the address of a
|
|
.I Map
|
|
associated with an executing process.
|
|
.I Rp
|
|
is the address of a
|
|
.I Reglist
|
|
data structure describing the desired register.
|
|
.I Buf
|
|
is the address of a buffer of
|
|
.I n
|
|
characters to hold the resulting string.
|
|
.I Code
|
|
must be either
|
|
.B F
|
|
or
|
|
.BR f,
|
|
selecting double
|
|
or single precision, respectively. If
|
|
.I code
|
|
is
|
|
.BR F ,
|
|
the contents of the specified register and
|
|
the following register
|
|
are interpreted as a double precision floating point
|
|
number; this
|
|
is only meaningful for architectures that implement
|
|
double precision floats by combining adjacent
|
|
single precision registers.
|
|
For
|
|
.I code
|
|
.BR f ,
|
|
the specified register is formatted
|
|
as a single precision float.
|
|
.I Fpformat
|
|
returns 1 if the number is successfully converted or \-1
|
|
in the case of an error.
|
|
.PP
|
|
.IR Beieee80ftos ,
|
|
.I beieeesftos
|
|
and
|
|
.I beieeedftos
|
|
convert big-endian 80-bit extended, 32-bit single precision,
|
|
and 64-bit double precision floating point values to
|
|
a string.
|
|
.IR Leieee80ftos ,
|
|
.IR leieeesftos ,
|
|
and
|
|
.I leieeedftos
|
|
are the little-endian counterparts.
|
|
.I Buf
|
|
is the address of a buffer of
|
|
.I n
|
|
characters to receive the formatted string.
|
|
.I Fp
|
|
is the address of the floating point value to be
|
|
converted. These functions return the length of
|
|
the resulting string.
|
|
.PP
|
|
.I Ieeesftos
|
|
converts the 32-bit single precision floating point value
|
|
.IR f ,
|
|
to a string in
|
|
.IR buf ,
|
|
a buffer of
|
|
.I n
|
|
bytes. It returns the length of the resulting string.
|
|
.PP
|
|
.I Ieeedftos
|
|
converts a 64-bit double precision floating point value
|
|
to a character string.
|
|
.I Buf
|
|
is the address of a buffer of
|
|
.I n
|
|
characters to hold the resulting string.
|
|
.I High
|
|
and
|
|
.I low
|
|
contain the most and least significant 32 bits of
|
|
the floating point value, respectively.
|
|
.I Ieeedftos
|
|
returns the number of characters in the resulting string.
|
|
.SH SOURCE
|
|
.B /sys/src/libmach
|
|
.SH "SEE ALSO"
|
|
.IR mach (2),
|
|
.IR symbol (2),
|
|
.IR errstr (2)
|
|
.SH DIAGNOSTICS
|
|
Set
|
|
.IR errstr .
|