195 lines
6.9 KiB
Text
195 lines
6.9 KiB
Text
@c Copyright (C) 2010-2022 Free Software Foundation, Inc.
|
|
@c This is part of the GAS manual.
|
|
@c For copying conditions, see the file as.texinfo.
|
|
@c man end
|
|
@ifset GENERIC
|
|
@page
|
|
@node TIC6X-Dependent
|
|
@chapter TIC6X Dependent Features
|
|
@end ifset
|
|
@ifclear GENERIC
|
|
@node Machine Dependencies
|
|
@chapter TIC6X Dependent Features
|
|
@end ifclear
|
|
|
|
@cindex TIC6X support
|
|
@cindex TMS320C6X support
|
|
@menu
|
|
* TIC6X Options:: Options
|
|
* TIC6X Syntax:: Syntax
|
|
* TIC6X Directives:: Directives
|
|
@end menu
|
|
|
|
@node TIC6X Options
|
|
@section TIC6X Options
|
|
@cindex TIC6X options
|
|
@cindex options for TIC6X
|
|
|
|
@c man begin OPTIONS
|
|
@table @gcctabopt
|
|
|
|
@cindex @code{-march=} command-line option, TIC6X
|
|
@item -march=@var{arch}
|
|
Enable (only) instructions from architecture @var{arch}. By default,
|
|
all instructions are permitted.
|
|
|
|
The following values of @var{arch} are accepted: @code{c62x},
|
|
@code{c64x}, @code{c64x+}, @code{c67x}, @code{c67x+}, @code{c674x}.
|
|
|
|
@cindex @code{-mdsbt} command-line option, TIC6X
|
|
@cindex @code{-mno-dsbt} command-line option, TIC6X
|
|
@item -mdsbt
|
|
@itemx -mno-dsbt
|
|
The @option{-mdsbt} option causes the assembler to generate the
|
|
@code{Tag_ABI_DSBT} attribute with a value of 1, indicating that the
|
|
code is using DSBT addressing. The @option{-mno-dsbt} option, the
|
|
default, causes the tag to have a value of 0, indicating that the code
|
|
does not use DSBT addressing. The linker will emit a warning if
|
|
objects of different type (DSBT and non-DSBT) are linked together.
|
|
|
|
@cindex @code{-mpid=} command-line option, TIC6X
|
|
@item -mpid=no
|
|
@itemx -mpid=near
|
|
@itemx -mpid=far
|
|
The @option{-mpid=} option causes the assembler to generate the
|
|
@code{Tag_ABI_PID} attribute with a value indicating the form of data
|
|
addressing used by the code. @option{-mpid=no}, the default,
|
|
indicates position-dependent data addressing, @option{-mpid=near}
|
|
indicates position-independent addressing with GOT accesses using near
|
|
DP addressing, and @option{-mpid=far} indicates position-independent
|
|
addressing with GOT accesses using far DP addressing. The linker will
|
|
emit a warning if objects built with different settings of this option
|
|
are linked together.
|
|
|
|
@cindex @code{-mpic} command-line option, TIC6X
|
|
@cindex @code{-mno-pic} command-line option, TIC6X
|
|
@item -mpic
|
|
@itemx -mno-pic
|
|
The @option{-mpic} option causes the assembler to generate the
|
|
@code{Tag_ABI_PIC} attribute with a value of 1, indicating that the
|
|
code is using position-independent code addressing, The
|
|
@code{-mno-pic} option, the default, causes the tag to have a value of
|
|
0, indicating position-dependent code addressing. The linker will
|
|
emit a warning if objects of different type (position-dependent and
|
|
position-independent) are linked together.
|
|
|
|
@cindex TIC6X big-endian output
|
|
@cindex TIC6X little-endian output
|
|
@cindex big-endian output, TIC6X
|
|
@cindex little-endian output, TIC6X
|
|
@item -mbig-endian
|
|
@itemx -mlittle-endian
|
|
Generate code for the specified endianness. The default is
|
|
little-endian.
|
|
|
|
@end table
|
|
@c man end
|
|
|
|
@node TIC6X Syntax
|
|
@section TIC6X Syntax
|
|
|
|
@cindex line comment character, TIC6X
|
|
@cindex TIC6X line comment character
|
|
The presence of a @samp{;} on a line indicates the start of a comment
|
|
that extends to the end of the current line. If a @samp{#} or
|
|
@samp{*} appears as the first character of a line, the whole line is
|
|
treated as a comment. Note that if a line starts with a @samp{#}
|
|
character then it can also be a logical line number directive
|
|
(@pxref{Comments}) or a preprocessor control command
|
|
(@pxref{Preprocessing}).
|
|
|
|
@cindex line separator, TIC6X
|
|
@cindex statement separator, TIC6X
|
|
@cindex TIC6X line separator
|
|
The @samp{@@} character can be used instead of a newline to separate
|
|
statements.
|
|
|
|
Instruction, register and functional unit names are case-insensitive.
|
|
@command{@value{AS}} requires fully-specified functional unit names,
|
|
such as @samp{.S1}, @samp{.L1X} or @samp{.D1T2}, on all instructions
|
|
using a functional unit.
|
|
|
|
For some instructions, there may be syntactic ambiguity between
|
|
register or functional unit names and the names of labels or other
|
|
symbols. To avoid this, enclose the ambiguous symbol name in
|
|
parentheses; register and functional unit names may not be enclosed in
|
|
parentheses.
|
|
|
|
@node TIC6X Directives
|
|
@section TIC6X Directives
|
|
|
|
@cindex machine directives, TIC6X
|
|
@cindex TIC6X machine directives
|
|
|
|
Directives controlling the set of instructions accepted by the
|
|
assembler have effect for instructions between the directive and any
|
|
subsequent directive overriding it.
|
|
|
|
@table @code
|
|
|
|
@cindex @code{.arch} directive, TIC6X
|
|
@item .arch @var{arch}
|
|
This has the same effect as @option{-march=@var{arch}}.
|
|
|
|
@cindex @code{.cantunwind} directive, TIC6X
|
|
@item .cantunwind
|
|
Prevents unwinding through the current function. No personality routine
|
|
or exception table data is required or permitted.
|
|
|
|
If this is not specified then frame unwinding information will be
|
|
constructed from CFI directives. @pxref{CFI directives}.
|
|
|
|
@cindex @code{.c6xabi_attribute} directive, TIC6X
|
|
@item .c6xabi_attribute @var{tag}, @var{value}
|
|
Set the C6000 EABI build attribute @var{tag} to @var{value}.
|
|
|
|
The @var{tag} is either an attribute number or one of
|
|
@code{Tag_ISA}, @code{Tag_ABI_wchar_t},
|
|
@code{Tag_ABI_stack_align_needed},
|
|
@code{Tag_ABI_stack_align_preserved}, @code{Tag_ABI_DSBT},
|
|
@code{Tag_ABI_PID}, @code{Tag_ABI_PIC},
|
|
@code{TAG_ABI_array_object_alignment},
|
|
@code{TAG_ABI_array_object_align_expected},
|
|
@code{Tag_ABI_compatibility} and @code{Tag_ABI_conformance}. The
|
|
@var{value} is either a @code{number}, @code{"string"}, or
|
|
@code{number, "string"} depending on the tag.
|
|
|
|
@cindex @code{.ehtype} directive, TIC6X
|
|
@item .ehtype @var{symbol}
|
|
Output an exception type table reference to @var{symbol}.
|
|
|
|
@cindex @code{.endp} directive, TIC6X
|
|
@item .endp
|
|
Marks the end of and exception table or function. If preceded by a
|
|
@code{.handlerdata} directive then this also switched back to the previous
|
|
text section.
|
|
|
|
@cindex @code{.handlerdata} directive, TIC6X
|
|
@item .handlerdata
|
|
Marks the end of the current function, and the start of the exception table
|
|
entry for that function. Anything between this directive and the
|
|
@code{.endp} directive will be added to the exception table entry.
|
|
|
|
Must be preceded by a CFI block containing a @code{.cfi_lsda} directive.
|
|
|
|
@cindex @code{.nocmp} directive, TIC6X
|
|
@item .nocmp
|
|
Disallow use of C64x+ compact instructions in the current text
|
|
section.
|
|
|
|
@cindex @code{.personalityindex} directive, TIC6X
|
|
@item .personalityindex @var{index}
|
|
Sets the personality routine for the current function to the ABI specified
|
|
compact routine number @var{index}
|
|
|
|
@cindex @code{.personality} directive, TIC6X
|
|
@item .personality @var{name}
|
|
Sets the personality routine for the current function to @var{name}.
|
|
|
|
@cindex @code{.scomm} directive, TIC6X
|
|
@item .scomm @var{symbol}, @var{size}, @var{align}
|
|
Like @code{.comm}, creating a common symbol @var{symbol} with size @var{size}
|
|
and alignment @var{align}, but unlike when using @code{.comm}, this symbol
|
|
will be placed into the small BSS section by the linker.
|
|
|
|
@end table
|