195 lines
6.9 KiB
Text
195 lines
6.9 KiB
Text
@c Copyright 2010, 2011 Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@c man end
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@ifset GENERIC
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@page
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@node TIC6X-Dependent
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@chapter TIC6X Dependent Features
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@end ifset
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@ifclear GENERIC
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@node Machine Dependencies
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@chapter TIC6X Dependent Features
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@end ifclear
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@cindex TIC6X support
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@cindex TMS320C6X support
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@menu
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* TIC6X Options:: Options
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* TIC6X Syntax:: Syntax
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* TIC6X Directives:: Directives
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@end menu
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@node TIC6X Options
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@section TIC6X Options
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@cindex TIC6X options
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@cindex options for TIC6X
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@c man begin OPTIONS
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@table @gcctabopt
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@cindex @code{-march=} command line option, TIC6X
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@item -march=@var{arch}
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Enable (only) instructions from architecture @var{arch}. By default,
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all instructions are permitted.
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The following values of @var{arch} are accepted: @code{c62x},
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@code{c64x}, @code{c64x+}, @code{c67x}, @code{c67x+}, @code{c674x}.
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@cindex @code{-mdsbt} command line option, TIC6X
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@cindex @code{-mno-dsbt} command line option, TIC6X
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@item -mdsbt
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@itemx -mno-dsbt
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The @option{-mdsbt} option causes the assembler to generate the
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@code{Tag_ABI_DSBT} attribute with a value of 1, indicating that the
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code is using DSBT addressing. The @option{-mno-dsbt} option, the
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default, causes the tag to have a value of 0, indicating that the code
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does not use DSBT addressing. The linker will emit a warning if
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objects of different type (DSBT and non-DSBT) are linked together.
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@cindex @code{-mpid=} command line option, TIC6X
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@item -mpid=no
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@itemx -mpid=near
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@itemx -mpid=far
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The @option{-mpid=} option causes the assembler to generate the
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@code{Tag_ABI_PID} attribute with a value indicating the form of data
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addressing used by the code. @option{-mpid=no}, the default,
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indicates position-dependent data addressing, @option{-mpid=near}
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indicates position-independent addressing with GOT accesses using near
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DP addressing, and @option{-mpid=far} indicates position-independent
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addressing with GOT accesses using far DP addressing. The linker will
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emit a warning if objects built with different settings of this option
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are linked together.
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@cindex @code{-mpic} command line option, TIC6X
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@cindex @code{-mno-pic} command line option, TIC6X
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@item -mpic
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@itemx -mno-pic
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The @option{-mpic} option causes the assembler to generate the
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@code{Tag_ABI_PIC} attribute with a value of 1, indicating that the
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code is using position-independent code addressing, The
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@code{-mno-pic} option, the default, causes the tag to have a value of
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0, indicating position-dependent code addressing. The linker will
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emit a warning if objects of different type (position-dependent and
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position-independent) are linked together.
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@cindex TIC6X big-endian output
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@cindex TIC6X little-endian output
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@cindex big-endian output, TIC6X
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@cindex little-endian output, TIC6X
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@item -mbig-endian
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@itemx -mlittle-endian
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Generate code for the specified endianness. The default is
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little-endian.
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@end table
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@c man end
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@node TIC6X Syntax
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@section TIC6X Syntax
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@cindex line comment character, TIC6X
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@cindex TIC6X line comment character
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The presence of a @samp{;} on a line indicates the start of a comment
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that extends to the end of the current line. If a @samp{#} or
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@samp{*} appears as the first character of a line, the whole line is
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treated as a comment. Note that if a line starts with a @samp{#}
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character then it can also be a logical line number directive
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(@pxref{Comments}) or a preprocessor control command
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(@pxref{Preprocessing}).
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@cindex line separator, TIC6X
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@cindex statement separator, TIC6X
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@cindex TIC6X line separator
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The @samp{@@} character can be used instead of a newline to separate
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statements.
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Instruction, register and functional unit names are case-insensitive.
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@command{@value{AS}} requires fully-specified functional unit names,
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such as @samp{.S1}, @samp{.L1X} or @samp{.D1T2}, on all instructions
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using a functional unit.
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For some instructions, there may be syntactic ambiguity between
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register or functional unit names and the names of labels or other
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symbols. To avoid this, enclose the ambiguous symbol name in
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parentheses; register and functional unit names may not be enclosed in
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parentheses.
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@node TIC6X Directives
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@section TIC6X Directives
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@cindex machine directives, TIC6X
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@cindex TIC6X machine directives
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Directives controlling the set of instructions accepted by the
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assembler have effect for instructions between the directive and any
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subsequent directive overriding it.
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@table @code
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@cindex @code{.arch} directive, TIC6X
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@item .arch @var{arch}
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This has the same effect as @option{-march=@var{arch}}.
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@cindex @code{.cantunwind} directive, TIC6X
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@item .cantunwind
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Prevents unwinding through the current function. No personality routine
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or exception table data is required or permitted.
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If this is not specified then frame unwinding information will be
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constructed from CFI directives. @pxref{CFI directives}.
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@cindex @code{.c6xabi_attribute} directive, TIC6X
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@item .c6xabi_attribute @var{tag}, @var{value}
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Set the C6000 EABI build attribute @var{tag} to @var{value}.
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The @var{tag} is either an attribute number or one of
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@code{Tag_ISA}, @code{Tag_ABI_wchar_t},
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@code{Tag_ABI_stack_align_needed},
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@code{Tag_ABI_stack_align_preserved}, @code{Tag_ABI_DSBT},
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@code{Tag_ABI_PID}, @code{Tag_ABI_PIC},
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@code{TAG_ABI_array_object_alignment},
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@code{TAG_ABI_array_object_align_expected},
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@code{Tag_ABI_compatibility} and @code{Tag_ABI_conformance}. The
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@var{value} is either a @code{number}, @code{"string"}, or
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@code{number, "string"} depending on the tag.
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@cindex @code{.ehtype} directive, TIC6X
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@item .ehtype @var{symbol}
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Output an exception type table reference to @var{symbol}.
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@cindex @code{.endp} directive, TIC6X
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@item .endp
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Marks the end of and exception table or function. If preceeded by a
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@code{.handlerdata} directive then this also switched back to the previous
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text section.
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@cindex @code{.handlerdata} directive, TIC6X
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@item .handlerdata
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Marks the end of the current function, and the start of the exception table
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entry for that function. Anything between this directive and the
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@code{.endp} directive will be added to the exception table entry.
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Must be preceded by a CFI block containing a @code{.cfi_lsda} directive.
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@cindex @code{.nocmp} directive, TIC6X
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@item .nocmp
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Disallow use of C64x+ compact instructions in the current text
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section.
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@cindex @code{.personalityindex} directive, TIC6X
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@item .personalityindex @var{index}
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Sets the personality routine for the current function to the ABI specified
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compact routine number @var{index}
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@cindex @code{.personality} directive, TIC6X
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@item .personality @var{name}
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Sets the personality routine for the current function to @var{name}.
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@cindex @code{.scomm} directive, TIC6X
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@item .scomm @var{symbol}, @var{size}, @var{align}
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Like @code{.comm}, creating a common symbol @var{symbol} with size @var{size}
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and alignment @var{align}, but unlike when using @code{.comm}, this symbol
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will be placed into the small BSS section by the linker.
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@end table
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