diff options
Diffstat (limited to 'gas/doc/c-arm.texi')
| -rw-r--r-- | gas/doc/c-arm.texi | 416 |
1 files changed, 0 insertions, 416 deletions
diff --git a/gas/doc/c-arm.texi b/gas/doc/c-arm.texi deleted file mode 100644 index 022faa00bf9..00000000000 --- a/gas/doc/c-arm.texi +++ /dev/null @@ -1,416 +0,0 @@ -@c Copyright 1996, 1997, 1998, 1999, 2000, 2001 -@c Free Software Foundation, Inc. -@c This is part of the GAS manual. -@c For copying conditions, see the file as.texinfo. - -@ifset GENERIC -@page -@node ARM-Dependent -@chapter ARM Dependent Features -@end ifset - -@ifclear GENERIC -@node Machine Dependencies -@chapter ARM Dependent Features -@end ifclear - -@cindex ARM support -@cindex Thumb support -@menu -* ARM Options:: Options -* ARM Syntax:: Syntax -* ARM Floating Point:: Floating Point -* ARM Directives:: ARM Machine Directives -* ARM Opcodes:: Opcodes -@end menu - -@node ARM Options -@section Options -@cindex ARM options (none) -@cindex options for ARM (none) - -@table @code - -@cindex @code{-mcpu=} command line option, ARM -@item -mcpu=@var{processor}[+@var{extension}@dots{}] -This option specifies the target processor. The assembler will issue an -error message if an attempt is made to assemble an instruction which -will not execute on the target processor. The following processor names are -recognized: -@code{arm1}, -@code{arm2}, -@code{arm250}, -@code{arm3}, -@code{arm6}, -@code{arm60}, -@code{arm600}, -@code{arm610}, -@code{arm620}, -@code{arm7}, -@code{arm7m}, -@code{arm7d}, -@code{arm7dm}, -@code{arm7di}, -@code{arm7dmi}, -@code{arm70}, -@code{arm700}, -@code{arm700i}, -@code{arm710}, -@code{arm710t}, -@code{arm720}, -@code{arm720t}, -@code{arm740t}, -@code{arm710c}, -@code{arm7100}, -@code{arm7500}, -@code{arm7500fe}, -@code{arm7t}, -@code{arm7tdmi}, -@code{arm8}, -@code{arm810}, -@code{strongarm}, -@code{strongarm1}, -@code{strongarm110}, -@code{strongarm1100}, -@code{strongarm1110}, -@code{arm9}, -@code{arm920}, -@code{arm920t}, -@code{arm922t}, -@code{arm940t}, -@code{arm9tdmi}, -@code{arm9e}, -@code{arm946e-r0}, -@code{arm946e}, -@code{arm966e-r0}, -@code{arm966e}, -@code{arm10t}, -@code{arm10e}, -@code{arm1020}, -@code{arm1020t}, -@code{arm1020e}, -@code{ep9312} (ARM920 with Cirrus Maverick coprocessor), -@code{i80200} (Intel XScale processor) -and -@code{xscale}. -The special name @code{all} may be used to allow the -assembler to accept instructions valid for any ARM processor. - -In addition to the basic instruction set, the assembler can be told to -accept various extension mnemonics that extend the processor using the -co-processor instruction space. For example, @code{-mcpu=arm920+maverick} -is equivalent to specifying @code{-mcpu=ep9312}. The following extensions -are currently supported: -@code{+maverick} -and -@code{+xscale}. - -@cindex @code{-march=} command line option, ARM -@item -march=@var{architecture}[+@var{extension}@dots{}] -This option specifies the target architecture. The assembler will issue -an error message if an attempt is made to assemble an instruction which -will not execute on the target architecture. The following architecture -names are recognized: -@code{armv1}, -@code{armv2}, -@code{armv2a}, -@code{armv2s}, -@code{armv3}, -@code{armv3m}, -@code{armv4}, -@code{armv4xm}, -@code{armv4t}, -@code{armv4txm}, -@code{armv5}, -@code{armv5t}, -@code{armv5txm}, -@code{armv5te}, -@code{armv5texp} -and -@code{xscale}. -If both @code{-mcpu} and -@code{-march} are specified, the assembler will use -the setting for @code{-mcpu}. - -The architecture option can be extended with the same instruction set -extension options as the @code{-mcpu} option. - -@cindex @code{-mfpu=} command line option, ARM -@item -mfpu=@var{floating-point-format} - -This option specifies the floating point format to assemble for. The -assembler will issue an error message if an attempt is made to assemble -an instruction which will not execute on the target floating point unit. -The following format options are recognized: -@code{softfpa}, -@code{fpe}, -@code{fpe2}, -@code{fpe3}, -@code{fpa}, -@code{fpa10}, -@code{fpa11}, -@code{arm7500fe}, -@code{softvfp}, -@code{softvfp+vfp}, -@code{vfp}, -@code{vfp10}, -@code{vfp10-r0}, -@code{vfp9}, -@code{vfpxd}, -@code{arm1020t} -and -@code{arm1020e}. - -In addition to determining which instructions are assembled, this option -also affects the way in which the @code{.double} assembler directive behaves -when assembling little-endian code. - -The default is dependent on the processor selected. For Architecture 5 or -later, the default is to assembler for VFP instructions; for earlier -architectures the default is to assemble for FPA instructions. - -@cindex @code{-mthumb} command line option, ARM -@item -mthumb -This option specifies that the assembler should start assembling Thumb -instructions; that is, it should behave as though the file starts with a -@code{.code 16} directive. - -@cindex @code{-mthumb-interwork} command line option, ARM -@item -mthumb-interwork -This option specifies that the output generated by the assembler should -be marked as supporting interworking. - -@cindex @code{-mapcs} command line option, ARM -@item -mapcs @code{[26|32]} -This option specifies that the output generated by the assembler should -be marked as supporting the indicated version of the Arm Procedure. -Calling Standard. - -@cindex @code{-matpcs} command line option, ARM -@item -matpcs -This option specifies that the output generated by the assembler should -be marked as supporting the Arm/Thumb Procedure Calling Standard. If -enabled this option will cause the assembler to create an empty -debugging section in the object file called .arm.atpcs. Debuggers can -use this to determine the ABI being used by. - -@cindex @code{-mapcs-float} command line option, ARM -@item -mapcs-float -This indicates the the floating point variant of the APCS should be -used. In this variant floating point arguments are passed in FP -registers rather than integer registers. - -@cindex @code{-mapcs-reentrant} command line option, ARM -@item -mapcs-reentrant -This indicates that the reentrant variant of the APCS should be used. -This variant supports position independent code. - -@cindex @code{-EB} command line option, ARM -@item -EB -This option specifies that the output generated by the assembler should -be marked as being encoded for a big-endian processor. - -@cindex @code{-EL} command line option, ARM -@item -EL -This option specifies that the output generated by the assembler should -be marked as being encoded for a little-endian processor. - -@cindex @code{-k} command line option, ARM -@cindex PIC code generation for ARM -@item -k -This option specifies that the output of the assembler should be marked -as position-independent code (PIC). - -@cindex @code{-moabi} command line option, ARM -@item -moabi -This indicates that the code should be assembled using the old ARM ELF -conventions, based on a beta release release of the ARM-ELF -specifications, rather than the default conventions which are based on -the final release of the ARM-ELF specifications. - -@end table - - -@node ARM Syntax -@section Syntax -@menu -* ARM-Chars:: Special Characters -* ARM-Regs:: Register Names -@end menu - -@node ARM-Chars -@subsection Special Characters - -@cindex line comment character, ARM -@cindex ARM 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{#} appears as -the first character of a line, the whole line is treated as a comment. - -@cindex line separator, ARM -@cindex statement separator, ARM -@cindex ARM line separator -The @samp{;} character can be used instead of a newline to separate -statements. - -@cindex immediate character, ARM -@cindex ARM immediate character -Either @samp{#} or @samp{$} can be used to indicate immediate operands. - -@cindex identifiers, ARM -@cindex ARM identifiers -*TODO* Explain about /data modifier on symbols. - -@node ARM-Regs -@subsection Register Names - -@cindex ARM register names -@cindex register names, ARM -*TODO* Explain about ARM register naming, and the predefined names. - -@node ARM Floating Point -@section Floating Point - -@cindex floating point, ARM (@sc{ieee}) -@cindex ARM floating point (@sc{ieee}) -The ARM family uses @sc{ieee} floating-point numbers. - - - -@node ARM Directives -@section ARM Machine Directives - -@cindex machine directives, ARM -@cindex ARM machine directives -@table @code - -@cindex @code{align} directive, ARM -@item .align @var{expression} [, @var{expression}] -This is the generic @var{.align} directive. For the ARM however if the -first argument is zero (ie no alignment is needed) the assembler will -behave as if the argument had been 2 (ie pad to the next four byte -boundary). This is for compatability with ARM's own assembler. - -@cindex @code{req} directive, ARM -@item @var{name} .req @var{register name} -This creates an alias for @var{register name} called @var{name}. For -example: - -@smallexample - foo .req r0 -@end smallexample - -@cindex @code{code} directive, ARM -@item .code @code{[16|32]} -This directive selects the instruction set being generated. The value 16 -selects Thumb, with the value 32 selecting ARM. - -@cindex @code{thumb} directive, ARM -@item .thumb -This performs the same action as @var{.code 16}. - -@cindex @code{arm} directive, ARM -@item .arm -This performs the same action as @var{.code 32}. - -@cindex @code{force_thumb} directive, ARM -@item .force_thumb -This directive forces the selection of Thumb instructions, even if the -target processor does not support those instructions - -@cindex @code{thumb_func} directive, ARM -@item .thumb_func -This directive specifies that the following symbol is the name of a -Thumb encoded function. This information is necessary in order to allow -the assembler and linker to generate correct code for interworking -between Arm and Thumb instructions and should be used even if -interworking is not going to be performed. The presence of this -directive also implies @code{.thumb} - -@cindex @code{thumb_set} directive, ARM -@item .thumb_set -This performs the equivalent of a @code{.set} directive in that it -creates a symbol which is an alias for another symbol (possibly not yet -defined). This directive also has the added property in that it marks -the aliased symbol as being a thumb function entry point, in the same -way that the @code{.thumb_func} directive does. - -@cindex @code{.ltorg} directive, ARM -@item .ltorg -This directive causes the current contents of the literal pool to be -dumped into the current section (which is assumed to be the .text -section) at the current location (aligned to a word boundary). - -@cindex @code{.pool} directive, ARM -@item .pool -This is a synonym for .ltorg. - -@end table - -@node ARM Opcodes -@section Opcodes - -@cindex ARM opcodes -@cindex opcodes for ARM -@code{@value{AS}} implements all the standard ARM opcodes. It also -implements several pseudo opcodes, including several synthetic load -instructions. - -@table @code - -@cindex @code{NOP} pseudo op, ARM -@item NOP -@smallexample - nop -@end smallexample - -This pseudo op will always evaluate to a legal ARM instruction that does -nothing. Currently it will evaluate to MOV r0, r0. - -@cindex @code{LDR reg,=<label>} pseudo op, ARM -@item LDR -@smallexample - ldr <register> , = <expression> -@end smallexample - -If expression evaluates to a numeric constant then a MOV or MVN -instruction will be used in place of the LDR instruction, if the -constant can be generated by either of these instructions. Otherwise -the constant will be placed into the nearest literal pool (if it not -already there) and a PC relative LDR instruction will be generated. - -@cindex @code{ADR reg,<label>} pseudo op, ARM -@item ADR -@smallexample - adr <register> <label> -@end smallexample - -This instruction will load the address of @var{label} into the indicated -register. The instruction will evaluate to a PC relative ADD or SUB -instruction depending upon where the label is located. If the label is -out of range, or if it is not defined in the same file (and section) as -the ADR instruction, then an error will be generated. This instruction -will not make use of the literal pool. - -@cindex @code{ADRL reg,<label>} pseudo op, ARM -@item ADRL -@smallexample - adrl <register> <label> -@end smallexample - -This instruction will load the address of @var{label} into the indicated -register. The instruction will evaluate to one or two PC relative ADD -or SUB instructions depending upon where the label is located. If a -second instruction is not needed a NOP instruction will be generated in -its place, so that this instruction is always 8 bytes long. - -If the label is out of range, or if it is not defined in the same file -(and section) as the ADRL instruction, then an error will be generated. -This instruction will not make use of the literal pool. - -@end table - -For information on the ARM or Thumb instruction sets, see @cite{ARM -Software Development Toolkit Reference Manual}, Advanced RISC Machines -Ltd. - |