-@c Copyright 2005
-@c Free Software Foundation, Inc.
+@c Copyright (C) 2005-2014 Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@ifset GENERIC
@node Machine Dependencies
@chapter M32C Dependent Features
@end ifclear
-
+
@cindex M32C support
@code{@value{AS}} can assemble code for several different members of
@menu
* M32C-Opts:: M32C Options
+* M32C-Syntax:: M32C Syntax
@end menu
-
+
@node M32C-Opts
@section M32C Options
-
+
@cindex options, M32C
@cindex M32C options
-
-The Renesas M32C version of @code{@value{AS}} has two
+
+The Renesas M32C version of @code{@value{AS}} has these
machine-dependent options:
-
+
@table @code
@item -m32c
@cindex @samp{-m32c} option, M32C
@cindex architecture options, M32C
@cindex M32C architecture option
Assemble M32C instructions.
-
+
@item -m16c
@cindex @samp{-m16c} option, M16C
@cindex architecture options, M16C
@cindex M16C architecture option
Assemble M16C instructions (default).
-
+
+@item -relax
+Enable support for link-time relaxations.
+
+@item -h-tick-hex
+Support H'00 style hex constants in addition to 0x00 style.
+
+
+@end table
+
+@node M32C-Syntax
+@section M32C Syntax
+@menu
+* M32C-Modifiers:: Symbolic Operand Modifiers
+* M32C-Chars:: Special Characters
+@end menu
+
+@node M32C-Modifiers
+@subsection Symbolic Operand Modifiers
+
+@cindex M32C modifiers
+@cindex modifiers, M32C
+
+The assembler supports several modifiers when using symbol addresses
+in M32C instruction operands. The general syntax is the following:
+
+@smallexample
+%modifier(symbol)
+@end smallexample
+
+@table @code
+@cindex symbol modifiers
+
+@item %dsp8
+@itemx %dsp16
+
+These modifiers override the assembler's assumptions about how big a
+symbol's address is. Normally, when it sees an operand like
+@samp{sym[a0]} it assumes @samp{sym} may require the widest
+displacement field (16 bits for @samp{-m16c}, 24 bits for
+@samp{-m32c}). These modifiers tell it to assume the address will fit
+in an 8 or 16 bit (respectively) unsigned displacement. Note that, of
+course, if it doesn't actually fit you will get linker errors. Example:
+
+@smallexample
+mov.w %dsp8(sym)[a0],r1
+mov.b #0,%dsp8(sym)[a0]
+@end smallexample
+
+@item %hi8
+
+This modifier allows you to load bits 16 through 23 of a 24 bit
+address into an 8 bit register. This is useful with, for example, the
+M16C @samp{smovf} instruction, which expects a 20 bit address in
+@samp{r1h} and @samp{a0}. Example:
+
+@smallexample
+mov.b #%hi8(sym),r1h
+mov.w #%lo16(sym),a0
+smovf.b
+@end smallexample
+
+@item %lo16
+
+Likewise, this modifier allows you to load bits 0 through 15 of a 24
+bit address into a 16 bit register.
+
+@item %hi16
+
+This modifier allows you to load bits 16 through 31 of a 32 bit
+address into a 16 bit register. While the M32C family only has 24
+bits of address space, it does support addresses in pairs of 16 bit
+registers (like @samp{a1a0} for the @samp{lde} instruction). This
+modifier is for loading the upper half in such cases. Example:
+
+@smallexample
+mov.w #%hi16(sym),a1
+mov.w #%lo16(sym),a0
+@dots{}
+lde.w [a1a0],r1
+@end smallexample
+
@end table
+
+@node M32C-Chars
+@subsection Special Characters
+
+@cindex line comment character, M32C
+@cindex M32C line comment character
+The presence of a @samp{;} character on a line indicates the start of
+a comment that extends to the end of that line.
+
+If a @samp{#} appears as the first character of a line, the whole line
+is treated as a comment, but in this case the line can also be a
+logical line number directive (@pxref{Comments}) or a
+preprocessor control command (@pxref{Preprocessing}).
+
+@cindex line separator, M32C
+@cindex statement separator, M32C
+@cindex M32C line separator
+The @samp{|} character can be used to separate statements on the same
+line.
projects / deliverable / binutils-gdb.git / blobdiff