| @c Copyright (C) 2005-2016 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 M32C-Dependent |
| @chapter M32C Dependent Features |
| @end ifset |
| @ifclear GENERIC |
| @node Machine Dependencies |
| @chapter M32C Dependent Features |
| @end ifclear |
| |
| @cindex M32C support |
| |
| @code{@value{AS}} can assemble code for several different members of |
| the Renesas M32C family. Normally the default is to assemble code for |
| the M16C microprocessor. The @code{-m32c} option may be used to |
| change the default to the M32C microprocessor. |
| |
| @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 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. |