| 1 | @c Copyright (C) 2005-2016 Free Software Foundation, Inc. |
| 2 | @c This is part of the GAS manual. |
| 3 | @c For copying conditions, see the file as.texinfo. |
| 4 | @ifset GENERIC |
| 5 | @page |
| 6 | @node M32C-Dependent |
| 7 | @chapter M32C Dependent Features |
| 8 | @end ifset |
| 9 | @ifclear GENERIC |
| 10 | @node Machine Dependencies |
| 11 | @chapter M32C Dependent Features |
| 12 | @end ifclear |
| 13 | |
| 14 | @cindex M32C support |
| 15 | |
| 16 | @code{@value{AS}} can assemble code for several different members of |
| 17 | the Renesas M32C family. Normally the default is to assemble code for |
| 18 | the M16C microprocessor. The @code{-m32c} option may be used to |
| 19 | change the default to the M32C microprocessor. |
| 20 | |
| 21 | @menu |
| 22 | * M32C-Opts:: M32C Options |
| 23 | * M32C-Syntax:: M32C Syntax |
| 24 | @end menu |
| 25 | |
| 26 | @node M32C-Opts |
| 27 | @section M32C Options |
| 28 | |
| 29 | @cindex options, M32C |
| 30 | @cindex M32C options |
| 31 | |
| 32 | The Renesas M32C version of @code{@value{AS}} has these |
| 33 | machine-dependent options: |
| 34 | |
| 35 | @table @code |
| 36 | @item -m32c |
| 37 | @cindex @samp{-m32c} option, M32C |
| 38 | @cindex architecture options, M32C |
| 39 | @cindex M32C architecture option |
| 40 | Assemble M32C instructions. |
| 41 | |
| 42 | @item -m16c |
| 43 | @cindex @samp{-m16c} option, M16C |
| 44 | @cindex architecture options, M16C |
| 45 | @cindex M16C architecture option |
| 46 | Assemble M16C instructions (default). |
| 47 | |
| 48 | @item -relax |
| 49 | Enable support for link-time relaxations. |
| 50 | |
| 51 | @item -h-tick-hex |
| 52 | Support H'00 style hex constants in addition to 0x00 style. |
| 53 | |
| 54 | |
| 55 | @end table |
| 56 | |
| 57 | @node M32C-Syntax |
| 58 | @section M32C Syntax |
| 59 | @menu |
| 60 | * M32C-Modifiers:: Symbolic Operand Modifiers |
| 61 | * M32C-Chars:: Special Characters |
| 62 | @end menu |
| 63 | |
| 64 | @node M32C-Modifiers |
| 65 | @subsection Symbolic Operand Modifiers |
| 66 | |
| 67 | @cindex M32C modifiers |
| 68 | @cindex modifiers, M32C |
| 69 | |
| 70 | The assembler supports several modifiers when using symbol addresses |
| 71 | in M32C instruction operands. The general syntax is the following: |
| 72 | |
| 73 | @smallexample |
| 74 | %modifier(symbol) |
| 75 | @end smallexample |
| 76 | |
| 77 | @table @code |
| 78 | @cindex symbol modifiers |
| 79 | |
| 80 | @item %dsp8 |
| 81 | @itemx %dsp16 |
| 82 | |
| 83 | These modifiers override the assembler's assumptions about how big a |
| 84 | symbol's address is. Normally, when it sees an operand like |
| 85 | @samp{sym[a0]} it assumes @samp{sym} may require the widest |
| 86 | displacement field (16 bits for @samp{-m16c}, 24 bits for |
| 87 | @samp{-m32c}). These modifiers tell it to assume the address will fit |
| 88 | in an 8 or 16 bit (respectively) unsigned displacement. Note that, of |
| 89 | course, if it doesn't actually fit you will get linker errors. Example: |
| 90 | |
| 91 | @smallexample |
| 92 | mov.w %dsp8(sym)[a0],r1 |
| 93 | mov.b #0,%dsp8(sym)[a0] |
| 94 | @end smallexample |
| 95 | |
| 96 | @item %hi8 |
| 97 | |
| 98 | This modifier allows you to load bits 16 through 23 of a 24 bit |
| 99 | address into an 8 bit register. This is useful with, for example, the |
| 100 | M16C @samp{smovf} instruction, which expects a 20 bit address in |
| 101 | @samp{r1h} and @samp{a0}. Example: |
| 102 | |
| 103 | @smallexample |
| 104 | mov.b #%hi8(sym),r1h |
| 105 | mov.w #%lo16(sym),a0 |
| 106 | smovf.b |
| 107 | @end smallexample |
| 108 | |
| 109 | @item %lo16 |
| 110 | |
| 111 | Likewise, this modifier allows you to load bits 0 through 15 of a 24 |
| 112 | bit address into a 16 bit register. |
| 113 | |
| 114 | @item %hi16 |
| 115 | |
| 116 | This modifier allows you to load bits 16 through 31 of a 32 bit |
| 117 | address into a 16 bit register. While the M32C family only has 24 |
| 118 | bits of address space, it does support addresses in pairs of 16 bit |
| 119 | registers (like @samp{a1a0} for the @samp{lde} instruction). This |
| 120 | modifier is for loading the upper half in such cases. Example: |
| 121 | |
| 122 | @smallexample |
| 123 | mov.w #%hi16(sym),a1 |
| 124 | mov.w #%lo16(sym),a0 |
| 125 | @dots{} |
| 126 | lde.w [a1a0],r1 |
| 127 | @end smallexample |
| 128 | |
| 129 | @end table |
| 130 | |
| 131 | @node M32C-Chars |
| 132 | @subsection Special Characters |
| 133 | |
| 134 | @cindex line comment character, M32C |
| 135 | @cindex M32C line comment character |
| 136 | The presence of a @samp{;} character on a line indicates the start of |
| 137 | a comment that extends to the end of that line. |
| 138 | |
| 139 | If a @samp{#} appears as the first character of a line, the whole line |
| 140 | is treated as a comment, but in this case the line can also be a |
| 141 | logical line number directive (@pxref{Comments}) or a |
| 142 | preprocessor control command (@pxref{Preprocessing}). |
| 143 | |
| 144 | @cindex line separator, M32C |
| 145 | @cindex statement separator, M32C |
| 146 | @cindex M32C line separator |
| 147 | The @samp{|} character can be used to separate statements on the same |
| 148 | line. |