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518 lines
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518 lines
17 KiB
Plaintext
@c Copyright (C) 2006-2020 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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@ifset GENERIC
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@page
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@node AVR-Dependent
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@chapter AVR 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 AVR Dependent Features
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@end ifclear
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@cindex AVR support
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@menu
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* AVR Options:: Options
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* AVR Syntax:: Syntax
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* AVR Opcodes:: Opcodes
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* AVR Pseudo Instructions:: Pseudo Instructions
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@end menu
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@node AVR Options
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@section Options
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@cindex AVR options (none)
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@cindex options for AVR (none)
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@table @code
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@cindex @code{-mmcu=} command-line option, AVR
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@item -mmcu=@var{mcu}
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Specify ATMEL AVR instruction set or MCU type.
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Instruction set avr1 is for the minimal AVR core, not supported by the C
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compiler, only for assembler programs (MCU types: at90s1200,
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attiny11, attiny12, attiny15, attiny28).
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Instruction set avr2 (default) is for the classic AVR core with up to
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8K program memory space (MCU types: at90s2313, at90s2323, at90s2333, at90s2343,
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attiny22, attiny26, at90s4414, at90s4433, at90s4434, at90s8515, at90c8534,
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at90s8535).
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Instruction set avr25 is for the classic AVR core with up to 8K program memory
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space plus the MOVW instruction (MCU types: attiny13, attiny13a, attiny2313,
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attiny2313a, attiny24, attiny24a, attiny4313, attiny44, attiny44a, attiny84,
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attiny84a, attiny25, attiny45, attiny85, attiny261, attiny261a, attiny461,
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attiny461a, attiny861, attiny861a, attiny87, attiny43u, attiny48, attiny88,
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attiny828, at86rf401, ata6289, ata5272).
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Instruction set avr3 is for the classic AVR core with up to 128K program
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memory space (MCU types: at43usb355, at76c711).
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Instruction set avr31 is for the classic AVR core with exactly 128K program
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memory space (MCU types: atmega103, at43usb320).
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Instruction set avr35 is for classic AVR core plus MOVW, CALL, and JMP
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instructions (MCU types: attiny167, attiny1634, at90usb82, at90usb162,
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atmega8u2, atmega16u2, atmega32u2, ata5505).
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Instruction set avr4 is for the enhanced AVR core with up to 8K program
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memory space (MCU types: atmega48, atmega48a, atmega48pa, atmega48p, atmega8,
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atmega8a, atmega88, atmega88a, atmega88p, atmega88pa, atmega8515, atmega8535,
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atmega8hva, at90pwm1, at90pwm2, at90pwm2b, at90pwm3, at90pwm3b, at90pwm81,
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ata6285, ata6286).
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Instruction set avr5 is for the enhanced AVR core with up to 128K program
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memory space (MCU types: at90pwm161, atmega16, atmega16a, atmega161, atmega162,
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atmega163, atmega164a, atmega164p, atmega164pa, atmega165, atmega165a,
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atmega165p, atmega165pa, atmega168, atmega168a, atmega168p, atmega168pa,
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atmega169, atmega169a, atmega169p, atmega169pa, atmega32, atmega323, atmega324a,
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atmega324p, atmega324pa, atmega325, atmega325a, atmega32, atmega32a, atmega323,
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atmega324a, atmega324p, atmega324pa, atmega325, atmega325a, atmega325p,
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atmega325p, atmega325pa, atmega3250, atmega3250a, atmega3250p, atmega3250pa,
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atmega328, atmega328p, atmega329, atmega329a, atmega329p, atmega329pa,
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atmega3290a, atmega3290p, atmega3290pa, atmega406, atmega64, atmega64a,
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atmega64rfr2, atmega644rfr2, atmega640, atmega644, atmega644a, atmega644p,
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atmega644pa, atmega645, atmega645a, atmega645p, atmega6450, atmega6450a,
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atmega6450p, atmega649, atmega649a, atmega649p, atmega6490, atmega6490a,
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atmega6490p, atmega16hva, atmega16hva2, atmega16hvb, atmega16hvbrevb,
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atmega32hvb, atmega32hvbrevb, atmega64hve, at90can32, at90can64, at90pwm161,
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at90pwm216, at90pwm316, atmega32c1, atmega64c1, atmega16m1, atmega32m1,
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atmega64m1, atmega16u4, atmega32u4, atmega32u6, at90usb646, at90usb647, at94k,
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at90scr100, ata5790, ata5795).
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Instruction set avr51 is for the enhanced AVR core with exactly 128K
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program memory space (MCU types: atmega128, atmega128a, atmega1280,
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atmega1281, atmega1284, atmega1284p, atmega128rfa1, atmega128rfr2,
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atmega1284rfr2, at90can128, at90usb1286, at90usb1287, m3000).
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Instruction set avr6 is for the enhanced AVR core with a 3-byte PC
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(MCU types: atmega2560, atmega2561, atmega256rfr2, atmega2564rfr2).
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Instruction set avrxmega2 is for the XMEGA AVR core with 8K to 64K
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program memory space and less than 64K data space (MCU types:
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atxmega16a4, atxmega16a4u, atxmega16c4, atxmega16d4, atxmega16x1,
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atxmega32a4, atxmega32a4u, atxmega32c4, atxmega32d4, atxmega16e5,
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atxmega8e5, atxmega32e5, atxmega32x1).
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Instruction set avrxmega3 is for the XMEGA AVR core with up to 64K
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of combined program memory and RAM, and with program memory
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visible in the RAM address space (MCU types:
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attiny212, attiny214, attiny412, attiny414, attiny416, attiny417,
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attiny814, attiny816, attiny817, attiny1614, attiny1616, attiny1617,
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attiny3214, attiny3216, attiny3217).
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Instruction set avrxmega4 is for the XMEGA AVR core with up to 64K
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program memory space and less than 64K data space (MCU types:
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atxmega64a3, atxmega64a3u, atxmega64a4u, atxmega64b1, atxmega64b3,
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atxmega64c3, atxmega64d3, atxmega64d4).
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Instruction set avrxmega5 is for the XMEGA AVR core with up to 64K
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program memory space and greater than 64K data space (MCU types:
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atxmega64a1, atxmega64a1u).
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Instruction set avrxmega6 is for the XMEGA AVR core with larger than
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64K program memory space and less than 64K data space (MCU types:
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atxmega128a3, atxmega128a3u, atxmega128c3, atxmega128d3, atxmega128d4,
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atxmega192a3, atxmega192a3u, atxmega128b1, atxmega128b3, atxmega192c3,
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atxmega192d3, atxmega256a3, atxmega256a3u, atxmega256a3b,
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atxmega256a3bu, atxmega256c3, atxmega256d3, atxmega384c3,
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atxmega256d3).
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Instruction set avrxmega7 is for the XMEGA AVR core with larger than
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64K program memory space and greater than 64K data space (MCU types:
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atxmega128a1, atxmega128a1u, atxmega128a4u).
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Instruction set avrtiny is for the ATtiny4/5/9/10/20/40
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microcontrollers.
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@cindex @code{-mall-opcodes} command-line option, AVR
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@item -mall-opcodes
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Accept all AVR opcodes, even if not supported by @code{-mmcu}.
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@cindex @code{-mno-skip-bug} command-line option, AVR
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@item -mno-skip-bug
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This option disable warnings for skipping two-word instructions.
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@cindex @code{-mno-wrap} command-line option, AVR
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@item -mno-wrap
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This option reject @code{rjmp/rcall} instructions with 8K wrap-around.
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@cindex @code{-mrmw} command-line option, AVR
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@item -mrmw
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Accept Read-Modify-Write (@code{XCH,LAC,LAS,LAT}) instructions.
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@cindex @code{-mlink-relax} command-line option, AVR
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@item -mlink-relax
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Enable support for link-time relaxation. This is now on by default
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and this flag no longer has any effect.
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@cindex @code{-mno-link-relax} command-line option, AVR
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@item -mno-link-relax
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Disable support for link-time relaxation. The assembler will resolve
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relocations when it can, and may be able to better compress some debug
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information.
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@cindex @code{-mgcc-isr} command-line option, AVR
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@item -mgcc-isr
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Enable the @code{__gcc_isr} pseudo instruction.
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@end table
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@node AVR Syntax
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@section Syntax
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@menu
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* AVR-Chars:: Special Characters
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* AVR-Regs:: Register Names
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* AVR-Modifiers:: Relocatable Expression Modifiers
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@end menu
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@node AVR-Chars
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@subsection Special Characters
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@cindex line comment character, AVR
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@cindex AVR line comment character
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The presence of a @samp{;} anywhere on a line indicates the start of a
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comment that extends to the end of that line.
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If a @samp{#} appears as the first character of a line, the whole line
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is treated as a comment, but in this case the line can also be a
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logical line number directive (@pxref{Comments}) or a preprocessor
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control command (@pxref{Preprocessing}).
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@cindex line separator, AVR
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@cindex statement separator, AVR
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@cindex AVR 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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@node AVR-Regs
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@subsection Register Names
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@cindex AVR register names
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@cindex register names, AVR
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The AVR has 32 x 8-bit general purpose working registers @samp{r0},
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@samp{r1}, ... @samp{r31}.
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Six of the 32 registers can be used as three 16-bit indirect address
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register pointers for Data Space addressing. One of the these address
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pointers can also be used as an address pointer for look up tables in
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Flash program memory. These added function registers are the 16-bit
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@samp{X}, @samp{Y} and @samp{Z} - registers.
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@smallexample
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X = @r{r26:r27}
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Y = @r{r28:r29}
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Z = @r{r30:r31}
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@end smallexample
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@node AVR-Modifiers
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@subsection Relocatable Expression Modifiers
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@cindex AVR modifiers
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@cindex syntax, AVR
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The assembler supports several modifiers when using relocatable addresses
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in AVR instruction operands. The general syntax is the following:
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@smallexample
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modifier(relocatable-expression)
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@end smallexample
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@table @code
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@cindex symbol modifiers
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@item lo8
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This modifier allows you to use bits 0 through 7 of
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an address expression as an 8 bit relocatable expression.
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@item hi8
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This modifier allows you to use bits 7 through 15 of an address expression
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as an 8 bit relocatable expression. This is useful with, for example, the
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AVR @samp{ldi} instruction and @samp{lo8} modifier.
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For example
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@smallexample
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ldi r26, lo8(sym+10)
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ldi r27, hi8(sym+10)
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@end smallexample
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@item hh8
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This modifier allows you to use bits 16 through 23 of
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an address expression as an 8 bit relocatable expression.
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Also, can be useful for loading 32 bit constants.
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@item hlo8
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Synonym of @samp{hh8}.
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@item hhi8
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This modifier allows you to use bits 24 through 31 of
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an expression as an 8 bit expression. This is useful with, for example, the
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AVR @samp{ldi} instruction and @samp{lo8}, @samp{hi8}, @samp{hlo8},
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@samp{hhi8}, modifier.
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For example
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@smallexample
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ldi r26, lo8(285774925)
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ldi r27, hi8(285774925)
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ldi r28, hlo8(285774925)
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ldi r29, hhi8(285774925)
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; r29,r28,r27,r26 = 285774925
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@end smallexample
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@item pm_lo8
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This modifier allows you to use bits 0 through 7 of
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an address expression as an 8 bit relocatable expression.
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This modifier is useful for addressing data or code from
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Flash/Program memory by two-byte words. The use of @samp{pm_lo8}
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is similar to @samp{lo8}.
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@item pm_hi8
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This modifier allows you to use bits 8 through 15 of
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an address expression as an 8 bit relocatable expression.
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This modifier is useful for addressing data or code from
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Flash/Program memory by two-byte words.
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For example, when setting the AVR @samp{Z} register with the @samp{ldi}
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instruction for subsequent use by the @samp{ijmp} instruction:
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@smallexample
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ldi r30, pm_lo8(sym)
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ldi r31, pm_hi8(sym)
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ijmp
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@end smallexample
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@item pm_hh8
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This modifier allows you to use bits 15 through 23 of
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an address expression as an 8 bit relocatable expression.
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This modifier is useful for addressing data or code from
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Flash/Program memory by two-byte words.
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@end table
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@node AVR Opcodes
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@section Opcodes
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@cindex AVR opcode summary
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@cindex opcode summary, AVR
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@cindex mnemonics, AVR
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@cindex instruction summary, AVR
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For detailed information on the AVR machine instruction set, see
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@url{www.atmel.com/products/AVR}.
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@code{@value{AS}} implements all the standard AVR opcodes.
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The following table summarizes the AVR opcodes, and their arguments.
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@smallexample
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@i{Legend:}
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r @r{any register}
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d @r{`ldi' register (r16-r31)}
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v @r{`movw' even register (r0, r2, ..., r28, r30)}
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a @r{`fmul' register (r16-r23)}
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w @r{`adiw' register (r24,r26,r28,r30)}
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e @r{pointer registers (X,Y,Z)}
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b @r{base pointer register and displacement ([YZ]+disp)}
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z @r{Z pointer register (for [e]lpm Rd,Z[+])}
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M @r{immediate value from 0 to 255}
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n @r{immediate value from 0 to 255 ( n = ~M ). Relocation impossible}
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s @r{immediate value from 0 to 7}
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P @r{Port address value from 0 to 63. (in, out)}
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p @r{Port address value from 0 to 31. (cbi, sbi, sbic, sbis)}
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K @r{immediate value from 0 to 63 (used in `adiw', `sbiw')}
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i @r{immediate value}
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l @r{signed pc relative offset from -64 to 63}
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L @r{signed pc relative offset from -2048 to 2047}
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h @r{absolute code address (call, jmp)}
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S @r{immediate value from 0 to 7 (S = s << 4)}
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? @r{use this opcode entry if no parameters, else use next opcode entry}
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1001010010001000 clc
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1001010011011000 clh
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1001010011111000 cli
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1001010010101000 cln
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1001010011001000 cls
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1001010011101000 clt
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1001010010111000 clv
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1001010010011000 clz
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1001010000001000 sec
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1001010001011000 seh
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1001010001111000 sei
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1001010000101000 sen
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1001010001001000 ses
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1001010001101000 set
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1001010000111000 sev
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1001010000011000 sez
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100101001SSS1000 bclr S
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100101000SSS1000 bset S
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1001010100001001 icall
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1001010000001001 ijmp
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1001010111001000 lpm ?
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1001000ddddd010+ lpm r,z
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1001010111011000 elpm ?
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1001000ddddd011+ elpm r,z
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0000000000000000 nop
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1001010100001000 ret
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1001010100011000 reti
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1001010110001000 sleep
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1001010110011000 break
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1001010110101000 wdr
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1001010111101000 spm
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000111rdddddrrrr adc r,r
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000011rdddddrrrr add r,r
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001000rdddddrrrr and r,r
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000101rdddddrrrr cp r,r
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000001rdddddrrrr cpc r,r
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000100rdddddrrrr cpse r,r
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001001rdddddrrrr eor r,r
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001011rdddddrrrr mov r,r
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100111rdddddrrrr mul r,r
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001010rdddddrrrr or r,r
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000010rdddddrrrr sbc r,r
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000110rdddddrrrr sub r,r
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001001rdddddrrrr clr r
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000011rdddddrrrr lsl r
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000111rdddddrrrr rol r
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001000rdddddrrrr tst r
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0111KKKKddddKKKK andi d,M
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0111KKKKddddKKKK cbr d,n
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1110KKKKddddKKKK ldi d,M
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11101111dddd1111 ser d
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0110KKKKddddKKKK ori d,M
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0110KKKKddddKKKK sbr d,M
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0011KKKKddddKKKK cpi d,M
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0100KKKKddddKKKK sbci d,M
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0101KKKKddddKKKK subi d,M
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1111110rrrrr0sss sbrc r,s
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1111111rrrrr0sss sbrs r,s
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1111100ddddd0sss bld r,s
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1111101ddddd0sss bst r,s
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10110PPdddddPPPP in r,P
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10111PPrrrrrPPPP out P,r
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10010110KKddKKKK adiw w,K
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10010111KKddKKKK sbiw w,K
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10011000pppppsss cbi p,s
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10011010pppppsss sbi p,s
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10011001pppppsss sbic p,s
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10011011pppppsss sbis p,s
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111101lllllll000 brcc l
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111100lllllll000 brcs l
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111100lllllll001 breq l
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111101lllllll100 brge l
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111101lllllll101 brhc l
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111100lllllll101 brhs l
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111101lllllll111 brid l
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111100lllllll111 brie l
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111100lllllll000 brlo l
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111100lllllll100 brlt l
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111100lllllll010 brmi l
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111101lllllll001 brne l
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111101lllllll010 brpl l
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111101lllllll000 brsh l
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111101lllllll110 brtc l
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111100lllllll110 brts l
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111101lllllll011 brvc l
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111100lllllll011 brvs l
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111101lllllllsss brbc s,l
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111100lllllllsss brbs s,l
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|
1101LLLLLLLLLLLL rcall L
|
|
1100LLLLLLLLLLLL rjmp L
|
|
1001010hhhhh111h call h
|
|
1001010hhhhh110h jmp h
|
|
1001010rrrrr0101 asr r
|
|
1001010rrrrr0000 com r
|
|
1001010rrrrr1010 dec r
|
|
1001010rrrrr0011 inc r
|
|
1001010rrrrr0110 lsr r
|
|
1001010rrrrr0001 neg r
|
|
1001000rrrrr1111 pop r
|
|
1001001rrrrr1111 push r
|
|
1001010rrrrr0111 ror r
|
|
1001010rrrrr0010 swap r
|
|
00000001ddddrrrr movw v,v
|
|
00000010ddddrrrr muls d,d
|
|
000000110ddd0rrr mulsu a,a
|
|
000000110ddd1rrr fmul a,a
|
|
000000111ddd0rrr fmuls a,a
|
|
000000111ddd1rrr fmulsu a,a
|
|
1001001ddddd0000 sts i,r
|
|
1001000ddddd0000 lds r,i
|
|
10o0oo0dddddbooo ldd r,b
|
|
100!000dddddee-+ ld r,e
|
|
10o0oo1rrrrrbooo std b,r
|
|
100!001rrrrree-+ st e,r
|
|
1001010100011001 eicall
|
|
1001010000011001 eijmp
|
|
@end smallexample
|
|
|
|
@node AVR Pseudo Instructions
|
|
@section Pseudo Instructions
|
|
|
|
The only available pseudo-instruction @code{__gcc_isr} can be activated by
|
|
option @option{-mgcc-isr}.
|
|
|
|
@table @code
|
|
|
|
@item __gcc_isr 1
|
|
Emit code chunk to be used in avr-gcc ISR prologue.
|
|
It will expand to at most six 1-word instructions, all optional:
|
|
push of @code{tmp_reg}, push of @code{SREG},
|
|
push and clear of @code{zero_reg}, push of @var{Reg}.
|
|
|
|
@item __gcc_isr 2
|
|
Emit code chunk to be used in an avr-gcc ISR epilogue.
|
|
It will expand to at most five 1-word instructions, all optional:
|
|
pop of @var{Reg}, pop of @code{zero_reg},
|
|
pop of @code{SREG}, pop of @code{tmp_reg}.
|
|
|
|
@item __gcc_isr 0, @var{Reg}
|
|
Finish avr-gcc ISR function. Scan code since the last prologue
|
|
for usage of: @code{SREG}, @code{tmp_reg}, @code{zero_reg}.
|
|
Prologue chunk and epilogue chunks will be replaced by appropriate code
|
|
to save / restore @code{SREG}, @code{tmp_reg}, @code{zero_reg} and @var{Reg}.
|
|
|
|
@end table
|
|
|
|
Example input:
|
|
|
|
@example
|
|
__vector1:
|
|
__gcc_isr 1
|
|
lds r24, var
|
|
inc r24
|
|
sts var, r24
|
|
__gcc_isr 2
|
|
reti
|
|
__gcc_isr 0, r24
|
|
@end example
|
|
|
|
Example output:
|
|
|
|
@example
|
|
00000000 <__vector1>:
|
|
0: 8f 93 push r24
|
|
2: 8f b7 in r24, 0x3f
|
|
4: 8f 93 push r24
|
|
6: 80 91 60 00 lds r24, 0x0060 ; 0x800060 <var>
|
|
a: 83 95 inc r24
|
|
c: 80 93 60 00 sts 0x0060, r24 ; 0x800060 <var>
|
|
10: 8f 91 pop r24
|
|
12: 8f bf out 0x3f, r24
|
|
14: 8f 91 pop r24
|
|
16: 18 95 reti
|
|
@end example
|