diff options
Diffstat (limited to 'binutils-2.25/gas/doc/c-msp430.texi')
| -rw-r--r-- | binutils-2.25/gas/doc/c-msp430.texi | 51 |
1 files changed, 38 insertions, 13 deletions
diff --git a/binutils-2.25/gas/doc/c-msp430.texi b/binutils-2.25/gas/doc/c-msp430.texi index 2927add4..cae3d8a6 100644 --- a/binutils-2.25/gas/doc/c-msp430.texi +++ b/binutils-2.25/gas/doc/c-msp430.texi @@ -1,4 +1,4 @@ -@c Copyright 2002-2013 Free Software Foundation, Inc. +@c Copyright (C) 2002-2014 Free Software Foundation, Inc. @c This is part of the GAS manual. @c For copying conditions, see the file as.texinfo. @ifset GENERIC @@ -29,13 +29,12 @@ @table @code @item -mmcu -selects the mpu arch. If the architecture is 430Xv2 then this also -enables NOP generation unless the @option{-mN} is also specified. +selects the mcu architecture. If the architecture is 430Xv2 then this +also enables NOP generation unless the @option{-mN} is also specified. @item -mcpu selects the cpu architecture. If the architecture is 430Xv2 then this -also enables NOP generation unless the @option{-mN} is also -specified. +also enables NOP generation unless the @option{-mN} is also specified. @item -mP enables polymorph instructions handler. @@ -46,16 +45,33 @@ enables relaxation at assembly time. DANGEROUS! @item -ml indicates that the input uses the large code model. +@item -mn +enables the generation of a NOP instruction following any instruction +that might change the interrupts enabled/disabled state. The +pipelined nature of the MSP430 core means that any instruction that +changes the interrupt state (@code{EINT}, @code{DINT}, @code{BIC #8, +SR}, @code{BIS #8, SR} or @code{MOV.W <>, SR}) must be +followed by a NOP instruction in order to ensure the correct +processing of interrupts. By default it is up to the programmer to +supply these NOP instructions, but this command line option enables +the automatic insertion by the assembler, if they are missing. + @item -mN disables the generation of a NOP instruction following any instruction -that might change the interrupts enabled/disabled state. For the -430Xv2 architecture the instructions: @code{EINT}, @code{DINT}, -@code{BIC #8, SR}, @code{BIS #8, SR} and @code{MOV.W <>, SR} must be -followed by a NOP instruction in order to ensure the correct -processing of interrupts. By default generation of the NOP -instruction happens automatically, but this command line option -disables this behaviour. It is then up to the programmer to ensure -that interrupts are enabled and disabled correctly. +that might change the interrupts enabled/disabled state. This is the +default behaviour. + +@item -my +tells the assembler to generate a warning message if a NOP does not +immediately forllow an instruction that enables or disables +interrupts. This is the default. + +Note that this option can be stacked with the @option{-mn} option so +that the assembler will both warn about missing NOP instructions and +then insert them automatically. + +@item -mY +disables warnings about missing NOP instructions. @item -md mark the object file as one that requires data to copied from ROM to @@ -254,6 +270,15 @@ command line option. @item .profiler This directive instructs assembler to add new profile entry to the object file. +@cindex @code{refsym} directive, MSP 430 +@item .refsym +This directive instructs assembler to add an undefined reference to +the symbol following the directive. The maximum symbol name length is +1023 characters. No relocation is created for this symbol; it will +exist purely for pulling in object files from archives. Note that +this reloc is not sufficient to prevent garbage collection; use a +KEEP() directive in the linker file to preserve such objects. + @end table @node MSP430 Opcodes |