2015-08-04 Thomas Preud'homme <thomas.preudhomme@arm.com>

[binutils-gdb.git] / gas / doc / c-msp430.texi

diff --git a/gas/doc/c-msp430.texi b/gas/doc/c-msp430.texi
index 4beb90a0bf1ff39f073ee32ab306fa8c88211fc0..2a372dbecef97fd93147365a9a17e959a149dab5 100644 (file)
--- a/gas/doc/c-msp430.texi
+++ b/gas/doc/c-msp430.texi
@@ -1,4 +1,4 @@
-@c Copyright 2002, 2004, 2005, 2011 Free Software Foundation, Inc.
+@c Copyright (C) 2002-2015 Free Software Foundation, Inc.
 @c This is part of the GAS manual.
 @c For copying conditions, see the file as.texinfo.
 @ifset GENERIC
@@ -28,14 +28,55 @@
 @cindex options for MSP430 (none)
 @table @code
 
-@item -m
-select the mpu arch. Currently has no effect.
+@item -mmcu
+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.
+
 @item -mP
 enables polymorph instructions handler.
 
 @item -mQ
 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.  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
+RAM at execution startup.  Disabled by default.
+
 @end table
 
 @node MSP430 Syntax
@@ -215,15 +256,29 @@ used for the directive called @code{.app-file} in the MSP 430 support.
 This directive is ignored; it is accepted for compatibility with other
 MSP 430 assemblers.
 
-@cindex @code{sect} directive, MSP 430
+@cindex @code{arch} directive, MSP 430
 @item .arch
-Currently this directive is ignored; it is accepted for compatibility with other
-MSP 430 assemblers.
+Sets the target microcontroller in the same way as the @option{-mmcu}
+command line option.
+
+@cindex @code{cpu} directive, MSP 430
+@item .cpu
+Sets the target architecture in the same way as the @option{-mcpu}
+command line option.
 
 @cindex @code{profiler} directive, MSP 430
 @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