9.39.1 RX Options
The Renesas RX port of as has a few target specific
command-line options:
-m32bit-doubles- This option controls the ABI and indicates to use a 32-bit float ABI.
It has no effect on the assembled instructions, but it does influence
the behaviour of the ‘.double’ pseudo-op.
This is the default.
-m64bit-doubles- This option controls the ABI and indicates to use a 64-bit float ABI.
It has no effect on the assembled instructions, but it does influence
the behaviour of the ‘.double’ pseudo-op.
-mbig-endian- This option controls the ABI and indicates to use a big-endian data
ABI. It has no effect on the assembled instructions, but it does
influence the behaviour of the ‘.short’, ‘.hword’, ‘.int’,
‘.word’, ‘.long’, ‘.quad’ and ‘.octa’ pseudo-ops.
-mlittle-endian- This option controls the ABI and indicates to use a little-endian data
ABI. It has no effect on the assembled instructions, but it does
influence the behaviour of the ‘.short’, ‘.hword’, ‘.int’,
‘.word’, ‘.long’, ‘.quad’ and ‘.octa’ pseudo-ops.
This is the default.
-muse-conventional-section-names- This option controls the default names given to the code (.text),
initialised data (.data) and uninitialised data sections (.bss).
-muse-renesas-section-names- This option controls the default names given to the code (.P),
initialised data (.D_1) and uninitialised data sections (.B_1).
This is the default.
-msmall-data-limit- This option tells the assembler that the small data limit feature of
the RX port of GCC is being used. This results in the assembler
generating an undefined reference to a symbol called
__gp for
use by the relocations that are needed to support the small data limit
feature. This option is not enabled by default as it would otherwise
pollute the symbol table.
-mpid- This option tells the assembler that the position independent data of the
RX port of GCC is being used. This results in the assembler
generating an undefined reference to a symbol called
__pid_base,
and also setting the RX_PID flag bit in the e_flags field of the ELF
header of the object file.
-mint-register=num- This option tells the assembler how many registers have been reserved
for use by interrupt handlers. This is needed in order to compute the
correct values for the
%gpreg and %pidreg meta registers.
-mgcc-abi- This option tells the assembler that the old GCC ABI is being used by
the assembled code. With this version of the ABI function arguments
that are passed on the stack are aligned to a 32-bit boundary.
-mrx-abi- This option tells the assembler that the official RX ABI is being used
by the assembled code. With this version of the ABI function
arguments that are passed on the stack are aligned to their natural
alignments. This option is the default.
-mcpu=name- This option tells the assembler the target CPU type. Currently the
rx100, rx200, rx600, rx610, rxv2,
rxv3 and rxv3-dfpu are recognised as valid cpu names.
Attempting to assemble an instructionnot supported by the indicated
cpu type will result in an error message being generated.
-mno-allow-string-insns- This option tells the assembler to mark the object file that it is
building as one that does not use the string instructions
SMOVF, SCMPU, SMOVB, SMOVU, SUNTIL
SWHILE or the RMPA instruction. In addition the mark
tells the linker to complain if an attempt is made to link the binary
with another one that does use any of these instructions.
Note - the inverse of this option, -mallow-string-insns, is
not needed. The assembler automatically detects the use of the
the instructions in the source code and labels the resulting
object file appropriately. If no string instructions are detected
then the object file is labelled as being one that can be linked with
either string-using or string-banned object files.