AMD29K
options
The following -m
options are defined for the AMD Am29000.
- -mdw
- -mndw
- -mbw
- -mnbw
- -msmall
- -mnormal
- -mlarge
- -m29050
- -m29000
- -mkernel-registers
- Generate code that assumes
the DW
bit is set, i.e., that byte and halfword operations are directly supported
by the hardware. This is the default.
- Generate code that assumes
the DW
bit is not set.
- Generate code that assumes
the system supports byte and halfword write operations. This is the default.
- Generate code that assumes
the systems does not support byte and halfword write operations. -mnbw
implies -mndw.
- Use a small memory model
that assumes that all function addresses are either within a single 256
KB segment or at an absolute address of less than 256k. This allows the
call
instruction to be used instead of a const,
consth,
calli sequence.
- Use the normal memory model:
Generate call
instructions only when calling functions in the same file and calli
instructions otherwise. This works if each file occupies less than 256
KB but allows the entire executable to be larger than 256 KB. This is the
default.
- Always use calli
instructions. Specify this option if you expect a single file to compile
into more than 256 KB of code.
- Generate code for the Am29050.
- Generate code for the Am29000.
This is the default.
- Generate references to registers
gr64-gr95
instead of to registers gr96-gr127.
This option can be used when compiling kernel code that wants a set of
global registers disjoint from that used by user-mode code.
- Note:
When this option is used, register names in -f flags must use the normal, user-mode, names.
- -muser-registers
- -mstack-check
- -mno-stack-check
- -mstorem-bug
- -mno-storem-bug
- -mno-reuse-arg-regs
- -mreuse-arg-regs
- -mno-impure-text
- -mimpure-text
- -msoft-float
- Warning:
- Use the normal set of global
registers, gr96-gr127.
This is the default.
- Insert (or do not insert)
a call to __msp_check
after each stack adjustment. This is often used for kernel code.
- -mstorem-bug
handles 29k processors which cannot handle the separation of a mtsrim
insn and a storem
instruction (most 29000 chips to date, but not the 29050).
- -mno-reuse-arg-regs tells
the compiler to only use incoming argument registers for copying out arguments.
This helps detect calling a function with fewer arguments than those with
which it was declared.
- -mimpure-text,
used in addition to -shared,
tells the compiler to not pass -assert
pure-text to the
linker when linking a shared object.
- Generate output containing
library calls for floating point.
The requisite libraries are not part of GNU CC. Normally the facilities of the machines usual C compiler are used, but this cant be done directly in cross-compilation. You must make your own arrangements to provide suitable library functions for cross-compilation.
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