Compiler/MSP430F5335: Need to place assembly code at specific memory location

Silver Diamond said:

In C++ there is

#pragma LOCATION(hex_address)

that does not require any linker directive changes. Is there a way to do something similar to assembly routine?

a) The function was placed in a section named ".TI.bound:<C++_mangled_function_name>".

b) The compiler generated a .bound assembler directive to tell the linker to place the function at the address specified by the #pragma LOCATION.

E.g. the following in the C++ source file:

#pragma LOCATION (0x95e4);
void test (void)
{

}

Showed the following in the assembly listing:

	.bound	".TI.bound:_Z4testv", 38372, 0
;	C:\ti\ccs740\ccsv7\tools\compiler\ti-cgt-msp430_16.9.6.LTS\bin\opt430.exe C:\\Users\\MR_HAL~1\\AppData\\Local\\Temp\\{4DF911C9-C1AE-44EE-A34F-D97BE9EDFC1D} C:\\Users\\MR_HAL~1\\AppData\\Local\\Temp\\{7A9072F9-E7F7-400B-AB7F-871CCFD33940} 
	.sect	".TI.bound:_Z4testv"
	.clink
	.global	_Z4testv

The MSP430 Assembly Language Tools v17.9.0.STS User's Guide states the the .bound directive is used internally by the C/C++ compiler, and that you shouldn't use the .bound directive in your own assembly language source files.

On a quick test using TI v16.9.6.LTS when the following was used in a .asm source file the linker did appear to respect the directive and place the __divu and __remu functions at the requested address of 0x9b54 (based upon inspecting the linker map file and output from the MSP430 Hex Utility):

    .sect ".TI.bound:__divu"
__divu: .asmfunc stack_usage(RETADDRSZ)
__remu:
    .bound  ".TI.bound:__divu", 0x9B54, 0
    CLR.W   R14     ; Initialize the remainder
    MOV.W   R12,R15     ; Copy dividend for shifting
    MOV.W   #1,R12      ; Walk 1 across for looping, also hold quotient
div_loop:
    RLA.W   R15     ; Shift dividend into remainder
    RLC.W   R14
    CMP.W   R13,R14     ; If current remainder > divisor, subtract
    JNC set_quotient_bit
    SUB.W   R13,R14
set_quotient_bit:
    RLC.W   R12     ; Set quotient bit (in carry),adv loop bit
    JNC div_loop
    RET
    .endasmfunc

However, since the MSP430 Assembly Language Tools v17.9.0.STS User's Guide states that .bound is only for internal C/C++ compiler use you shouldn't rely upon its use.