| # MACRO: start |
| # All assembler tests should start with a call to "start" |
| .macro start |
| .text |
| |
| # Skip over these inlined funcs. |
| jmp __start; |
| |
| .global __pass |
| .type __pass, function |
| __pass: |
| # Note - we cannot just invoke: |
| # |
| # write 1, _passmsg, 5 |
| # |
| # here because _passmsg contains the run-time (VMA) address of |
| # the pass string (probably 0x500) not the load-time (LMA) |
| # address (probably 0x804c). Normally using the VMA address |
| # would be the correct thing to do - *if* there was some start |
| # up code which copied data from LMA to VMA. But we have no |
| # start up code, so the data still resides at the LMA |
| # address. Hence we use __romdatastart instead. |
| # |
| # Note - we are cheating because the address that we pass to |
| # "write" should actually be: |
| # |
| # __romdatastart + (_passmsg - __datastart) |
| # |
| # but the assembler cannot cope with this expression. So we |
| # cheat and use the fact that we know that _passmsg is the |
| # first string in the .data section and so (_passmsg - |
| # __datastart) evaluates to zero. |
| |
| write 1, __romdatastart, 5 |
| exit 0 |
| |
| .global __fail |
| .type __fail, function |
| __fail: |
| # Note - see above. |
| # |
| # write 1, _failmsg, 5 |
| # |
| # This time we use the fact that _passmsg is aligned to a |
| # 16 byte boundary to work out that (_failmsg - __datastart) |
| # evaluates to 0x10. |
| |
| write 1, __romdatastart + 0x10, 5 |
| exit 1 |
| |
| .data |
| _passmsg: |
| .ascii "pass\n" |
| .align 4 |
| |
| _failmsg: |
| .ascii "fail\n" |
| .align 4 |
| |
| .text |
| .global __start |
| .type __start, function |
| __start: |
| .endm |
| |
| # MACRO: system_call |
| # Make a libgloss/Linux system call |
| .macro system_call nr:req |
| call #(0x180|\nr); |
| .endm |
| |
| # MACRO: exit |
| # Quit the current test |
| .macro exit rc:req |
| mov #\rc, r12 |
| system_call 1 |
| .endm |
| |
| # MACRO: pass |
| # Write 'pass' to stdout via syscalls and quit; |
| # meant for non-OS operating environments |
| .macro pass |
| jmp __pass; |
| .endm |
| |
| # MACRO: fail |
| # Write 'fail' to stdout via syscalls and quit; |
| # meant for non-OS operating environments |
| .macro fail |
| jmp __fail; |
| .endm |
| |
| # MACRO: write |
| # Just like the write() C function; uses system calls |
| .macro write fd:req, buf:req, count:req |
| mov #\fd, r12; |
| mov #\buf, r13; |
| mov #\count, r14; |
| system_call 5 |
| .endm |