Motorola MVME2700 Series Manuel d'utilisateur télécharger pdf (Page 328)

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One-Line Assembler/ Disassembler

to a byte of memory, with the eighth bit (MSB) always equal to zero. If

only one byte is entered, the byte is right justified. Any number of ASCII

characters may be entered for each WORD directive, and the characters are

right justified, but truncation occurs after four characters.

An ASCII string which contains spaces may not be used as an argument to

the WORD directive, even if the string is enclosed inside single quotes. In

this case, the mm command may be used in place of the assembler’s

WORD directive. Note that to use mm, the one-line assembler must be

exited.

The following example illustrates the Assembler Error which will occur if

the user attempts to enter a string containing spaces using the WORD

directive. Following the error is an example of the use of the mm

command to put the string into memory instead.

PPC1-Bug>as 80000

user enters WORD ’abcd’, which works fine

00080000 61626364 ORI R2,R11,$6364

user enters WORD ’ab d’, which is invalid

00080004 00000000 WORD $00000000? WORD ’ab d’

Assembler Error: Operand Conversion

exit the one-line assembler

00080004 00000000 WORD $00000000? .

use mm command instead

PPC1-Bug>mm 80004

00080004 00000000? ’ab d’

00080008 00000000? .

verify this using md command

PPC1-Bug>md 80000:4

00080000 61626364 61622064 00000000 00000000 abcdab d........

SYSCALL System Call Directive

The function of this directive is to aid you in making the appropriate

system call entry to the debugger system call routines. The format for this

directive is:

SYSCALL <.ROUTINE>

1 2 ... 323 324 325 326 327 328 329 330 331 332 333 ... 507 508

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Motorola MVME2700 Series Manuel d'utilisateur Page 328

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