![]() ![]() MARS maintains file descriptors internally and allocates them starting with 3. Implementation uses java.io.FileInputStream.read() to read and java.io.FileOutputStream.write() to write. The returned file descriptor will be negative if the operation failed. Service 13 - MARS implements three flag values: 0 for read-only, 1 for write-only with create, and 9 for write-only with create and append. Service 11 - Prints ASCII character corresponding to contents of low-order byte. If n < 1, input is ignored and nothing is written to the buffer. In either case, then pads with null byte If n = 1, input is ignored and null byte placed at buffer address. For specified length n, string can be no longer than n-1. Service 8 - Follows semantics of UNIX 'fgets'. NOTES: Services numbered 30 and higher are not provided by SPIM $a1 = address of null-terminated string to display after the first string $f12 = double value to display in string form after the first string $f12 = float value to display in string form after the first string $a1 = int value to display in string form after the first string $a0 = address of null-terminated string that is an information-type message to user $a1 = the type of message to be displayed:Ġ: error message, indicated by Error iconġ: information message, indicated by Information iconĢ: warning message, indicated by Warning iconģ: question message, indicated by Question icon #TONEGENERATOR POSITIVE SOUND PLUS#Buffer contains the maximum allowable input string plus a terminating null. 4: length of the input string exceeded the specified maximum. 3: OK was chosen but no data had been input into field. 3: OK was chosen but no data had been input into fieldĠ: OK status. 1: input data cannot be correctly parsed ![]() $a0 = address of null-terminated string that is the message to user $f0 contains the next pseudorandom, uniformly distributed double value in the range 0.0 <= f < 1.0 from this random number generator's sequence. $f0 contains the next pseudorandom, uniformly distributed float value in the range 0.0 <= f < 1.0 from this random number generator's sequence. $a0 contains pseudorandom, uniformly distributed int value in the range 0 <= <, drawn from this random number generator's sequence. $a1 = upper bound of range of returned values. $a0 contains the next pseudorandom, uniformly distributed int value from this random number generator's sequence. #TONEGENERATOR POSITIVE SOUND GENERATOR#Sets the seed of the corresponding underlying Java pseudorandom number generator ( ). $a1 = seed for corresponding pseudorandom number generator. of pseudorandom number generator (any int). See note below tableĭisplayed value is 8 hexadecimal digits, left-padding with zeroes if necessary.ĭisplayed value is 32 bits, left-padding with zeroes if necessary. Generate tone and return upon tone completion. This timing will not be precise, as the Java implementation will add some overhead. $a0 = the length of time to sleep in milliseconds.Ĭauses the MARS Java thread to sleep for (at least) the specified number of milliseconds. Services 30 and higher are exclusive to MARS. ![]() Services 1 through 17 are compatible with the SPIM simulator, other than Open File (13) as described in the Notes below the table. $v0 contains number of characters written (negative if error). $v0 contains number of characters read (0 if end-of-file, negative if error). $a2 = maximum number of characters to read $v0 contains file descriptor (negative if error). $a0 = address of null-terminated string containing filename $a1 = maximum number of characters to read $a0 = address of null-terminated string to print ![]() Retrieve return values, if any, from result registers as specified.Įxample: display the value stored in $t0 on the consoleĪdd $a0, $t0, $zero # load desired value into argument register $a0, using pseudo-op Load argument values, if any, in $a0, $a1, $a2, or $f12 as specified. MIPS register contents are not affected by a system call, except for result registersĪs specified in the table below. Intro Settings Syscalls IDE Debugging Command Tools History Limitations Exception Handlers Macros Acknowledgements MARS home SYSCALL functions available in MARS IntroductionĪ number of system services, mainly for input and output, are available for use by ![]()
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