SVC 12 (0A0C)

SYNCH or SYNCHX macro - is type 2, gets LOCAL and CMS locks.

Calls module CSVSYNCH, entry point IGC012.

GTF data is:

R15

Address of the entry point for the processing program that is to be given control.

R14

Points to a parameter list if the low order bit of register 15 is set. The parameter list is in the following format:

Bytes

Contents

0

Flag bits as follows:


1...	....	Restore R2 - R12 at exit.
.000	00..	Reserved (must be zero).
....	..00	Routine to receive control in 24-bit mode.
....	..01	Addressing mode of called routine is defined via R15; if the high order bit of R15 is set, the routine receives control in 31-bit mode: otherwise, 24 bit mode.
....	..10	Routine to receive control in 31-bit mode.
....	..11	Routine to receive control in the addressing mode of the caller.

1

Flag bits as follows:


1...	....	Key of called routine supplied via KEYADDR option.
.1..	....	Called routine to receive control in supervisor state.
..00	0000	Reserved (must be zero).

2

The high order 4 bits contain the key which is supplied via the KEYADDR option. The low order 4 bits must be zero.

3

Macro level - if byte 3 = 1, the parameter list includes 4 bytes for the KEYMASK field.

4

Address of a halfword containing the keymask value supplied via the KEYMASK option.