MHELP operand mapping
The MHELP operand field is mapped into a fullword. The predefined MHELP codes correspond to the fourth byte of this fullword, while the &SYSNDX limit is controlled by setting any bit in the third byte to 1. If all bits in the third byte are 0, then the &SYSNDX limit is not set.
The bit settings for bytes 3 and 4 are shown in Table 1.
Byte | Description | |
---|---|---|
Byte 3 - &SYSNDX control |
|
Bit 0 = 1. Value=32768. Limit &SYSNDX to 32768. Bit 1 = 1. Value=16384. Limit &SYSNDX to 16384. Bit 2 = 1. Value=8192. Limit &SYSNDX to 8192. Bit 3 = 1. Value=4096. Limit &SYSNDX to 4096. Bit 4 = 1. Value=2048. Limit &SYSNDX to 2048. Bit 5 = 1. Value=1024. Limit &SYSNDX to 1024. Bit 6 = 1. Value=512. Limit &SYSNDX to 512. Bit 7 = 1. Value=256. Limit &SYSNDX to 256. |
Byte 4 |
|
Bit 0 = 1. Value=128. MHELP Suppression. Bit 1 = 1. Value=64. Macro Hex Dump. Bit 2 = 1. Value=32. Global Suppression. Bit 3 = 1. Value=16. Macro Entry Dump. Bit 4 = 1. Value=8. Macro Exit Dump. Bit 5 = 1. Value=4. Macro AIF Dump. Bit 6 = 1. Value=2. Macro Branch Trace. Bit 7 = 1. Value=1. Macro Call Trace. |
MHELP 256 Limit &SYSNDX to 256
MHELP 1 Trace macro calls
MHELP 65536 No effect. No bits in bytes 3,4
MHELP 65792 Limit &SYSNDX to 65792
See Figure 1 for more examples.