diff options
| author | Thiemo Seufer <ths@networkno.de> | 2006-04-26 22:19:15 +0400 |
|---|---|---|
| committer | Thiemo Seufer <ths@networkno.de> | 2006-04-26 22:19:15 +0400 |
| commit | 564d770d9a8951bb488f63f355812dbeef41f1e6 (patch) | |
| tree | 21f637441548fe2dfdbd02912c69e1321fbbf565 /include | |
| parent | 330a2faed95927d539db8bae15748eb1e0e12a02 (diff) | |
* mips.h: Improve comments describing the bitfield instruction
fields.
Diffstat (limited to 'include')
| -rw-r--r-- | include/opcode/ChangeLog | 7 | ||||
| -rw-r--r-- | include/opcode/mips.h | 11 |
2 files changed, 12 insertions, 6 deletions
diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog index ad4411a2c..425abdbcf 100644 --- a/include/opcode/ChangeLog +++ b/include/opcode/ChangeLog @@ -1,4 +1,9 @@ -2006-04-07 Joerg Wunsch <j.gnu@uriah.heep.sax.de> +2006-04-26 Thiemo Seufer <ths@networkno.de> + + * mips.h: Improve comments describing the bitfield instruction + fields. + +2006-04-07 Joerg Wunsch <j.gnu@uriah.heep.sax.de> * avr.h (AVR_ISA_PWMx): New. diff --git a/include/opcode/mips.h b/include/opcode/mips.h index 4bec5edcc..ae3f43748 100644 --- a/include/opcode/mips.h +++ b/include/opcode/mips.h @@ -268,19 +268,20 @@ struct mips_opcode "x" accept and ignore register name "z" must be zero register "K" 5 bit Hardware Register (rdhwr instruction) (OP_*_RD) - "+A" 5 bit ins/ext position, which becomes LSB (OP_*_SHAMT). + "+A" 5 bit ins/ext/dins/dext/dinsm/dextm position, which becomes + LSB (OP_*_SHAMT). Enforces: 0 <= pos < 32. - "+B" 5 bit ins size, which becomes MSB (OP_*_INSMSB). + "+B" 5 bit ins/dins size, which becomes MSB (OP_*_INSMSB). Requires that "+A" or "+E" occur first to set position. Enforces: 0 < (pos+size) <= 32. - "+C" 5 bit ext size, which becomes MSBD (OP_*_EXTMSBD). + "+C" 5 bit ext/dext size, which becomes MSBD (OP_*_EXTMSBD). Requires that "+A" or "+E" occur first to set position. Enforces: 0 < (pos+size) <= 32. (Also used by "dext" w/ different limits, but limits for that are checked by the M_DEXT macro.) - "+E" 5 bit dins/dext position, which becomes LSB-32 (OP_*_SHAMT). + "+E" 5 bit dinsu/dextu position, which becomes LSB-32 (OP_*_SHAMT). Enforces: 32 <= pos < 64. - "+F" 5 bit "dinsm" size, which becomes MSB-32 (OP_*_INSMSB). + "+F" 5 bit "dinsm/dinsu" size, which becomes MSB-32 (OP_*_INSMSB). Requires that "+A" or "+E" occur first to set position. Enforces: 32 < (pos+size) <= 64. "+G" 5 bit "dextm" size, which becomes MSBD-32 (OP_*_EXTMSBD). |