6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-07-08 15:29:09 +00:00
Code Issues Projects Releases Wiki Activity

Rounds out field list.

Browse Source
This commit is contained in:
Thomas Harte 2021-01-01 16:38:40 -05:00
parent 0ef42f93ff
commit 8151c8e409
1 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Processors/Decoders/PowerPC/PowerPC.hpp
View File

@ -89,12 +89,17 @@ struct Instruction {
// in order to capture that information here rather than thrusting it upon
// the reader of whatever implementation may follow.
// TODO: d, ds, FM, MB, ME, NB, OPCD, SH, SR, XO
// Currently omitted: OPCD and XO, which I think are unnecessary given that
// full decoding has already occurred.
/// Immediate field used to specify an unsigned 16-bit integer.
uint16_t uimm() { return uint16_t(opcode & 0xffff); }
/// Immediate field used to specify a signed 16-bit integer.
int16_t simm() { return int16_t(opcode & 0xffff); }
/// Immediate field used to specify a signed 16-bit integer.
int16_t d() { return int16_t(opcode & 0xffff); }
/// Immediate field used to specify a signed 14-bit integer [64-bit only].
int16_t ds() { return int16_t(opcode & 0xfffc); }
/// Immediate field used as data to be placed into a field in the floating point status and condition register.
int32_t imm() { return (opcode >> 12) & 0xf; }
@ -128,6 +133,11 @@ struct Instruction {
/// Branch displacement; provided as already sign extended.
int16_t bd() { return int16_t(opcode & 0xfffc); }
/// Specifies the first 1 bit of a 32/64-bit mask for rotate operations.
uint32_t mb() { return (opcode >> 6) & 0x1f; }
/// Specifies the first 1 bit of a 32/64-bit mask for rotate operations.
uint32_t me() { return (opcode >> 1) & 0x1f; }
/// Condition register source bit A.
uint32_t crbA() { return (opcode >> 16) & 0x1f; }
/// Condition register source bit B.
@ -146,6 +156,16 @@ struct Instruction {
/// Mask identifying fields to be updated by mtfsf.
uint32_t fm() { return (opcode >> 17) & 0xff; }
/// Specifies the number of bytes to move in an immediate string load or store.
uint32_t nb() { return (opcode >> 11) & 0x1f; }
/// Specifies a shift amount.
/// TODO: possibly bit 30 is also used in 64-bit mode, find out.
uint32_t sh() { return (opcode >> 11) & 0x1f; }
/// Specifies one of the 16 segment registers [32-bit only].
uint32_t sr() { return (opcode >> 16) & 0xf; }
/// A 24-bit signed number; provided as already sign extended.
int32_t li() {
constexpr uint32_t extensions[2] = {