diff options
| author | Dimitar Dimitrov <dimitar@dinux.eu> | 2020-11-12 22:23:26 +0200 |
|---|---|---|
| committer | Dimitar Dimitrov <dimitar@dinux.eu> | 2020-11-12 22:41:10 +0200 |
| commit | e57cf1f2cdf819946494becf282e47194aa6216d (patch) | |
| tree | b30063156b4d1d911a625aaf4b53c8155ab25dbf /sim/pru | |
| parent | 1350c3b47a6fed106d1f6814376dd12dea8a14d0 (diff) | |
| download | gdb-e57cf1f2cdf819946494becf282e47194aa6216d.zip gdb-e57cf1f2cdf819946494becf282e47194aa6216d.tar.gz gdb-e57cf1f2cdf819946494becf282e47194aa6216d.tar.bz2 | |
sim: pru: Add support for LMBD instruction
Binutils support for LMBD instruction was merged [1]. So add it also
to simulator.
LMBD instruction does left-most-bit-detection. It returns 32 if
the given bit value is not found in the provided word value.
[1] https://sourceware.org/pipermail/binutils/2020-October/113901.html
sim/pru/ChangeLog:
* pru.h (RS1SEL): New macro.
(RS1_WIDTH): New macro.
* pru.isa: Describe the LMBD instruction.
sim/testsuite/sim/pru/ChangeLog:
* lmbd.s: New test.
Diffstat (limited to 'sim/pru')
| -rw-r--r-- | sim/pru/ChangeLog | 6 | ||||
| -rw-r--r-- | sim/pru/pru.h | 2 | ||||
| -rw-r--r-- | sim/pru/pru.isa | 15 |
3 files changed, 23 insertions, 0 deletions
diff --git a/sim/pru/ChangeLog b/sim/pru/ChangeLog index bccc3ef..ad9aff9 100644 --- a/sim/pru/ChangeLog +++ b/sim/pru/ChangeLog @@ -1,3 +1,9 @@ +2020-11-12 Dimitar Dimitrov <dimitar@dinux.eu> + + * pru.h (RS1SEL): New macro. + (RS1_WIDTH): New macro. + * pru.isa: Describe the LMBD instruction. + 2019-09-23 Dimitar Dimitrov <dimitar@dinux.eu> * Makefile.in: New file. diff --git a/sim/pru/pru.h b/sim/pru/pru.h index 240fc30..cbcc3ef 100644 --- a/sim/pru/pru.h +++ b/sim/pru/pru.h @@ -58,6 +58,8 @@ #define XBBO_BASEREG (CPU.regs[GET_INSN_FIELD (RS1, inst)]) +#define RS1SEL GET_INSN_FIELD (RS1SEL, inst) +#define RS1_WIDTH regsel_width (RS1SEL) #define RDSEL GET_INSN_FIELD (RDSEL, inst) #define RD_WIDTH regsel_width (RDSEL) #define RD_REGN GET_INSN_FIELD (RD, inst) diff --git a/sim/pru/pru.isa b/sim/pru/pru.isa index 0501545..c7860d0 100644 --- a/sim/pru/pru.isa +++ b/sim/pru/pru.isa @@ -247,3 +247,18 @@ INSTRUCTION (iloop, LOOP_IN_PROGRESS = 1; PC++; }) + +INSTRUCTION (lmbd, + { + int lmbd_i; + + OP2 = (IO ? IMM8 : RS2); + + for (lmbd_i = RS1_WIDTH - 1; lmbd_i >= 0; lmbd_i--) + { + if (!(((RS1 >> lmbd_i) ^ OP2) & 1)) + break; + } + RD = (lmbd_i < 0) ? 32 : lmbd_i; + PC++; + }) |