Interpreter fixes for BREAK and a few other instructions.

This should fix F1 2000. (but it's possible that game
needs some tweaks to the CDROM timings as it's quite sensitive to them)

Co-authored-by: Nicolas Noble <nicolasnoble@users.noreply.github.com>

diff --git a/libpcsxcore/psxinterpreter.c b/libpcsxcore/psxinterpreter.c
index b96b6f0..f9e13bf 100644 (file)
--- a/libpcsxcore/psxinterpreter.c
+++ b/libpcsxcore/psxinterpreter.c
@@ -662,9 +662,9 @@ void psxSRL() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) >> _Sa_; } // Rd =
 * Shift arithmetic with variant register shift           *
 * Format:  OP rd, rt, rs                                 *
 *********************************************************/
-void psxSLLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) << _u32(_rRs_); } // Rd = Rt << rs
-void psxSRAV() { if (!_Rd_) return; _i32(_rRd_) = _i32(_rRt_) >> _u32(_rRs_); } // Rd = Rt >> rs (arithmetic)
-void psxSRLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) >> _u32(_rRs_); } // Rd = Rt >> rs (logical)
+void psxSLLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) << (_u32(_rRs_) & 0x1F); } // Rd = Rt << rs
+void psxSRAV() { if (!_Rd_) return; _i32(_rRd_) = _i32(_rRt_) >> (_u32(_rRs_) & 0x1F); } // Rd = Rt >> rs (arithmetic)
+void psxSRLV() { if (!_Rd_) return; _u32(_rRd_) = _u32(_rRt_) >> (_u32(_rRs_) & 0x1F); } // Rd = Rt >> rs (logical)
 
 /*********************************************************
 * Load higher 16 bits of the first word in GPR with imm  *
@@ -691,7 +691,8 @@ void psxMTLO() { _rLo_ = _rRs_; } // Lo = Rs
 * Format:  OP                                            *
 *********************************************************/
 void psxBREAK() {
-       // Break exception - psx rom doens't handles this
+       psxRegs.pc -= 4;
+       psxException(0x24, branch);
 }
 
 void psxSYSCALL() {
@@ -726,14 +727,14 @@ void psxJAL() {   _SetLink(31); doBranch(_JumpTarget_); }
 * Format:  OP rs, rd                                     *
 *********************************************************/
 void psxJR()   {
-       doBranch(_u32(_rRs_));
+       doBranch(_u32(_rRs_) & ~3);
        psxJumpTest();
 }
 
 void psxJALR() {
        u32 temp = _u32(_rRs_);
        if (_Rd_) { _SetLink(_Rd_); }
-       doBranch(temp);
+       doBranch(temp & ~3);
 }
 
 /*********************************************************