Commit aeedd582 authored by Tom Musta's avatar Tom Musta Committed by Alexander Graf
Browse files

target-ppc: Introduce tcheck 



Add a degenerate implementation of the Transaction Check (tcheck)
instruction.  Since transaction always immediately fail, this
implementation simply sets CR[BF] to 0b1000, i.e. TDOOMED = 1
and MSR[TS] == 0.

Signed-off-by: default avatarTom Musta <tommusta@gmail.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 56a84615

target-ppc/translate.c

+17 −0
Original line number Diff line number Diff line
@@ -9707,6 +9707,21 @@ GEN_TM_NOOP(tabortdc); 
GEN_TM_NOOP(tabortdci);

GEN_TM_NOOP(tsr);



static void gen_tcheck(DisasContext *ctx)

{

    if (unlikely(!ctx->tm_enabled)) {

        gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_TM);

        return;

    }

    /* Because tbegin always fails, the tcheck implementation

     * is simple:

     *

     * CR[CRF] = TDOOMED || MSR[TS] || 0b0

     *         = 0b1 || 0b00 || 0b0

     */

    tcg_gen_movi_i32(cpu_crf[crfD(ctx->opcode)], 0x8);

}



static opcode_t opcodes[] = {

GEN_HANDLER(invalid, 0x00, 0x00, 0x00, 0xFFFFFFFF, PPC_NONE),

GEN_HANDLER(cmp, 0x1F, 0x00, 0x00, 0x00400000, PPC_INTEGER),
@@ -11136,6 +11151,8 @@ GEN_HANDLER2_E(tabortdci, "tabortdci", 0x1F, 0x0E, 0x1B, 0x00000000, \ 
               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tsr, "tsr", 0x1F, 0x0E, 0x17, 0x03DFF800, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tcheck, "tcheck", 0x1F, 0x0E, 0x16, 0x007FF800, \

               PPC_NONE, PPC2_TM),

};



#include "helper_regs.h"