Commit f83c2378 authored by Tom Musta's avatar Tom Musta Committed by Alexander Graf
Browse files

target-ppc: Introduce Privileged TM Noops 



Add the supervisory Transactional Memory instructions treclaim. and
trechkpt.  The implementation is a degenerate one that simply
checks privileged state, TM availability and then sets CR[0] to
0b0000, just like the unprivileged noops.

Signed-off-by: default avatarTom Musta <tommusta@gmail.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent aeedd582

target-ppc/translate.c

+38 −0
Original line number Diff line number Diff line
@@ -9722,6 +9722,40 @@ static void gen_tcheck(DisasContext *ctx) 
    tcg_gen_movi_i32(cpu_crf[crfD(ctx->opcode)], 0x8);

}



#if defined(CONFIG_USER_ONLY)

#define GEN_TM_PRIV_NOOP(name)                                 \

static inline void gen_##name(DisasContext *ctx)               \

{                                                              \

    gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);           \

}



#else



#define GEN_TM_PRIV_NOOP(name)                                 \

static inline void gen_##name(DisasContext *ctx)               \

{                                                              \

    if (unlikely(ctx->pr)) {                                   \

        gen_inval_exception(ctx, POWERPC_EXCP_PRIV_OPC);       \

        return;                                                \

    }                                                          \

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

        gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_TM);   \

        return;                                                \

    }                                                          \

    /* Because tbegin always fails, the implementation is      \

     * simple:                                                 \

     *                                                         \

     *   CR[0] = 0b0 || MSR[TS] || 0b0                         \

     *         = 0b0 || 0b00 | 0b0                             \

     */                                                        \

    tcg_gen_movi_i32(cpu_crf[0], 0);                           \

}



#endif



GEN_TM_PRIV_NOOP(treclaim);

GEN_TM_PRIV_NOOP(trechkpt);



static opcode_t opcodes[] = {

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

GEN_HANDLER(cmp, 0x1F, 0x00, 0x00, 0x00400000, PPC_INTEGER),
@@ -11153,6 +11187,10 @@ 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),

GEN_HANDLER2_E(treclaim, "treclaim", 0x1F, 0x0E, 0x1D, 0x03E0F800, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(trechkpt, "trechkpt", 0x1F, 0x0E, 0x1F, 0x03FFF800, \

               PPC_NONE, PPC2_TM),

};



#include "helper_regs.h"