Commit 56a84615 authored by Tom Musta's avatar Tom Musta Committed by Alexander Graf
Browse files

target-ppc: Introduce TM Noops 



Add degenerate implementations of the non-privileged Transactional
Memory instructions tend., tabort*. and tsr.  This implementation
simply checks the MSR[TM] bit and then sets CR0 to 0b0000.  This
is a reasonable degenerate implementation since transactions are
never allowed to begin and hence MSR[TS] is always 0b00.

Signed-off-by: default avatarTom Musta <tommusta@gmail.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 0ff93d11

target-ppc/translate.c

+38 −0
Original line number Diff line number Diff line
@@ -9683,6 +9683,30 @@ static void gen_tbegin(DisasContext *ctx) 
    gen_helper_tbegin(cpu_env);

}



#define GEN_TM_NOOP(name)                                      \

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

{                                                              \

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

        gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_TM);   \

        return;                                                \

    }                                                          \

    /* Because tbegin always fails in QEMU, these user         \

     * space instructions all have a simple implementation:    \

     *                                                         \

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

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

     */                                                        \

    tcg_gen_movi_i32(cpu_crf[0], 0);                           \

}



GEN_TM_NOOP(tend);

GEN_TM_NOOP(tabort);

GEN_TM_NOOP(tabortwc);

GEN_TM_NOOP(tabortwci);

GEN_TM_NOOP(tabortdc);

GEN_TM_NOOP(tabortdci);

GEN_TM_NOOP(tsr);



static opcode_t opcodes[] = {

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

GEN_HANDLER(cmp, 0x1F, 0x00, 0x00, 0x00400000, PPC_INTEGER),
@@ -11098,6 +11122,20 @@ GEN_SPEOP_LDST(evstwwo, 0x1E, 2), 


GEN_HANDLER2_E(tbegin, "tbegin", 0x1F, 0x0E, 0x14, 0x01DFF800, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tend,   "tend",   0x1F, 0x0E, 0x15, 0x01FFF800, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tabort, "tabort", 0x1F, 0x0E, 0x1C, 0x03E0F800, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tabortwc, "tabortwc", 0x1F, 0x0E, 0x18, 0x00000000, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tabortwci, "tabortwci", 0x1F, 0x0E, 0x1A, 0x00000000, \

               PPC_NONE, PPC2_TM),

GEN_HANDLER2_E(tabortdc, "tabortdc", 0x1F, 0x0E, 0x19, 0x00000000, \

               PPC_NONE, PPC2_TM),

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),

};



#include "helper_regs.h"