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target-ppc: add exceptions for conditional stores 

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: malc <av1474@comtv.ru>
This commit is contained in:
Nathan Froyd 2009-08-03 08:43:26 -07:00 committed by malc
parent 18b21a2f83
commit 4425265beb
2 changed files with 56 additions and 20 deletions
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5
target-ppc/cpu.h
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@ -218,6 +218,7 @@ enum {
/* Qemu exceptions: special cases we want to stop translation */
POWERPC_EXCP_SYNC = 0x202, /* context synchronizing instruction */
POWERPC_EXCP_SYSCALL_USER = 0x203, /* System call in user mode only */
POWERPC_EXCP_STCX = 0x204 /* Conditional stores in user mode */
};
/* Exceptions error codes */
@ -564,6 +565,10 @@ struct CPUPPCState {
target_ulong reserve_addr;
/* Reservation value */
target_ulong reserve_val;
/* Reservation store address */
target_ulong reserve_ea;
/* Reserved store source register and size */
target_ulong reserve_info;
/* Those ones are used in supervisor mode only */
/* machine state register */

71
target-ppc/translate.c
View File

@ -3018,24 +3018,49 @@ static void gen_lwarx(DisasContext *ctx)
tcg_temp_free(t0);
}
#if defined(CONFIG_USER_ONLY)
static void gen_conditional_store (DisasContext *ctx, TCGv EA,
int reg, int size)
{
TCGv t0 = tcg_temp_new();
uint32_t save_exception = ctx->exception;
tcg_gen_st_tl(EA, cpu_env, offsetof(CPUState, reserve_ea));
tcg_gen_movi_tl(t0, (size << 5) | reg);
tcg_gen_st_tl(t0, cpu_env, offsetof(CPUState, reserve_info));
tcg_temp_free(t0);
gen_update_nip(ctx, ctx->nip-4);
ctx->exception = POWERPC_EXCP_BRANCH;
gen_exception(ctx, POWERPC_EXCP_STCX);
ctx->exception = save_exception;
}
#endif
/* stwcx. */
static void gen_stwcx_(DisasContext *ctx)
{
int l1;
TCGv t0;
gen_set_access_type(ctx, ACCESS_RES);
t0 = tcg_temp_local_new();
gen_addr_reg_index(ctx, t0);
gen_check_align(ctx, t0, 0x03);
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_xer);
tcg_gen_shri_i32(cpu_crf[0], cpu_crf[0], XER_SO);
tcg_gen_andi_i32(cpu_crf[0], cpu_crf[0], 1);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st32(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
#if defined(CONFIG_USER_ONLY)
gen_conditional_store(ctx, t0, rS(ctx->opcode), 4);
#else
{
int l1;
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_xer);
tcg_gen_shri_i32(cpu_crf[0], cpu_crf[0], XER_SO);
tcg_gen_andi_i32(cpu_crf[0], cpu_crf[0], 1);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st32(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
}
#endif
tcg_temp_free(t0);
}
@ -3058,21 +3083,27 @@ static void gen_ldarx(DisasContext *ctx)
/* stdcx. */
static void gen_stdcx_(DisasContext *ctx)
{
int l1;
TCGv t0;
gen_set_access_type(ctx, ACCESS_RES);
t0 = tcg_temp_local_new();
gen_addr_reg_index(ctx, t0);
gen_check_align(ctx, t0, 0x07);
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_xer);
tcg_gen_shri_i32(cpu_crf[0], cpu_crf[0], XER_SO);
tcg_gen_andi_i32(cpu_crf[0], cpu_crf[0], 1);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st64(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
#if defined(CONFIG_USER_ONLY)
gen_conditional_store(ctx, t0, rS(ctx->opcode), 8);
#else
{
int l1;
tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_xer);
tcg_gen_shri_i32(cpu_crf[0], cpu_crf[0], XER_SO);
tcg_gen_andi_i32(cpu_crf[0], cpu_crf[0], 1);
l1 = gen_new_label();
tcg_gen_brcond_tl(TCG_COND_NE, t0, cpu_reserve, l1);
tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], 1 << CRF_EQ);
gen_qemu_st64(ctx, cpu_gpr[rS(ctx->opcode)], t0);
gen_set_label(l1);
tcg_gen_movi_tl(cpu_reserve, -1);
}
#endif
tcg_temp_free(t0);
}
#endif /* defined(TARGET_PPC64) */