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target-arm: Implement AArch64 CurrentEL sysreg

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Implement the CurrentEL sysreg.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Maydell 2014-02-26 17:20:02 +00:00
parent 7da845b0f4
commit 0eef9d9833
3 changed files with 12 additions and 1 deletions
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3
target-arm/cpu.h
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@ -731,7 +731,8 @@ static inline uint64_t cpreg_to_kvm_id(uint32_t cpregid)
#define ARM_CP_NOP (ARM_CP_SPECIAL | (1 << 8))
#define ARM_CP_WFI (ARM_CP_SPECIAL | (2 << 8))
#define ARM_CP_NZCV (ARM_CP_SPECIAL | (3 << 8))
#define ARM_LAST_SPECIAL ARM_CP_NZCV
#define ARM_CP_CURRENTEL (ARM_CP_SPECIAL | (4 << 8))
#define ARM_LAST_SPECIAL ARM_CP_CURRENTEL
/* Used only as a terminator for ARMCPRegInfo lists */
#define ARM_CP_SENTINEL 0xffff
/* Mask of only the flag bits in a type field */

3
target-arm/helper.c
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@ -1533,6 +1533,9 @@ static const ARMCPRegInfo v8_cp_reginfo[] = {
.opc0 = 3, .opc1 = 3, .opc2 = 7, .crn = 0, .crm = 0,
.access = PL0_R, .type = ARM_CP_CONST,
.resetvalue = 0x10 },
{ .name = "CURRENTEL", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .opc2 = 2, .crn = 4, .crm = 2,
.access = PL1_R, .type = ARM_CP_CURRENTEL },
REGINFO_SENTINEL
};

7
target-arm/translate-a64.c
View File

@ -1231,6 +1231,13 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
gen_set_nzcv(tcg_rt);
}
return;
case ARM_CP_CURRENTEL:
/* Reads as current EL value from pstate, which is
* guaranteed to be constant by the tb flags.
*/
tcg_rt = cpu_reg(s, rt);
tcg_gen_movi_i64(tcg_rt, s->current_pl << 2);
return;
default:
break;
}