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target-arm: Add support for A32 and T32 HVC and SMC insns

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Add support for HVC and SMC instructions to the A32 and
T32 decoder. Using these for real exceptions to EL2 or EL3
is currently not supported (the do_interrupt routine does
not handle them) but we require the instruction support to
implement PSCI.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1412865028-17725-6-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2014-10-24 12:19:13 +01:00
parent 3940433843
commit 37e6456ef5
3 changed files with 104 additions and 11 deletions
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10
target-arm/internals.h
View File

@ -236,6 +236,16 @@ static inline uint32_t syn_aa32_svc(uint32_t imm16, bool is_thumb)
| (is_thumb ? 0 : ARM_EL_IL);
}
static inline uint32_t syn_aa32_hvc(uint32_t imm16)
{
return (EC_AA32_HVC << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);
}
static inline uint32_t syn_aa32_smc(void)
{
return (EC_AA32_SMC << ARM_EL_EC_SHIFT) | ARM_EL_IL;
}
static inline uint32_t syn_aa64_bkpt(uint32_t imm16)
{
return (EC_AA64_BKPT << ARM_EL_EC_SHIFT) | ARM_EL_IL | (imm16 & 0xffff);

103
target-arm/translate.c
View File

@ -941,6 +941,39 @@ static inline void gen_set_pc_im(DisasContext *s, target_ulong val)
tcg_gen_movi_i32(cpu_R[15], val);
}
static inline void gen_hvc(DisasContext *s, int imm16)
{
/* The pre HVC helper handles cases when HVC gets trapped
* as an undefined insn by runtime configuration (ie before
* the insn really executes).
*/
gen_set_pc_im(s, s->pc - 4);
gen_helper_pre_hvc(cpu_env);
/* Otherwise we will treat this as a real exception which
* happens after execution of the insn. (The distinction matters
* for the PC value reported to the exception handler and also
* for single stepping.)
*/
s->svc_imm = imm16;
gen_set_pc_im(s, s->pc);
s->is_jmp = DISAS_HVC;
}
static inline void gen_smc(DisasContext *s)
{
/* As with HVC, we may take an exception either before or after
* the insn executes.
*/
TCGv_i32 tmp;
gen_set_pc_im(s, s->pc - 4);
tmp = tcg_const_i32(syn_aa32_smc());
gen_helper_pre_smc(cpu_env, tmp);
tcg_temp_free_i32(tmp);
gen_set_pc_im(s, s->pc);
s->is_jmp = DISAS_SMC;
}
static inline void
gen_set_condexec (DisasContext *s)
{
@ -7872,15 +7905,32 @@ static void disas_arm_insn(CPUARMState * env, DisasContext *s)
case 7:
{
int imm16 = extract32(insn, 0, 4) | (extract32(insn, 8, 12) << 4);
/* SMC instruction (op1 == 3)
and undefined instructions (op1 == 0 || op1 == 2)
will trap */
if (op1 != 1) {
goto illegal_op;
}
switch (op1) {
case 1:
/* bkpt */
ARCH(5);
gen_exception_insn(s, 4, EXCP_BKPT, syn_aa32_bkpt(imm16, false));
gen_exception_insn(s, 4, EXCP_BKPT,
syn_aa32_bkpt(imm16, false));
break;
case 2:
/* Hypervisor call (v7) */
ARCH(7);
if (IS_USER(s)) {
goto illegal_op;
}
gen_hvc(s, imm16);
break;
case 3:
/* Secure monitor call (v6+) */
ARCH(6K);
if (IS_USER(s)) {
goto illegal_op;
}
gen_smc(s);
break;
default:
goto illegal_op;
}
break;
}
case 0x8: /* signed multiply */
@ -9710,10 +9760,23 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
goto illegal_op;
if (insn & (1 << 26)) {
/* Secure monitor call (v6Z) */
qemu_log_mask(LOG_UNIMP,
"arm: unimplemented secure monitor call\n");
goto illegal_op; /* not implemented. */
if (!(insn & (1 << 20))) {
/* Hypervisor call (v7) */
int imm16 = extract32(insn, 16, 4) << 12
| extract32(insn, 0, 12);
ARCH(7);
if (IS_USER(s)) {
goto illegal_op;
}
gen_hvc(s, imm16);
} else {
/* Secure monitor call (v6+) */
ARCH(6K);
if (IS_USER(s)) {
goto illegal_op;
}
gen_smc(s);
}
} else {
op = (insn >> 20) & 7;
switch (op) {
@ -11148,6 +11211,12 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
if (dc->is_jmp == DISAS_SWI) {
gen_ss_advance(dc);
gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
} else if (dc->is_jmp == DISAS_HVC) {
gen_ss_advance(dc);
gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
} else if (dc->is_jmp == DISAS_SMC) {
gen_ss_advance(dc);
gen_exception(EXCP_SMC, syn_aa32_smc());
} else if (dc->ss_active) {
gen_step_complete_exception(dc);
} else {
@ -11163,6 +11232,12 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
if (dc->is_jmp == DISAS_SWI && !dc->condjmp) {
gen_ss_advance(dc);
gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
} else if (dc->is_jmp == DISAS_HVC && !dc->condjmp) {
gen_ss_advance(dc);
gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
} else if (dc->is_jmp == DISAS_SMC && !dc->condjmp) {
gen_ss_advance(dc);
gen_exception(EXCP_SMC, syn_aa32_smc());
} else if (dc->ss_active) {
gen_step_complete_exception(dc);
} else {
@ -11202,6 +11277,12 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
case DISAS_SWI:
gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
break;
case DISAS_HVC:
gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
break;
case DISAS_SMC:
gen_exception(EXCP_SMC, syn_aa32_smc());
break;
}
if (dc->condjmp) {
gen_set_label(dc->condlabel);

2
target-arm/translate.h
View File

@ -84,6 +84,8 @@ static inline int get_mem_index(DisasContext *s)
#define DISAS_EXC 6
/* WFE */
#define DISAS_WFE 7
#define DISAS_HVC 8
#define DISAS_SMC 9
#ifdef TARGET_AARCH64
void a64_translate_init(void);