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target-xtensa: implement unaligned exception option 

See ISA, 4.4.4 for details.

Correct (aligned as per ISA) address for unaligned access is generated
in case this option is not enabled.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2011-09-06 03:55:46 +04:00 committed by Blue Swirl
parent 6ad6dbf791
commit 5b4e481b04
3 changed files with 73 additions and 4 deletions
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4
target-xtensa/helper.c
View File

@ -45,7 +45,9 @@ void cpu_reset(CPUXtensaState *env)
static const XtensaConfig core_config[] = {
{
.name = "sample-xtensa-core",
.options = -1,
.options = -1 ^
(XTENSA_OPTION_BIT(XTENSA_OPTION_HW_ALIGNMENT) |
XTENSA_OPTION_BIT(XTENSA_OPTION_MMU)),
.nareg = 64,
.ndepc = 1,
.excm_level = 16,

26
target-xtensa/op_helper.c
View File

@ -30,6 +30,10 @@
#include "helpers.h"
#include "host-utils.h"
static void do_unaligned_access(target_ulong addr, int is_write, int is_user,
void *retaddr);
#define ALIGNED_ONLY
#define MMUSUFFIX _mmu
#define SHIFT 0
@ -44,6 +48,28 @@
#define SHIFT 3
#include "softmmu_template.h"
static void do_restore_state(void *pc_ptr)
{
TranslationBlock *tb;
uint32_t pc = (uint32_t)(intptr_t)pc_ptr;
tb = tb_find_pc(pc);
if (tb) {
cpu_restore_state(tb, env, pc);
}
}
static void do_unaligned_access(target_ulong addr, int is_write, int is_user,
void *retaddr)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_UNALIGNED_EXCEPTION) &&
!xtensa_option_enabled(env->config, XTENSA_OPTION_HW_ALIGNMENT)) {
do_restore_state(retaddr);
HELPER(exception_cause_vaddr)(
env->pc, LOAD_STORE_ALIGNMENT_CAUSE, addr);
}
}
void tlb_fill(target_ulong addr, int is_write, int mmu_idx, void *retaddr)
{
tlb_set_page(cpu_single_env,

47
target-xtensa/translate.c
View File

@ -203,6 +203,16 @@ static void gen_exception_cause(DisasContext *dc, uint32_t cause)
tcg_temp_free(tcause);
}
static void gen_exception_cause_vaddr(DisasContext *dc, uint32_t cause,
TCGv_i32 vaddr)
{
TCGv_i32 tpc = tcg_const_i32(dc->pc);
TCGv_i32 tcause = tcg_const_i32(cause);
gen_helper_exception_cause_vaddr(tpc, tcause, vaddr);
tcg_temp_free(tpc);
tcg_temp_free(tcause);
}
static void gen_check_privilege(DisasContext *dc)
{
if (dc->cring) {
@ -397,6 +407,23 @@ static void gen_wsr(DisasContext *dc, uint32_t sr, TCGv_i32 s)
}
}
static void gen_load_store_alignment(DisasContext *dc, int shift,
TCGv_i32 addr, bool no_hw_alignment)
{
if (!option_enabled(dc, XTENSA_OPTION_UNALIGNED_EXCEPTION)) {
tcg_gen_andi_i32(addr, addr, ~0 << shift);
} else if (option_enabled(dc, XTENSA_OPTION_HW_ALIGNMENT) &&
no_hw_alignment) {
int label = gen_new_label();
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp, addr, ~(~0 << shift));
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
gen_exception_cause_vaddr(dc, LOAD_STORE_ALIGNMENT_CAUSE, addr);
gen_set_label(label);
tcg_temp_free(tmp);
}
}
static void disas_xtensa_insn(DisasContext *dc)
{
#define HAS_OPTION(opt) do { \
@ -1339,6 +1366,9 @@ static void disas_xtensa_insn(DisasContext *dc)
#define gen_load_store(type, shift) do { \
TCGv_i32 addr = tcg_temp_new_i32(); \
tcg_gen_addi_i32(addr, cpu_R[RRI8_S], RRI8_IMM8 << shift); \
if (shift) { \
gen_load_store_alignment(dc, shift, addr, false); \
} \
tcg_gen_qemu_##type(cpu_R[RRI8_T], addr, dc->cring); \
tcg_temp_free(addr); \
} while (0)
@ -1468,6 +1498,7 @@ static void disas_xtensa_insn(DisasContext *dc)
case 9: /*L16SI*/
gen_load_store(ld16s, 1);
break;
#undef gen_load_store
case 10: /*MOVI*/
tcg_gen_movi_i32(cpu_R[RRI8_T],
@ -1475,9 +1506,17 @@ static void disas_xtensa_insn(DisasContext *dc)
((RRI8_S & 0x8) ? 0xfffff000 : 0));
break;
#define gen_load_store_no_hw_align(type) do { \
TCGv_i32 addr = tcg_temp_local_new_i32(); \
tcg_gen_addi_i32(addr, cpu_R[RRI8_S], RRI8_IMM8 << 2); \
gen_load_store_alignment(dc, 2, addr, true); \
tcg_gen_qemu_##type(cpu_R[RRI8_T], addr, dc->cring); \
tcg_temp_free(addr); \
} while (0)
case 11: /*L32AIy*/
HAS_OPTION(XTENSA_OPTION_MP_SYNCHRO);
gen_load_store(ld32u, 2); /*TODO acquire?*/
gen_load_store_no_hw_align(ld32u); /*TODO acquire?*/
break;
case 12: /*ADDI*/
@ -1497,6 +1536,7 @@ static void disas_xtensa_insn(DisasContext *dc)
tcg_gen_mov_i32(tmp, cpu_R[RRI8_T]);
tcg_gen_addi_i32(addr, cpu_R[RRI8_S], RRI8_IMM8 << 2);
gen_load_store_alignment(dc, 2, addr, true);
tcg_gen_qemu_ld32u(cpu_R[RRI8_T], addr, dc->cring);
tcg_gen_brcond_i32(TCG_COND_NE, cpu_R[RRI8_T],
cpu_SR[SCOMPARE1], label);
@ -1511,15 +1551,15 @@ static void disas_xtensa_insn(DisasContext *dc)
case 15: /*S32RIy*/
HAS_OPTION(XTENSA_OPTION_MP_SYNCHRO);
gen_load_store(st32, 2); /*TODO release?*/
gen_load_store_no_hw_align(st32); /*TODO release?*/
break;
#undef gen_load_store_no_hw_align
default: /*reserved*/
RESERVED();
break;
}
break;
#undef gen_load_store
case 3: /*LSCIp*/
HAS_OPTION(XTENSA_OPTION_COPROCESSOR);
@ -1725,6 +1765,7 @@ static void disas_xtensa_insn(DisasContext *dc)
#define gen_narrow_load_store(type) do { \
TCGv_i32 addr = tcg_temp_new_i32(); \
tcg_gen_addi_i32(addr, cpu_R[RRRN_S], RRRN_R << 2); \
gen_load_store_alignment(dc, 2, addr, false); \
tcg_gen_qemu_##type(cpu_R[RRRN_T], addr, dc->cring); \
tcg_temp_free(addr); \
} while (0)