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helper.c
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helper.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cpu.h"
#include "exec-all.h"
#include "gdbstub.h"
#include "helpers.h"
#include "qemu-common.h"
#include "host-utils.h"
static uint32_t cortexa8_cp15_c0_c1[8] =
{ 0x1031, 0x11, 0x400, 0, 0x31100003, 0x20000000, 0x01202000, 0x11 };
static uint32_t cortexa8_cp15_c0_c2[8] =
{ 0x00101111, 0x12112111, 0x21232031, 0x11112131, 0x00111142, 0, 0, 0 };
static uint32_t mpcore_cp15_c0_c1[8] =
{ 0x111, 0x1, 0, 0x2, 0x01100103, 0x10020302, 0x01222000, 0 };
static uint32_t mpcore_cp15_c0_c2[8] =
{ 0x00100011, 0x12002111, 0x11221011, 0x01102131, 0x141, 0, 0, 0 };
static uint32_t arm1136_cp15_c0_c1[8] =
{ 0x111, 0x1, 0x2, 0x3, 0x01130003, 0x10030302, 0x01222110, 0 };
static uint32_t arm1136_cp15_c0_c2[8] =
{ 0x00140011, 0x12002111, 0x11231111, 0x01102131, 0x141, 0, 0, 0 };
static uint32_t cpu_arm_find_by_name(const char *name);
static inline void set_feature(CPUARMState *env, int feature)
{
env->features |= 1u << feature;
}
static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
{
env->cp15.c0_cpuid = id;
switch (id) {
case ARM_CPUID_ARM926:
set_feature(env, ARM_FEATURE_VFP);
env->vfp.xregs[ARM_VFP_FPSID] = 0x41011090;
env->cp15.c0_cachetype = 0x1dd20d2;
env->cp15.c1_sys = 0x00090078;
break;
case ARM_CPUID_ARM946:
set_feature(env, ARM_FEATURE_MPU);
env->cp15.c0_cachetype = 0x0f004006;
env->cp15.c1_sys = 0x00000078;
break;
case ARM_CPUID_ARM1026:
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_AUXCR);
env->vfp.xregs[ARM_VFP_FPSID] = 0x410110a0;
env->cp15.c0_cachetype = 0x1dd20d2;
env->cp15.c1_sys = 0x00090078;
break;
case ARM_CPUID_ARM1136_R2:
case ARM_CPUID_ARM1136:
set_feature(env, ARM_FEATURE_V6);
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_AUXCR);
env->vfp.xregs[ARM_VFP_FPSID] = 0x410120b4;
env->vfp.xregs[ARM_VFP_MVFR0] = 0x11111111;
env->vfp.xregs[ARM_VFP_MVFR1] = 0x00000000;
memcpy(env->cp15.c0_c1, arm1136_cp15_c0_c1, 8 * sizeof(uint32_t));
memcpy(env->cp15.c0_c2, arm1136_cp15_c0_c2, 8 * sizeof(uint32_t));
env->cp15.c0_cachetype = 0x1dd20d2;
break;
case ARM_CPUID_ARM11MPCORE:
set_feature(env, ARM_FEATURE_V6);
set_feature(env, ARM_FEATURE_V6K);
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_AUXCR);
env->vfp.xregs[ARM_VFP_FPSID] = 0x410120b4;
env->vfp.xregs[ARM_VFP_MVFR0] = 0x11111111;
env->vfp.xregs[ARM_VFP_MVFR1] = 0x00000000;
memcpy(env->cp15.c0_c1, mpcore_cp15_c0_c1, 8 * sizeof(uint32_t));
memcpy(env->cp15.c0_c2, mpcore_cp15_c0_c2, 8 * sizeof(uint32_t));
env->cp15.c0_cachetype = 0x1dd20d2;
break;
case ARM_CPUID_CORTEXA8:
set_feature(env, ARM_FEATURE_V6);
set_feature(env, ARM_FEATURE_V6K);
set_feature(env, ARM_FEATURE_V7);
set_feature(env, ARM_FEATURE_AUXCR);
set_feature(env, ARM_FEATURE_THUMB2);
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_VFP3);
set_feature(env, ARM_FEATURE_NEON);
set_feature(env, ARM_FEATURE_THUMB2EE);
env->vfp.xregs[ARM_VFP_FPSID] = 0x410330c0;
env->vfp.xregs[ARM_VFP_MVFR0] = 0x11110222;
env->vfp.xregs[ARM_VFP_MVFR1] = 0x00011100;
memcpy(env->cp15.c0_c1, cortexa8_cp15_c0_c1, 8 * sizeof(uint32_t));
memcpy(env->cp15.c0_c2, cortexa8_cp15_c0_c2, 8 * sizeof(uint32_t));
env->cp15.c0_cachetype = 0x82048004;
env->cp15.c0_clid = (1 << 27) | (2 << 24) | 3;
env->cp15.c0_ccsid[0] = 0xe007e01a; /* 16k L1 dcache. */
env->cp15.c0_ccsid[1] = 0x2007e01a; /* 16k L1 icache. */
env->cp15.c0_ccsid[2] = 0xf0000000; /* No L2 icache. */
break;
case ARM_CPUID_CORTEXM3:
set_feature(env, ARM_FEATURE_V6);
set_feature(env, ARM_FEATURE_THUMB2);
set_feature(env, ARM_FEATURE_V7);
set_feature(env, ARM_FEATURE_M);
set_feature(env, ARM_FEATURE_DIV);
break;
case ARM_CPUID_ANY: /* For userspace emulation. */
set_feature(env, ARM_FEATURE_V6);
set_feature(env, ARM_FEATURE_V6K);
set_feature(env, ARM_FEATURE_V7);
set_feature(env, ARM_FEATURE_THUMB2);
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_VFP3);
set_feature(env, ARM_FEATURE_NEON);
set_feature(env, ARM_FEATURE_THUMB2EE);
set_feature(env, ARM_FEATURE_DIV);
break;
case ARM_CPUID_TI915T:
case ARM_CPUID_TI925T:
set_feature(env, ARM_FEATURE_OMAPCP);
env->cp15.c0_cpuid = ARM_CPUID_TI925T; /* Depends on wiring. */
env->cp15.c0_cachetype = 0x5109149;
env->cp15.c1_sys = 0x00000070;
env->cp15.c15_i_max = 0x000;
env->cp15.c15_i_min = 0xff0;
break;
case ARM_CPUID_PXA250:
case ARM_CPUID_PXA255:
case ARM_CPUID_PXA260:
case ARM_CPUID_PXA261:
case ARM_CPUID_PXA262:
set_feature(env, ARM_FEATURE_XSCALE);
/* JTAG_ID is ((id << 28) | 0x09265013) */
env->cp15.c0_cachetype = 0xd172172;
env->cp15.c1_sys = 0x00000078;
break;
case ARM_CPUID_PXA270_A0:
case ARM_CPUID_PXA270_A1:
case ARM_CPUID_PXA270_B0:
case ARM_CPUID_PXA270_B1:
case ARM_CPUID_PXA270_C0:
case ARM_CPUID_PXA270_C5:
set_feature(env, ARM_FEATURE_XSCALE);
/* JTAG_ID is ((id << 28) | 0x09265013) */
set_feature(env, ARM_FEATURE_IWMMXT);
env->iwmmxt.cregs[ARM_IWMMXT_wCID] = 0x69051000 | 'Q';
env->cp15.c0_cachetype = 0xd172172;
env->cp15.c1_sys = 0x00000078;
break;
default:
cpu_abort(env, "Bad CPU ID: %x\n", id);
break;
}
}
void cpu_reset(CPUARMState *env)
{
uint32_t id;
if (qemu_loglevel_mask(CPU_LOG_RESET)) {
qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
log_cpu_state(env, 0);
}
id = env->cp15.c0_cpuid;
memset(env, 0, offsetof(CPUARMState, breakpoints));
if (id)
cpu_reset_model_id(env, id);
#if defined (CONFIG_USER_ONLY)
env->uncached_cpsr = ARM_CPU_MODE_USR;
env->vfp.xregs[ARM_VFP_FPEXC] = 1 << 30;
#else
/* SVC mode with interrupts disabled. */
env->uncached_cpsr = ARM_CPU_MODE_SVC | CPSR_A | CPSR_F | CPSR_I;
/* On ARMv7-M the CPSR_I is the value of the PRIMASK register, and is
clear at reset. */
if (IS_M(env))
env->uncached_cpsr &= ~CPSR_I;
env->vfp.xregs[ARM_VFP_FPEXC] = 0;
env->cp15.c2_base_mask = 0xffffc000u;
#endif
env->regs[15] = 0;
tlb_flush(env, 1);
}
static int vfp_gdb_get_reg(CPUState *env, uint8_t *buf, int reg)
{
int nregs;
/* VFP data registers are always little-endian. */
nregs = arm_feature(env, ARM_FEATURE_VFP3) ? 32 : 16;
if (reg < nregs) {
stfq_le_p(buf, env->vfp.regs[reg]);
return 8;
}
if (arm_feature(env, ARM_FEATURE_NEON)) {
/* Aliases for Q regs. */
nregs += 16;
if (reg < nregs) {
stfq_le_p(buf, env->vfp.regs[(reg - 32) * 2]);
stfq_le_p(buf + 8, env->vfp.regs[(reg - 32) * 2 + 1]);
return 16;
}
}
switch (reg - nregs) {
case 0: stl_p(buf, env->vfp.xregs[ARM_VFP_FPSID]); return 4;
case 1: stl_p(buf, env->vfp.xregs[ARM_VFP_FPSCR]); return 4;
case 2: stl_p(buf, env->vfp.xregs[ARM_VFP_FPEXC]); return 4;
}
return 0;
}
static int vfp_gdb_set_reg(CPUState *env, uint8_t *buf, int reg)
{
int nregs;
nregs = arm_feature(env, ARM_FEATURE_VFP3) ? 32 : 16;
if (reg < nregs) {
env->vfp.regs[reg] = ldfq_le_p(buf);
return 8;
}
if (arm_feature(env, ARM_FEATURE_NEON)) {
nregs += 16;
if (reg < nregs) {
env->vfp.regs[(reg - 32) * 2] = ldfq_le_p(buf);
env->vfp.regs[(reg - 32) * 2 + 1] = ldfq_le_p(buf + 8);
return 16;
}
}
switch (reg - nregs) {
case 0: env->vfp.xregs[ARM_VFP_FPSID] = ldl_p(buf); return 4;
case 1: env->vfp.xregs[ARM_VFP_FPSCR] = ldl_p(buf); return 4;
case 2: env->vfp.xregs[ARM_VFP_FPEXC] = ldl_p(buf) & (1 << 30); return 4;
}
return 0;
}
CPUARMState *cpu_arm_init(const char *cpu_model)
{
CPUARMState *env;
uint32_t id;
static int inited = 0;
id = cpu_arm_find_by_name(cpu_model);
if (id == 0)
return NULL;
env = qemu_mallocz(sizeof(CPUARMState));
cpu_exec_init(env);
if (!inited) {
inited = 1;
arm_translate_init();
}
env->cpu_model_str = cpu_model;
env->cp15.c0_cpuid = id;
cpu_reset(env);
if (arm_feature(env, ARM_FEATURE_NEON)) {
gdb_register_coprocessor(env, vfp_gdb_get_reg, vfp_gdb_set_reg,
51, "arm-neon.xml", 0);
} else if (arm_feature(env, ARM_FEATURE_VFP3)) {
gdb_register_coprocessor(env, vfp_gdb_get_reg, vfp_gdb_set_reg,
35, "arm-vfp3.xml", 0);
} else if (arm_feature(env, ARM_FEATURE_VFP)) {
gdb_register_coprocessor(env, vfp_gdb_get_reg, vfp_gdb_set_reg,
19, "arm-vfp.xml", 0);
}
qemu_init_vcpu(env);
return env;
}
struct arm_cpu_t {
uint32_t id;
const char *name;
};
static const struct arm_cpu_t arm_cpu_names[] = {
{ ARM_CPUID_ARM926, "arm926"},
{ ARM_CPUID_ARM946, "arm946"},
{ ARM_CPUID_ARM1026, "arm1026"},
{ ARM_CPUID_ARM1136, "arm1136"},
{ ARM_CPUID_ARM1136_R2, "arm1136-r2"},
{ ARM_CPUID_ARM11MPCORE, "arm11mpcore"},
{ ARM_CPUID_CORTEXM3, "cortex-m3"},
{ ARM_CPUID_CORTEXA8, "cortex-a8"},
{ ARM_CPUID_TI925T, "ti925t" },
{ ARM_CPUID_PXA250, "pxa250" },
{ ARM_CPUID_PXA255, "pxa255" },
{ ARM_CPUID_PXA260, "pxa260" },
{ ARM_CPUID_PXA261, "pxa261" },
{ ARM_CPUID_PXA262, "pxa262" },
{ ARM_CPUID_PXA270, "pxa270" },
{ ARM_CPUID_PXA270_A0, "pxa270-a0" },
{ ARM_CPUID_PXA270_A1, "pxa270-a1" },
{ ARM_CPUID_PXA270_B0, "pxa270-b0" },
{ ARM_CPUID_PXA270_B1, "pxa270-b1" },
{ ARM_CPUID_PXA270_C0, "pxa270-c0" },
{ ARM_CPUID_PXA270_C5, "pxa270-c5" },
{ ARM_CPUID_ANY, "any"},
{ 0, NULL}
};
void arm_cpu_list(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...))
{
int i;
(*cpu_fprintf)(f, "Available CPUs:\n");
for (i = 0; arm_cpu_names[i].name; i++) {
(*cpu_fprintf)(f, " %s\n", arm_cpu_names[i].name);
}
}
/* return 0 if not found */
static uint32_t cpu_arm_find_by_name(const char *name)
{
int i;
uint32_t id;
id = 0;
for (i = 0; arm_cpu_names[i].name; i++) {
if (strcmp(name, arm_cpu_names[i].name) == 0) {
id = arm_cpu_names[i].id;
break;
}
}
return id;
}
void cpu_arm_close(CPUARMState *env)
{
free(env);
}
uint32_t cpsr_read(CPUARMState *env)
{
int ZF;
ZF = (env->ZF == 0);
return env->uncached_cpsr | (env->NF & 0x80000000) | (ZF << 30) |
(env->CF << 29) | ((env->VF & 0x80000000) >> 3) | (env->QF << 27)
| (env->thumb << 5) | ((env->condexec_bits & 3) << 25)
| ((env->condexec_bits & 0xfc) << 8)
| (env->GE << 16);
}
void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask)
{
if (mask & CPSR_NZCV) {
env->ZF = (~val) & CPSR_Z;
env->NF = val;
env->CF = (val >> 29) & 1;
env->VF = (val << 3) & 0x80000000;
}
if (mask & CPSR_Q)
env->QF = ((val & CPSR_Q) != 0);
if (mask & CPSR_T)
env->thumb = ((val & CPSR_T) != 0);
if (mask & CPSR_IT_0_1) {
env->condexec_bits &= ~3;
env->condexec_bits |= (val >> 25) & 3;
}
if (mask & CPSR_IT_2_7) {
env->condexec_bits &= 3;
env->condexec_bits |= (val >> 8) & 0xfc;
}
if (mask & CPSR_GE) {
env->GE = (val >> 16) & 0xf;
}
if ((env->uncached_cpsr ^ val) & mask & CPSR_M) {
switch_mode(env, val & CPSR_M);
}
mask &= ~CACHED_CPSR_BITS;
env->uncached_cpsr = (env->uncached_cpsr & ~mask) | (val & mask);
}
/* Sign/zero extend */
uint32_t HELPER(sxtb16)(uint32_t x)
{
uint32_t res;
res = (uint16_t)(int8_t)x;
res |= (uint32_t)(int8_t)(x >> 16) << 16;
return res;
}
uint32_t HELPER(uxtb16)(uint32_t x)
{
uint32_t res;
res = (uint16_t)(uint8_t)x;
res |= (uint32_t)(uint8_t)(x >> 16) << 16;
return res;
}
uint32_t HELPER(clz)(uint32_t x)
{
return clz32(x);
}
int32_t HELPER(sdiv)(int32_t num, int32_t den)
{
if (den == 0)
return 0;
if (num == INT_MIN && den == -1)
return INT_MIN;
return num / den;
}
uint32_t HELPER(udiv)(uint32_t num, uint32_t den)
{
if (den == 0)
return 0;
return num / den;
}
uint32_t HELPER(rbit)(uint32_t x)
{
x = ((x & 0xff000000) >> 24)
| ((x & 0x00ff0000) >> 8)
| ((x & 0x0000ff00) << 8)
| ((x & 0x000000ff) << 24);
x = ((x & 0xf0f0f0f0) >> 4)
| ((x & 0x0f0f0f0f) << 4);
x = ((x & 0x88888888) >> 3)
| ((x & 0x44444444) >> 1)
| ((x & 0x22222222) << 1)
| ((x & 0x11111111) << 3);
return x;
}
uint32_t HELPER(abs)(uint32_t x)
{
return ((int32_t)x < 0) ? -x : x;
}
#if defined(CONFIG_USER_ONLY)
void do_interrupt (CPUState *env)
{
env->exception_index = -1;
}
/* Structure used to record exclusive memory locations. */
typedef struct mmon_state {
struct mmon_state *next;
CPUARMState *cpu_env;
uint32_t addr;
} mmon_state;
/* Chain of current locks. */
static mmon_state* mmon_head = NULL;
int cpu_arm_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
if (rw == 2) {
env->exception_index = EXCP_PREFETCH_ABORT;
env->cp15.c6_insn = address;
} else {
env->exception_index = EXCP_DATA_ABORT;
env->cp15.c6_data = address;
}
return 1;
}
static void allocate_mmon_state(CPUState *env)
{
env->mmon_entry = malloc(sizeof (mmon_state));
memset (env->mmon_entry, 0, sizeof (mmon_state));
env->mmon_entry->cpu_env = env;
mmon_head = env->mmon_entry;
}
/* Flush any monitor locks for the specified address. */
static void flush_mmon(uint32_t addr)
{
mmon_state *mon;
for (mon = mmon_head; mon; mon = mon->next)
{
if (mon->addr != addr)
continue;
mon->addr = 0;
break;
}
}
/* Mark an address for exclusive access. */
void HELPER(mark_exclusive)(CPUState *env, uint32_t addr)
{
if (!env->mmon_entry)
allocate_mmon_state(env);
/* Clear any previous locks. */
flush_mmon(addr);
env->mmon_entry->addr = addr;
}
/* Test if an exclusive address is still exclusive. Returns zero
if the address is still exclusive. */
uint32_t HELPER(test_exclusive)(CPUState *env, uint32_t addr)
{
int res;
if (!env->mmon_entry)
return 1;
if (env->mmon_entry->addr == addr)
res = 0;
else
res = 1;
flush_mmon(addr);
return res;
}
void HELPER(clrex)(CPUState *env)
{
if (!(env->mmon_entry && env->mmon_entry->addr))
return;
flush_mmon(env->mmon_entry->addr);
}
target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
{
return addr;
}
/* These should probably raise undefined insn exceptions. */
void HELPER(set_cp)(CPUState *env, uint32_t insn, uint32_t val)
{
int op1 = (insn >> 8) & 0xf;
cpu_abort(env, "cp%i insn %08x\n", op1, insn);
return;
}
uint32_t HELPER(get_cp)(CPUState *env, uint32_t insn)
{
int op1 = (insn >> 8) & 0xf;
cpu_abort(env, "cp%i insn %08x\n", op1, insn);
return 0;
}
void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
{
cpu_abort(env, "cp15 insn %08x\n", insn);
}
uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
{
cpu_abort(env, "cp15 insn %08x\n", insn);
return 0;
}
/* These should probably raise undefined insn exceptions. */
void HELPER(v7m_msr)(CPUState *env, uint32_t reg, uint32_t val)
{
cpu_abort(env, "v7m_mrs %d\n", reg);
}
uint32_t HELPER(v7m_mrs)(CPUState *env, uint32_t reg)
{
cpu_abort(env, "v7m_mrs %d\n", reg);
return 0;
}
void switch_mode(CPUState *env, int mode)
{
if (mode != ARM_CPU_MODE_USR)
cpu_abort(env, "Tried to switch out of user mode\n");
}
void HELPER(set_r13_banked)(CPUState *env, uint32_t mode, uint32_t val)
{
cpu_abort(env, "banked r13 write\n");
}
uint32_t HELPER(get_r13_banked)(CPUState *env, uint32_t mode)
{
cpu_abort(env, "banked r13 read\n");
return 0;
}
#else
extern int semihosting_enabled;
/* Map CPU modes onto saved register banks. */
static inline int bank_number (int mode)
{
switch (mode) {
case ARM_CPU_MODE_USR:
case ARM_CPU_MODE_SYS:
return 0;
case ARM_CPU_MODE_SVC:
return 1;
case ARM_CPU_MODE_ABT:
return 2;
case ARM_CPU_MODE_UND:
return 3;
case ARM_CPU_MODE_IRQ:
return 4;
case ARM_CPU_MODE_FIQ:
return 5;
}
cpu_abort(cpu_single_env, "Bad mode %x\n", mode);
return -1;
}
void switch_mode(CPUState *env, int mode)
{
int old_mode;
int i;
old_mode = env->uncached_cpsr & CPSR_M;
if (mode == old_mode)
return;
if (old_mode == ARM_CPU_MODE_FIQ) {
memcpy (env->fiq_regs, env->regs + 8, 5 * sizeof(uint32_t));
memcpy (env->regs + 8, env->usr_regs, 5 * sizeof(uint32_t));
} else if (mode == ARM_CPU_MODE_FIQ) {
memcpy (env->usr_regs, env->regs + 8, 5 * sizeof(uint32_t));
memcpy (env->regs + 8, env->fiq_regs, 5 * sizeof(uint32_t));
}
i = bank_number(old_mode);
env->banked_r13[i] = env->regs[13];
env->banked_r14[i] = env->regs[14];
env->banked_spsr[i] = env->spsr;
i = bank_number(mode);
env->regs[13] = env->banked_r13[i];
env->regs[14] = env->banked_r14[i];
env->spsr = env->banked_spsr[i];
}
static void v7m_push(CPUARMState *env, uint32_t val)
{
env->regs[13] -= 4;
stl_phys(env->regs[13], val);
}
static uint32_t v7m_pop(CPUARMState *env)
{
uint32_t val;
val = ldl_phys(env->regs[13]);
env->regs[13] += 4;
return val;
}
/* Switch to V7M main or process stack pointer. */
static void switch_v7m_sp(CPUARMState *env, int process)
{
uint32_t tmp;
if (env->v7m.current_sp != process) {
tmp = env->v7m.other_sp;
env->v7m.other_sp = env->regs[13];
env->regs[13] = tmp;
env->v7m.current_sp = process;
}
}
static void do_v7m_exception_exit(CPUARMState *env)
{
uint32_t type;
uint32_t xpsr;
type = env->regs[15];
if (env->v7m.exception != 0)
armv7m_nvic_complete_irq(env->v7m.nvic, env->v7m.exception);
/* Switch to the target stack. */
switch_v7m_sp(env, (type & 4) != 0);
/* Pop registers. */
env->regs[0] = v7m_pop(env);
env->regs[1] = v7m_pop(env);
env->regs[2] = v7m_pop(env);
env->regs[3] = v7m_pop(env);
env->regs[12] = v7m_pop(env);
env->regs[14] = v7m_pop(env);
env->regs[15] = v7m_pop(env);
xpsr = v7m_pop(env);
xpsr_write(env, xpsr, 0xfffffdff);
/* Undo stack alignment. */
if (xpsr & 0x200)
env->regs[13] |= 4;
/* ??? The exception return type specifies Thread/Handler mode. However
this is also implied by the xPSR value. Not sure what to do
if there is a mismatch. */
/* ??? Likewise for mismatches between the CONTROL register and the stack
pointer. */
}
static void do_interrupt_v7m(CPUARMState *env)
{
uint32_t xpsr = xpsr_read(env);
uint32_t lr;
uint32_t addr;
lr = 0xfffffff1;
if (env->v7m.current_sp)
lr |= 4;
if (env->v7m.exception == 0)
lr |= 8;
/* For exceptions we just mark as pending on the NVIC, and let that
handle it. */
/* TODO: Need to escalate if the current priority is higher than the
one we're raising. */
switch (env->exception_index) {
case EXCP_UDEF:
armv7m_nvic_set_pending(env->v7m.nvic, ARMV7M_EXCP_USAGE);
return;
case EXCP_SWI:
env->regs[15] += 2;
armv7m_nvic_set_pending(env->v7m.nvic, ARMV7M_EXCP_SVC);
return;
case EXCP_PREFETCH_ABORT:
case EXCP_DATA_ABORT:
armv7m_nvic_set_pending(env->v7m.nvic, ARMV7M_EXCP_MEM);
return;
case EXCP_BKPT:
if (semihosting_enabled) {
int nr;
nr = lduw_code(env->regs[15]) & 0xff;
if (nr == 0xab) {
env->regs[15] += 2;
env->regs[0] = do_arm_semihosting(env);
return;
}
}
armv7m_nvic_set_pending(env->v7m.nvic, ARMV7M_EXCP_DEBUG);
return;
case EXCP_IRQ:
env->v7m.exception = armv7m_nvic_acknowledge_irq(env->v7m.nvic);
break;
case EXCP_EXCEPTION_EXIT:
do_v7m_exception_exit(env);
return;
default:
cpu_abort(env, "Unhandled exception 0x%x\n", env->exception_index);
return; /* Never happens. Keep compiler happy. */
}
/* Align stack pointer. */
/* ??? Should only do this if Configuration Control Register
STACKALIGN bit is set. */
if (env->regs[13] & 4) {
env->regs[13] -= 4;
xpsr |= 0x200;
}
/* Switch to the handler mode. */
v7m_push(env, xpsr);
v7m_push(env, env->regs[15]);
v7m_push(env, env->regs[14]);
v7m_push(env, env->regs[12]);
v7m_push(env, env->regs[3]);
v7m_push(env, env->regs[2]);
v7m_push(env, env->regs[1]);
v7m_push(env, env->regs[0]);
switch_v7m_sp(env, 0);
env->uncached_cpsr &= ~CPSR_IT;
env->regs[14] = lr;
addr = ldl_phys(env->v7m.vecbase + env->v7m.exception * 4);
env->regs[15] = addr & 0xfffffffe;
env->thumb = addr & 1;
}
/* Handle a CPU exception. */
void do_interrupt(CPUARMState *env)
{
uint32_t addr;
uint32_t mask;
int new_mode;
uint32_t offset;
if (IS_M(env)) {
do_interrupt_v7m(env);
return;
}
/* TODO: Vectored interrupt controller. */
switch (env->exception_index) {
case EXCP_UDEF:
new_mode = ARM_CPU_MODE_UND;
addr = 0x04;
mask = CPSR_I;
if (env->thumb)
offset = 2;
else
offset = 4;
break;
case EXCP_SWI:
if (semihosting_enabled) {
/* Check for semihosting interrupt. */
if (env->thumb) {
mask = lduw_code(env->regs[15] - 2) & 0xff;
} else {
mask = ldl_code(env->regs[15] - 4) & 0xffffff;
}
/* Only intercept calls from privileged modes, to provide some
semblance of security. */
if (((mask == 0x123456 && !env->thumb)
|| (mask == 0xab && env->thumb))
&& (env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR) {
env->regs[0] = do_arm_semihosting(env);
return;
}
}
new_mode = ARM_CPU_MODE_SVC;
addr = 0x08;
mask = CPSR_I;
/* The PC already points to the next instruction. */
offset = 0;
break;
case EXCP_BKPT:
/* See if this is a semihosting syscall. */
if (env->thumb && semihosting_enabled) {
mask = lduw_code(env->regs[15]) & 0xff;
if (mask == 0xab
&& (env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR) {
env->regs[15] += 2;
env->regs[0] = do_arm_semihosting(env);
return;
}
}
/* Fall through to prefetch abort. */
case EXCP_PREFETCH_ABORT:
new_mode = ARM_CPU_MODE_ABT;
addr = 0x0c;
mask = CPSR_A | CPSR_I;
offset = 4;
break;
case EXCP_DATA_ABORT:
new_mode = ARM_CPU_MODE_ABT;
addr = 0x10;
mask = CPSR_A | CPSR_I;
offset = 8;
break;
case EXCP_IRQ:
new_mode = ARM_CPU_MODE_IRQ;
addr = 0x18;
/* Disable IRQ and imprecise data aborts. */
mask = CPSR_A | CPSR_I;
offset = 4;
break;
case EXCP_FIQ:
new_mode = ARM_CPU_MODE_FIQ;
addr = 0x1c;
/* Disable FIQ, IRQ and imprecise data aborts. */
mask = CPSR_A | CPSR_I | CPSR_F;
offset = 4;
break;
default:
cpu_abort(env, "Unhandled exception 0x%x\n", env->exception_index);
return; /* Never happens. Keep compiler happy. */
}
/* High vectors. */
if (env->cp15.c1_sys & (1 << 13)) {
addr += 0xffff0000;
}
switch_mode (env, new_mode);
env->spsr = cpsr_read(env);
/* Clear IT bits. */
env->condexec_bits = 0;
/* Switch to the new mode, and switch to Arm mode. */
/* ??? Thumb interrupt handlers not implemented. */
env->uncached_cpsr = (env->uncached_cpsr & ~CPSR_M) | new_mode;
env->uncached_cpsr |= mask;
env->thumb = 0;
env->regs[14] = env->regs[15] + offset;
env->regs[15] = addr;
env->interrupt_request |= CPU_INTERRUPT_EXITTB;
}
/* Check section/page access permissions.
Returns the page protection flags, or zero if the access is not
permitted. */
static inline int check_ap(CPUState *env, int ap, int domain, int access_type,
int is_user)
{
int prot_ro;
if (domain == 3)
return PAGE_READ | PAGE_WRITE;
if (access_type == 1)
prot_ro = 0;
else
prot_ro = PAGE_READ;
switch (ap) {
case 0:
if (access_type == 1)
return 0;
switch ((env->cp15.c1_sys >> 8) & 3) {
case 1:
return is_user ? 0 : PAGE_READ;
case 2:
return PAGE_READ;
default:
return 0;
}
case 1:
return is_user ? 0 : PAGE_READ | PAGE_WRITE;
case 2:
if (is_user)
return prot_ro;
else
return PAGE_READ | PAGE_WRITE;
case 3:
return PAGE_READ | PAGE_WRITE;
case 4: /* Reserved. */
return 0;
case 5:
return is_user ? 0 : prot_ro;
case 6:
return prot_ro;
case 7:
if (!arm_feature (env, ARM_FEATURE_V7))
return 0;
return prot_ro;
default:
abort();
}
}
static uint32_t get_level1_table_address(CPUState *env, uint32_t address)
{
uint32_t table;
if (address & env->cp15.c2_mask)
table = env->cp15.c2_base1 & 0xffffc000;
else
table = env->cp15.c2_base0 & env->cp15.c2_base_mask;
table |= (address >> 18) & 0x3ffc;
return table;
}
static int get_phys_addr_v5(CPUState *env, uint32_t address, int access_type,
int is_user, uint32_t *phys_ptr, int *prot)
{
int code;
uint32_t table;
uint32_t desc;
int type;
int ap;
int domain;
uint32_t phys_addr;
/* Pagetable walk. */
/* Lookup l1 descriptor. */
table = get_level1_table_address(env, address);
desc = ldl_phys(table);
type = (desc & 3);
domain = (env->cp15.c3 >> ((desc >> 4) & 0x1e)) & 3;
if (type == 0) {
/* Section translation fault. */
code = 5;
goto do_fault;
}
if (domain == 0 || domain == 2) {
if (type == 2)
code = 9; /* Section domain fault. */
else
code = 11; /* Page domain fault. */
goto do_fault;
}
if (type == 2) {
/* 1Mb section. */
phys_addr = (desc & 0xfff00000) | (address & 0x000fffff);
ap = (desc >> 10) & 3;
code = 13;
} else {
/* Lookup l2 entry. */
if (type == 1) {
/* Coarse pagetable. */
table = (desc & 0xfffffc00) | ((address >> 10) & 0x3fc);
} else {
/* Fine pagetable. */
table = (desc & 0xfffff000) | ((address >> 8) & 0xffc);
}
desc = ldl_phys(table);
switch (desc & 3) {
case 0: /* Page translation fault. */
code = 7;
goto do_fault;
case 1: /* 64k page. */
phys_addr = (desc & 0xffff0000) | (address & 0xffff);
ap = (desc >> (4 + ((address >> 13) & 6))) & 3;
break;
case 2: /* 4k page. */
phys_addr = (desc & 0xfffff000) | (address & 0xfff);
ap = (desc >> (4 + ((address >> 13) & 6))) & 3;
break;
case 3: /* 1k page. */
if (type == 1) {
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
phys_addr = (desc & 0xfffff000) | (address & 0xfff);
} else {