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qemu-e2k/target-alpha/helper.c
Richard Henderson 591243846f target-alpha: Use separate TCGv temporaries for the shadow registers 
This avoids having to manually swap them around when swapping to and
from PALmode.  We simply encode the shadow registers into the translation.

The VMStateDescription version changes, because the meaning of "shadow"
changes in the save file when in PALmode.  It would be possible to fix
this, but I don't think it's worth the effort.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
2015-08-18 11:08:48 -07:00

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/*
* Alpha emulation cpu helpers for qemu.
*
* Copyright (c) 2007 Jocelyn Mayer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "cpu.h"
#include "fpu/softfloat.h"
#include "exec/helper-proto.h"
#define CONVERT_BIT(X, SRC, DST) \
(SRC > DST ? (X) / (SRC / DST) & (DST) : ((X) & SRC) * (DST / SRC))
uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env)
{
return (uint64_t)env->fpcr << 32;
}
void cpu_alpha_store_fpcr (CPUAlphaState *env, uint64_t val)
{
uint32_t fpcr = val >> 32;
uint32_t t = 0;
t |= CONVERT_BIT(fpcr, FPCR_INED, FPCR_INE);
t |= CONVERT_BIT(fpcr, FPCR_UNFD, FPCR_UNF);
t |= CONVERT_BIT(fpcr, FPCR_OVFD, FPCR_OVF);
t |= CONVERT_BIT(fpcr, FPCR_DZED, FPCR_DZE);
t |= CONVERT_BIT(fpcr, FPCR_INVD, FPCR_INV);
env->fpcr = fpcr;
env->fpcr_exc_enable = ~t & FPCR_STATUS_MASK;
switch (fpcr & FPCR_DYN_MASK) {
case FPCR_DYN_NORMAL:
default:
t = float_round_nearest_even;
break;
case FPCR_DYN_CHOPPED:
t = float_round_to_zero;
break;
case FPCR_DYN_MINUS:
t = float_round_down;
break;
case FPCR_DYN_PLUS:
t = float_round_up;
break;
}
env->fpcr_dyn_round = t;
env->fpcr_flush_to_zero = (fpcr & FPCR_UNFD) && (fpcr & FPCR_UNDZ);
env->fp_status.flush_inputs_to_zero = (fpcr & FPCR_DNZ) != 0;
}
uint64_t helper_load_fpcr(CPUAlphaState *env)
{
return cpu_alpha_load_fpcr(env);
}
void helper_store_fpcr(CPUAlphaState *env, uint64_t val)
{
cpu_alpha_store_fpcr(env, val);
}
static uint64_t *cpu_alpha_addr_gr(CPUAlphaState *env, unsigned reg)
{
#ifndef CONFIG_USER_ONLY
if (env->pal_mode) {
if (reg >= 8 && reg <= 14) {
return &env->shadow[reg - 8];
} else if (reg == 25) {
return &env->shadow[7];
}
}
#endif
return &env->ir[reg];
}
uint64_t cpu_alpha_load_gr(CPUAlphaState *env, unsigned reg)
{
return *cpu_alpha_addr_gr(env, reg);
}
void cpu_alpha_store_gr(CPUAlphaState *env, unsigned reg, uint64_t val)
{
*cpu_alpha_addr_gr(env, reg) = val;
}
#if defined(CONFIG_USER_ONLY)
int alpha_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
int rw, int mmu_idx)
{
AlphaCPU *cpu = ALPHA_CPU(cs);
cs->exception_index = EXCP_MMFAULT;
cpu->env.trap_arg0 = address;
return 1;
}
#else
/* Returns the OSF/1 entMM failure indication, or -1 on success. */
static int get_physical_address(CPUAlphaState *env, target_ulong addr,
int prot_need, int mmu_idx,
target_ulong *pphys, int *pprot)
{
CPUState *cs = CPU(alpha_env_get_cpu(env));
target_long saddr = addr;
target_ulong phys = 0;
target_ulong L1pte, L2pte, L3pte;
target_ulong pt, index;
int prot = 0;
int ret = MM_K_ACV;
/* Ensure that the virtual address is properly sign-extended from
the last implemented virtual address bit. */
if (saddr >> TARGET_VIRT_ADDR_SPACE_BITS != saddr >> 63) {
goto exit;
}
/* Translate the superpage. */
/* ??? When we do more than emulate Unix PALcode, we'll need to
determine which KSEG is actually active. */
if (saddr < 0 && ((saddr >> 41) & 3) == 2) {
/* User-space cannot access KSEG addresses. */
if (mmu_idx != MMU_KERNEL_IDX) {
goto exit;
}
/* For the benefit of the Typhoon chipset, move bit 40 to bit 43.
We would not do this if the 48-bit KSEG is enabled. */
phys = saddr & ((1ull << 40) - 1);
phys |= (saddr & (1ull << 40)) << 3;
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
ret = -1;
goto exit;
}
/* Interpret the page table exactly like PALcode does. */
pt = env->ptbr;
/* L1 page table read. */
index = (addr >> (TARGET_PAGE_BITS + 20)) & 0x3ff;
L1pte = ldq_phys(cs->as, pt + index*8);
if (unlikely((L1pte & PTE_VALID) == 0)) {
ret = MM_K_TNV;
goto exit;
}
if (unlikely((L1pte & PTE_KRE) == 0)) {
goto exit;
}
pt = L1pte >> 32 << TARGET_PAGE_BITS;
/* L2 page table read. */
index = (addr >> (TARGET_PAGE_BITS + 10)) & 0x3ff;
L2pte = ldq_phys(cs->as, pt + index*8);
if (unlikely((L2pte & PTE_VALID) == 0)) {
ret = MM_K_TNV;
goto exit;
}
if (unlikely((L2pte & PTE_KRE) == 0)) {
goto exit;
}
pt = L2pte >> 32 << TARGET_PAGE_BITS;
/* L3 page table read. */
index = (addr >> TARGET_PAGE_BITS) & 0x3ff;
L3pte = ldq_phys(cs->as, pt + index*8);
phys = L3pte >> 32 << TARGET_PAGE_BITS;
if (unlikely((L3pte & PTE_VALID) == 0)) {
ret = MM_K_TNV;
goto exit;
}
#if PAGE_READ != 1 || PAGE_WRITE != 2 || PAGE_EXEC != 4
# error page bits out of date
#endif
/* Check access violations. */
if (L3pte & (PTE_KRE << mmu_idx)) {
prot |= PAGE_READ | PAGE_EXEC;
}
if (L3pte & (PTE_KWE << mmu_idx)) {
prot |= PAGE_WRITE;
}
if (unlikely((prot & prot_need) == 0 && prot_need)) {
goto exit;
}
/* Check fault-on-operation violations. */
prot &= ~(L3pte >> 1);
ret = -1;
if (unlikely((prot & prot_need) == 0)) {
ret = (prot_need & PAGE_EXEC ? MM_K_FOE :
prot_need & PAGE_WRITE ? MM_K_FOW :
prot_need & PAGE_READ ? MM_K_FOR : -1);
}
exit:
*pphys = phys;
*pprot = prot;
return ret;
}
hwaddr alpha_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
AlphaCPU *cpu = ALPHA_CPU(cs);
target_ulong phys;
int prot, fail;
fail = get_physical_address(&cpu->env, addr, 0, 0, &phys, &prot);
return (fail >= 0 ? -1 : phys);
}
int alpha_cpu_handle_mmu_fault(CPUState *cs, vaddr addr, int rw,
int mmu_idx)
{
AlphaCPU *cpu = ALPHA_CPU(cs);
CPUAlphaState *env = &cpu->env;
target_ulong phys;
int prot, fail;
fail = get_physical_address(env, addr, 1 << rw, mmu_idx, &phys, &prot);
if (unlikely(fail >= 0)) {
cs->exception_index = EXCP_MMFAULT;
env->trap_arg0 = addr;
env->trap_arg1 = fail;
env->trap_arg2 = (rw == 2 ? -1 : rw);
return 1;
}
tlb_set_page(cs, addr & TARGET_PAGE_MASK, phys & TARGET_PAGE_MASK,
prot, mmu_idx, TARGET_PAGE_SIZE);
return 0;
}
#endif /* USER_ONLY */
void alpha_cpu_do_interrupt(CPUState *cs)
{
AlphaCPU *cpu = ALPHA_CPU(cs);
CPUAlphaState *env = &cpu->env;
int i = cs->exception_index;
if (qemu_loglevel_mask(CPU_LOG_INT)) {
static int count;
const char *name = "<unknown>";
switch (i) {
case EXCP_RESET:
name = "reset";
break;
case EXCP_MCHK:
name = "mchk";
break;
case EXCP_SMP_INTERRUPT:
name = "smp_interrupt";
break;
case EXCP_CLK_INTERRUPT:
name = "clk_interrupt";
break;
case EXCP_DEV_INTERRUPT:
name = "dev_interrupt";
break;
case EXCP_MMFAULT:
name = "mmfault";
break;
case EXCP_UNALIGN:
name = "unalign";
break;
case EXCP_OPCDEC:
name = "opcdec";
break;
case EXCP_ARITH:
name = "arith";
break;
case EXCP_FEN:
name = "fen";
break;
case EXCP_CALL_PAL:
name = "call_pal";
break;
case EXCP_STL_C:
name = "stl_c";
break;
case EXCP_STQ_C:
name = "stq_c";
break;
}
qemu_log("INT %6d: %s(%#x) pc=%016" PRIx64 " sp=%016" PRIx64 "\n",
++count, name, env->error_code, env->pc, env->ir[IR_SP]);
}
cs->exception_index = -1;
#if !defined(CONFIG_USER_ONLY)
switch (i) {
case EXCP_RESET:
i = 0x0000;
break;
case EXCP_MCHK:
i = 0x0080;
break;
case EXCP_SMP_INTERRUPT:
i = 0x0100;
break;
case EXCP_CLK_INTERRUPT:
i = 0x0180;
break;
case EXCP_DEV_INTERRUPT:
i = 0x0200;
break;
case EXCP_MMFAULT:
i = 0x0280;
break;
case EXCP_UNALIGN:
i = 0x0300;
break;
case EXCP_OPCDEC:
i = 0x0380;
break;
case EXCP_ARITH:
i = 0x0400;
break;
case EXCP_FEN:
i = 0x0480;
break;
case EXCP_CALL_PAL:
i = env->error_code;
/* There are 64 entry points for both privileged and unprivileged,
with bit 0x80 indicating unprivileged. Each entry point gets
64 bytes to do its job. */
if (i & 0x80) {
i = 0x2000 + (i - 0x80) * 64;
} else {
i = 0x1000 + i * 64;
}
break;
default:
cpu_abort(cs, "Unhandled CPU exception");
}
/* Remember where the exception happened. Emulate real hardware in
that the low bit of the PC indicates PALmode. */
env->exc_addr = env->pc | env->pal_mode;
/* Continue execution at the PALcode entry point. */
env->pc = env->palbr + i;
/* Switch to PALmode. */
env->pal_mode = 1;
#endif /* !USER_ONLY */
}
bool alpha_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
AlphaCPU *cpu = ALPHA_CPU(cs);
CPUAlphaState *env = &cpu->env;
int idx = -1;
/* We never take interrupts while in PALmode. */
if (env->pal_mode) {
return false;
}
/* Fall through the switch, collecting the highest priority
interrupt that isn't masked by the processor status IPL. */
/* ??? This hard-codes the OSF/1 interrupt levels. */
switch (env->ps & PS_INT_MASK) {
case 0 ... 3:
if (interrupt_request & CPU_INTERRUPT_HARD) {
idx = EXCP_DEV_INTERRUPT;
}
/* FALLTHRU */
case 4:
if (interrupt_request & CPU_INTERRUPT_TIMER) {
idx = EXCP_CLK_INTERRUPT;
}
/* FALLTHRU */
case 5:
if (interrupt_request & CPU_INTERRUPT_SMP) {
idx = EXCP_SMP_INTERRUPT;
}
/* FALLTHRU */
case 6:
if (interrupt_request & CPU_INTERRUPT_MCHK) {
idx = EXCP_MCHK;
}
}
if (idx >= 0) {
cs->exception_index = idx;
env->error_code = 0;
alpha_cpu_do_interrupt(cs);
return true;
}
return false;
}
void alpha_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function cpu_fprintf,
int flags)
{
static const char *linux_reg_names[] = {
"v0 ", "t0 ", "t1 ", "t2 ", "t3 ", "t4 ", "t5 ", "t6 ",
"t7 ", "s0 ", "s1 ", "s2 ", "s3 ", "s4 ", "s5 ", "fp ",
"a0 ", "a1 ", "a2 ", "a3 ", "a4 ", "a5 ", "t8 ", "t9 ",
"t10", "t11", "ra ", "t12", "at ", "gp ", "sp ", "zero",
};
AlphaCPU *cpu = ALPHA_CPU(cs);
CPUAlphaState *env = &cpu->env;
int i;
cpu_fprintf(f, " PC " TARGET_FMT_lx " PS %02x\n",
env->pc, env->ps);
for (i = 0; i < 31; i++) {
cpu_fprintf(f, "IR%02d %s " TARGET_FMT_lx " ", i,
linux_reg_names[i], cpu_alpha_load_gr(env, i));
if ((i % 3) == 2)
cpu_fprintf(f, "\n");
}
cpu_fprintf(f, "lock_a " TARGET_FMT_lx " lock_v " TARGET_FMT_lx "\n",
env->lock_addr, env->lock_value);
for (i = 0; i < 31; i++) {
cpu_fprintf(f, "FIR%02d " TARGET_FMT_lx " ", i,
*((uint64_t *)(&env->fir[i])));
if ((i % 3) == 2)
cpu_fprintf(f, "\n");
}
cpu_fprintf(f, "\n");
}
/* This should only be called from translate, via gen_excp.
We expect that ENV->PC has already been updated. */
void QEMU_NORETURN helper_excp(CPUAlphaState *env, int excp, int error)
{
AlphaCPU *cpu = alpha_env_get_cpu(env);
CPUState *cs = CPU(cpu);
cs->exception_index = excp;
env->error_code = error;
cpu_loop_exit(cs);
}
/* This may be called from any of the helpers to set up EXCEPTION_INDEX. */
void QEMU_NORETURN dynamic_excp(CPUAlphaState *env, uintptr_t retaddr,
int excp, int error)
{
AlphaCPU *cpu = alpha_env_get_cpu(env);
CPUState *cs = CPU(cpu);
cs->exception_index = excp;
env->error_code = error;
if (retaddr) {
cpu_restore_state(cs, retaddr);
/* Floating-point exceptions (our only users) point to the next PC. */
env->pc += 4;
}
cpu_loop_exit(cs);
}
void QEMU_NORETURN arith_excp(CPUAlphaState *env, uintptr_t retaddr,
int exc, uint64_t mask)
{
env->trap_arg0 = exc;
env->trap_arg1 = mask;
dynamic_excp(env, retaddr, EXCP_ARITH, 0);
}
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