summaryrefslogtreecommitdiff
path: root/target/alpha/helper.c
diff options
context:
space:
mode:
Diffstat (limited to 'target/alpha/helper.c')
-rw-r--r--target/alpha/helper.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/target/alpha/helper.c b/target/alpha/helper.c
new file mode 100644
index 0000000000..a5c308859b
--- /dev/null
+++ b/target/alpha/helper.c
@@ -0,0 +1,490 @@
+/*
+ * 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 "qemu/osdep.h"
+
+#include "cpu.h"
+#include "exec/exec-all.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;
+
+ /* Handle physical accesses. */
+ if (mmu_idx == MMU_PHYS_IDX) {
+ phys = addr;
+ prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+ ret = -1;
+ goto exit;
+ }
+
+ /* 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;
+ }
+ qemu_log("INT %6d: %s(%#x) cpu=%d pc=%016"
+ PRIx64 " sp=%016" PRIx64 "\n",
+ ++count, name, env->error_code, cs->cpu_index,
+ 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 07:24:15 +0000