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-rw-r--r--target/xtensa/win_helper.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/target/xtensa/win_helper.c b/target/xtensa/win_helper.c
new file mode 100644
index 0000000000..ec9ff44db0
--- /dev/null
+++ b/target/xtensa/win_helper.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2011 - 2019, Max Filippov, Open Source and Linux Lab.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of the Open Source and Linux Lab nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "qemu/host-utils.h"
+#include "exec/exec-all.h"
+
+static void copy_window_from_phys(CPUXtensaState *env,
+ uint32_t window, uint32_t phys, uint32_t n)
+{
+ assert(phys < env->config->nareg);
+ if (phys + n <= env->config->nareg) {
+ memcpy(env->regs + window, env->phys_regs + phys,
+ n * sizeof(uint32_t));
+ } else {
+ uint32_t n1 = env->config->nareg - phys;
+ memcpy(env->regs + window, env->phys_regs + phys,
+ n1 * sizeof(uint32_t));
+ memcpy(env->regs + window + n1, env->phys_regs,
+ (n - n1) * sizeof(uint32_t));
+ }
+}
+
+static void copy_phys_from_window(CPUXtensaState *env,
+ uint32_t phys, uint32_t window, uint32_t n)
+{
+ assert(phys < env->config->nareg);
+ if (phys + n <= env->config->nareg) {
+ memcpy(env->phys_regs + phys, env->regs + window,
+ n * sizeof(uint32_t));
+ } else {
+ uint32_t n1 = env->config->nareg - phys;
+ memcpy(env->phys_regs + phys, env->regs + window,
+ n1 * sizeof(uint32_t));
+ memcpy(env->phys_regs, env->regs + window + n1,
+ (n - n1) * sizeof(uint32_t));
+ }
+}
+
+static inline unsigned windowbase_bound(unsigned a, const CPUXtensaState *env)
+{
+ return a & (env->config->nareg / 4 - 1);
+}
+
+static inline unsigned windowstart_bit(unsigned a, const CPUXtensaState *env)
+{
+ return 1 << windowbase_bound(a, env);
+}
+
+void xtensa_sync_window_from_phys(CPUXtensaState *env)
+{
+ copy_window_from_phys(env, 0, env->sregs[WINDOW_BASE] * 4, 16);
+}
+
+void xtensa_sync_phys_from_window(CPUXtensaState *env)
+{
+ copy_phys_from_window(env, env->sregs[WINDOW_BASE] * 4, 0, 16);
+}
+
+static void xtensa_rotate_window_abs(CPUXtensaState *env, uint32_t position)
+{
+ xtensa_sync_phys_from_window(env);
+ env->sregs[WINDOW_BASE] = windowbase_bound(position, env);
+ xtensa_sync_window_from_phys(env);
+}
+
+void xtensa_rotate_window(CPUXtensaState *env, uint32_t delta)
+{
+ xtensa_rotate_window_abs(env, env->sregs[WINDOW_BASE] + delta);
+}
+
+void HELPER(sync_windowbase)(CPUXtensaState *env)
+{
+ xtensa_rotate_window_abs(env, env->windowbase_next);
+}
+
+void HELPER(entry)(CPUXtensaState *env, uint32_t pc, uint32_t s, uint32_t imm)
+{
+ int callinc = (env->sregs[PS] & PS_CALLINC) >> PS_CALLINC_SHIFT;
+
+ env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - imm;
+ env->windowbase_next = env->sregs[WINDOW_BASE] + callinc;
+ env->sregs[WINDOW_START] |= windowstart_bit(env->windowbase_next, env);
+}
+
+void HELPER(window_check)(CPUXtensaState *env, uint32_t pc, uint32_t w)
+{
+ uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
+ uint32_t windowstart = xtensa_replicate_windowstart(env) >>
+ (env->sregs[WINDOW_BASE] + 1);
+ uint32_t n = ctz32(windowstart) + 1;
+
+ assert(n <= w);
+
+ xtensa_rotate_window(env, n);
+ env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
+ (windowbase << PS_OWB_SHIFT) | PS_EXCM;
+ env->sregs[EPC1] = env->pc = pc;
+
+ switch (ctz32(windowstart >> n)) {
+ case 0:
+ HELPER(exception)(env, EXC_WINDOW_OVERFLOW4);
+ break;
+ case 1:
+ HELPER(exception)(env, EXC_WINDOW_OVERFLOW8);
+ break;
+ default:
+ HELPER(exception)(env, EXC_WINDOW_OVERFLOW12);
+ break;
+ }
+}
+
+void HELPER(test_ill_retw)(CPUXtensaState *env, uint32_t pc)
+{
+ int n = (env->regs[0] >> 30) & 0x3;
+ int m = 0;
+ uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
+ uint32_t windowstart = env->sregs[WINDOW_START];
+
+ if (windowstart & windowstart_bit(windowbase - 1, env)) {
+ m = 1;
+ } else if (windowstart & windowstart_bit(windowbase - 2, env)) {
+ m = 2;
+ } else if (windowstart & windowstart_bit(windowbase - 3, env)) {
+ m = 3;
+ }
+
+ if (n == 0 || (m != 0 && m != n)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "Illegal retw instruction(pc = %08x), "
+ "PS = %08x, m = %d, n = %d\n",
+ pc, env->sregs[PS], m, n);
+ HELPER(exception_cause)(env, pc, ILLEGAL_INSTRUCTION_CAUSE);
+ }
+}
+
+void HELPER(test_underflow_retw)(CPUXtensaState *env, uint32_t pc)
+{
+ int n = (env->regs[0] >> 30) & 0x3;
+
+ if (!(env->sregs[WINDOW_START] &
+ windowstart_bit(env->sregs[WINDOW_BASE] - n, env))) {
+ uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
+
+ xtensa_rotate_window(env, -n);
+ /* window underflow */
+ env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
+ (windowbase << PS_OWB_SHIFT) | PS_EXCM;
+ env->sregs[EPC1] = env->pc = pc;
+
+ if (n == 1) {
+ HELPER(exception)(env, EXC_WINDOW_UNDERFLOW4);
+ } else if (n == 2) {
+ HELPER(exception)(env, EXC_WINDOW_UNDERFLOW8);
+ } else if (n == 3) {
+ HELPER(exception)(env, EXC_WINDOW_UNDERFLOW12);
+ }
+ }
+}
+
+void HELPER(retw)(CPUXtensaState *env, uint32_t a0)
+{
+ int n = (a0 >> 30) & 0x3;
+
+ xtensa_rotate_window(env, -n);
+}
+
+void xtensa_restore_owb(CPUXtensaState *env)
+{
+ xtensa_rotate_window_abs(env, (env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);
+}
+
+void HELPER(restore_owb)(CPUXtensaState *env)
+{
+ xtensa_restore_owb(env);
+}
+
+void HELPER(movsp)(CPUXtensaState *env, uint32_t pc)
+{
+ if ((env->sregs[WINDOW_START] &
+ (windowstart_bit(env->sregs[WINDOW_BASE] - 3, env) |
+ windowstart_bit(env->sregs[WINDOW_BASE] - 2, env) |
+ windowstart_bit(env->sregs[WINDOW_BASE] - 1, env))) == 0) {
+ HELPER(exception_cause)(env, pc, ALLOCA_CAUSE);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 23:07:15 +0000