arm support - suppressed possibly unsafe sparc nop deletion
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@225 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/dyngen.h b/dyngen.h
new file mode 100644
index 0000000..cafa4f5
--- /dev/null
+++ b/dyngen.h
@@ -0,0 +1,122 @@
+/*
+ * dyngen helpers
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef __alpha__
+
+register int gp asm("$29");
+
+static inline void immediate_ldah(void *p, int val) {
+ uint32_t *dest = p;
+ long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;
+
+ *dest &= ~0xffff;
+ *dest |= high;
+ *dest |= 31 << 16;
+}
+static inline void immediate_lda(void *dest, int val) {
+ *(uint16_t *) dest = val;
+}
+void fix_bsr(void *p, int offset) {
+ uint32_t *dest = p;
+ *dest &= ~((1 << 21) - 1);
+ *dest |= (offset >> 2) & ((1 << 21) - 1);
+}
+
+#endif /* __alpha__ */
+
+#ifdef __arm__
+
+#define MAX_OP_SIZE (128 * 4) /* in bytes */
+/* max size of the code that can be generated without calling arm_flush_ldr */
+#define MAX_FRAG_SIZE (1024 * 4)
+//#define MAX_FRAG_SIZE (135 * 4) /* for testing */
+
+typedef struct LDREntry {
+ uint8_t *ptr;
+ uint32_t *data_ptr;
+} LDREntry;
+
+static LDREntry arm_ldr_table[1024];
+static uint32_t arm_data_table[1024];
+
+extern char exec_loop;
+
+static inline void arm_reloc_pc24(uint32_t *ptr, uint32_t insn, int val)
+{
+ *ptr = (insn & ~0xffffff) | ((insn + ((val - (int)ptr) >> 2)) & 0xffffff);
+}
+
+static uint8_t *arm_flush_ldr(uint8_t *gen_code_ptr,
+ LDREntry *ldr_start, LDREntry *ldr_end,
+ uint32_t *data_start, uint32_t *data_end,
+ int gen_jmp)
+{
+ LDREntry *le;
+ uint32_t *ptr;
+ int offset, data_size, target;
+ uint8_t *data_ptr;
+ uint32_t insn;
+
+ data_size = (uint8_t *)data_end - (uint8_t *)data_start;
+
+ if (!gen_jmp) {
+ /* b exec_loop */
+ arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, (long)(&exec_loop));
+ gen_code_ptr += 4;
+ } else {
+ /* generate branch to skip the data */
+ if (data_size == 0)
+ return gen_code_ptr;
+ target = (long)gen_code_ptr + data_size + 4;
+ arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, target);
+ gen_code_ptr += 4;
+ }
+
+ /* copy the data */
+ data_ptr = gen_code_ptr;
+ memcpy(gen_code_ptr, data_start, data_size);
+ gen_code_ptr += data_size;
+
+ /* patch the ldr to point to the data */
+ for(le = ldr_start; le < ldr_end; le++) {
+ ptr = (uint32_t *)le->ptr;
+ offset = ((unsigned long)(le->data_ptr) - (unsigned long)data_start) +
+ (unsigned long)data_ptr -
+ (unsigned long)ptr - 8;
+ insn = *ptr & ~(0xfff | 0x00800000);
+ if (offset < 0) {
+ offset = - offset;
+ } else {
+ insn |= 0x00800000;
+ }
+ if (offset > 0xfff) {
+ fprintf(stderr, "Error ldr offset\n");
+ abort();
+ }
+ insn |= offset;
+ *ptr = insn;
+ }
+ return gen_code_ptr;
+}
+
+#endif /* __arm__ */
+
+
+
