tcg/arm: Support split-wx code generation

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/arm/tcg-target.c.inc

@@ -187,29 +187,32 @@ static const uint8_t tcg_cond_to_arm_cond[] = {
     [TCG_COND_GTU] = COND_HI,
 };
 
-static inline bool reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
+static bool reloc_pc24(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = (tcg_ptr_byte_diff(target, code_ptr) - 8) >> 2;
+    const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
+    ptrdiff_t offset = (tcg_ptr_byte_diff(target, src_rx) - 8) >> 2;
+
     if (offset == sextract32(offset, 0, 24)) {
-        *code_ptr = (*code_ptr & ~0xffffff) | (offset & 0xffffff);
+        *src_rw = deposit32(*src_rw, 0, 24, offset);
         return true;
     }
     return false;
 }
 
-static inline bool reloc_pc13(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
+static bool reloc_pc13(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = tcg_ptr_byte_diff(target, code_ptr) - 8;
+    const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
+    ptrdiff_t offset = tcg_ptr_byte_diff(target, src_rx) - 8;
 
     if (offset >= -0xfff && offset <= 0xfff) {
-        tcg_insn_unit insn = *code_ptr;
+        tcg_insn_unit insn = *src_rw;
         bool u = (offset >= 0);
         if (!u) {
             offset = -offset;
         }
         insn = deposit32(insn, 23, 1, u);
         insn = deposit32(insn, 0, 12, offset);
-        *code_ptr = insn;
+        *src_rw = insn;
         return true;
     }
     return false;
@@ -221,9 +224,9 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
     tcg_debug_assert(addend == 0);
 
     if (type == R_ARM_PC24) {
-        return reloc_pc24(code_ptr, (tcg_insn_unit *)value);
+        return reloc_pc24(code_ptr, (const tcg_insn_unit *)value);
     } else if (type == R_ARM_PC13) {
-        return reloc_pc13(code_ptr, (tcg_insn_unit *)value);
+        return reloc_pc13(code_ptr, (const tcg_insn_unit *)value);
     } else {
         g_assert_not_reached();
     }
@@ -617,7 +620,7 @@ static void tcg_out_movi32(TCGContext *s, int cond, int rd, uint32_t arg)
 
     /* Check for a pc-relative address.  This will usually be the TB,
        or within the TB, which is immediately before the code block.  */
-    diff = arg - ((intptr_t)s->code_ptr + 8);
+    diff = tcg_pcrel_diff(s, (void *)arg) - 8;
     if (diff >= 0) {
         rot = encode_imm(diff);
         if (rot >= 0) {
@@ -1337,7 +1340,8 @@ static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOpIdx oi,
     label->datahi_reg = datahi;
     label->addrlo_reg = addrlo;
     label->addrhi_reg = addrhi;
-    label->raddr = raddr;
+    /* TODO: Cast goes away when all hosts converted */
+    label->raddr = (void *)tcg_splitwx_to_rx(raddr);
     label->label_ptr[0] = label_ptr;
 }
 
@@ -1348,7 +1352,7 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     MemOp opc = get_memop(oi);
     void *func;
 
-    if (!reloc_pc24(lb->label_ptr[0], s->code_ptr)) {
+    if (!reloc_pc24(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
@@ -1411,7 +1415,7 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     TCGMemOpIdx oi = lb->oi;
     MemOp opc = get_memop(oi);
 
-    if (!reloc_pc24(lb->label_ptr[0], s->code_ptr)) {
+    if (!reloc_pc24(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
@@ -1762,8 +1766,8 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
             TCGReg base = TCG_REG_PC;
 
             tcg_debug_assert(s->tb_jmp_insn_offset == 0);
-            ptr = (intptr_t)(s->tb_jmp_target_addr + args[0]);
-            dif = ptr - ((intptr_t)s->code_ptr + 8);
+            ptr = (intptr_t)tcg_splitwx_to_rx(s->tb_jmp_target_addr + args[0]);
+            dif = tcg_pcrel_diff(s, (void *)ptr) - 8;
             dil = sextract32(dif, 0, 12);
             if (dif != dil) {
                 /* The TB is close, but outside the 12 bits addressable by
@@ -2297,7 +2301,8 @@ static void tcg_target_qemu_prologue(TCGContext *s)
      * Return path for goto_ptr. Set return value to 0, a-la exit_tb,
      * and fall through to the rest of the epilogue.
      */
-    tcg_code_gen_epilogue = s->code_ptr;
+    /* TODO: Cast goes away when all hosts converted */
+    tcg_code_gen_epilogue = (void *)tcg_splitwx_to_rx(s->code_ptr);
     tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, 0);
     tcg_out_epilogue(s);
 }

tcg/arm/tcg-target.h

@@ -142,6 +142,6 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
 #define TCG_TARGET_NEED_LDST_LABELS
 #endif
 #define TCG_TARGET_NEED_POOL_LABELS
-#define TCG_TARGET_SUPPORT_MIRROR       0
+#define TCG_TARGET_SUPPORT_MIRROR       1
 
 #endif