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[PATCH v3 21/41] tcg/aarch64: Support split-wx code generation


From: Richard Henderson
Subject: [PATCH v3 21/41] tcg/aarch64: Support split-wx code generation
Date: Thu, 5 Nov 2020 19:29:01 -0800

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/aarch64/tcg-target.h     |  2 +-
 tcg/aarch64/tcg-target.c.inc | 57 ++++++++++++++++++++----------------
 2 files changed, 33 insertions(+), 26 deletions(-)

diff --git a/tcg/aarch64/tcg-target.h b/tcg/aarch64/tcg-target.h
index e62d38ba55..abb94f9458 100644
--- a/tcg/aarch64/tcg-target.h
+++ b/tcg/aarch64/tcg-target.h
@@ -155,6 +155,6 @@ 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 /* AARCH64_TCG_TARGET_H */
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 8aa1fafd91..e398913c0c 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -78,38 +78,42 @@ static const int tcg_target_call_oarg_regs[1] = {
 #define TCG_REG_GUEST_BASE TCG_REG_X28
 #endif
 
-static inline bool reloc_pc26(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
+static bool reloc_pc26(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = target - code_ptr;
+    const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
+    ptrdiff_t offset = target - src_rx;
+
     if (offset == sextract64(offset, 0, 26)) {
         /* read instruction, mask away previous PC_REL26 parameter contents,
            set the proper offset, then write back the instruction. */
-        *code_ptr = deposit32(*code_ptr, 0, 26, offset);
+        *src_rw = deposit32(*src_rw, 0, 26, offset);
         return true;
     }
     return false;
 }
 
-static inline bool reloc_pc19(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
+static bool reloc_pc19(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = target - code_ptr;
+    const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
+    ptrdiff_t offset = target - src_rx;
+
     if (offset == sextract64(offset, 0, 19)) {
-        *code_ptr = deposit32(*code_ptr, 5, 19, offset);
+        *src_rw = deposit32(*src_rw, 5, 19, offset);
         return true;
     }
     return false;
 }
 
-static inline bool patch_reloc(tcg_insn_unit *code_ptr, int type,
-                               intptr_t value, intptr_t addend)
+static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
+                        intptr_t value, intptr_t addend)
 {
     tcg_debug_assert(addend == 0);
     switch (type) {
     case R_AARCH64_JUMP26:
     case R_AARCH64_CALL26:
-        return reloc_pc26(code_ptr, (tcg_insn_unit *)value);
+        return reloc_pc26(code_ptr, (const tcg_insn_unit *)value);
     case R_AARCH64_CONDBR19:
-        return reloc_pc19(code_ptr, (tcg_insn_unit *)value);
+        return reloc_pc19(code_ptr, (const tcg_insn_unit *)value);
     default:
         g_assert_not_reached();
     }
@@ -1050,12 +1054,13 @@ static void tcg_out_movi(TCGContext *s, TCGType type, 
TCGReg rd,
     /* Look for host pointer values within 4G of the PC.  This happens
        often when loading pointers to QEMU's own data structures.  */
     if (type == TCG_TYPE_I64) {
-        tcg_target_long disp = value - (intptr_t)s->code_ptr;
+        intptr_t src_rx = (intptr_t)tcg_splitwx_to_rx(s->code_ptr);
+        tcg_target_long disp = value - src_rx;
         if (disp == sextract64(disp, 0, 21)) {
             tcg_out_insn(s, 3406, ADR, rd, disp);
             return;
         }
-        disp = (value >> 12) - ((intptr_t)s->code_ptr >> 12);
+        disp = (value >> 12) - (src_rx >> 12);
         if (disp == sextract64(disp, 0, 21)) {
             tcg_out_insn(s, 3406, ADRP, rd, disp);
             if (value & 0xfff) {
@@ -1308,14 +1313,14 @@ static void tcg_out_cmp(TCGContext *s, TCGType ext, 
TCGReg a,
 
 static void tcg_out_goto(TCGContext *s, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = target - s->code_ptr;
+    ptrdiff_t offset = tcg_pcrel_diff(s, target) >> 2;
     tcg_debug_assert(offset == sextract64(offset, 0, 26));
     tcg_out_insn(s, 3206, B, offset);
 }
 
-static inline void tcg_out_goto_long(TCGContext *s, tcg_insn_unit *target)
+static void tcg_out_goto_long(TCGContext *s, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = target - s->code_ptr;
+    ptrdiff_t offset = tcg_pcrel_diff(s, target) >> 2;
     if (offset == sextract64(offset, 0, 26)) {
         tcg_out_insn(s, 3206, B, offset);
     } else {
@@ -1329,9 +1334,9 @@ static inline void tcg_out_callr(TCGContext *s, TCGReg 
reg)
     tcg_out_insn(s, 3207, BLR, reg);
 }
 
-static inline void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
+static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target)
 {
-    ptrdiff_t offset = target - s->code_ptr;
+    ptrdiff_t offset = tcg_pcrel_diff(s, target) >> 2;
     if (offset == sextract64(offset, 0, 26)) {
         tcg_out_insn(s, 3206, BL, offset);
     } else {
@@ -1393,7 +1398,7 @@ static void tcg_out_brcond(TCGContext *s, TCGType ext, 
TCGCond c, TCGArg a,
         tcg_out_reloc(s, s->code_ptr, R_AARCH64_CONDBR19, l, 0);
         offset = tcg_in32(s) >> 5;
     } else {
-        offset = l->u.value_ptr - s->code_ptr;
+        offset = tcg_pcrel_diff(s, l->u.value_ptr) >> 2;
         tcg_debug_assert(offset == sextract64(offset, 0, 19));
     }
 
@@ -1568,7 +1573,7 @@ static void * const qemu_st_helpers[16] = {
     [MO_BEQ]  = helper_be_stq_mmu,
 };
 
-static inline void tcg_out_adr(TCGContext *s, TCGReg rd, void *target)
+static inline void tcg_out_adr(TCGContext *s, TCGReg rd, const void *target)
 {
     ptrdiff_t offset = tcg_pcrel_diff(s, target);
     tcg_debug_assert(offset == sextract64(offset, 0, 21));
@@ -1581,7 +1586,7 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, 
TCGLabelQemuLdst *lb)
     MemOp opc = get_memop(oi);
     MemOp size = opc & MO_SIZE;
 
-    if (!reloc_pc19(lb->label_ptr[0], s->code_ptr)) {
+    if (!reloc_pc19(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
@@ -1606,7 +1611,7 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, 
TCGLabelQemuLdst *lb)
     MemOp opc = get_memop(oi);
     MemOp size = opc & MO_SIZE;
 
-    if (!reloc_pc19(lb->label_ptr[0], s->code_ptr)) {
+    if (!reloc_pc19(lb->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
         return false;
     }
 
@@ -1631,7 +1636,8 @@ static void add_qemu_ldst_label(TCGContext *s, bool 
is_ld, TCGMemOpIdx oi,
     label->type = ext;
     label->datalo_reg = data_reg;
     label->addrlo_reg = addr_reg;
-    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;
 }
 
@@ -1849,7 +1855,7 @@ static void tcg_out_qemu_st(TCGContext *s, TCGReg 
data_reg, TCGReg addr_reg,
 #endif /* CONFIG_SOFTMMU */
 }
 
-static tcg_insn_unit *tb_ret_addr;
+static const tcg_insn_unit *tb_ret_addr;
 
 static void tcg_out_op(TCGContext *s, TCGOpcode opc,
                        const TCGArg args[TCG_MAX_OP_ARGS],
@@ -2894,11 +2900,12 @@ 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_REG, TCG_REG_X0, 0);
 
     /* TB epilogue */
-    tb_ret_addr = s->code_ptr;
+    tb_ret_addr = tcg_splitwx_to_rx(s->code_ptr);
 
     /* Remove TCG locals stack space.  */
     tcg_out_insn(s, 3401, ADDI, TCG_TYPE_I64, TCG_REG_SP, TCG_REG_SP,
-- 
2.25.1




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