[Qemu-devel] [PATCH 05/15] tcg-mips: Adjust prologue for mips64

[Richard Henderson <rth@twiddle.net>]

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/mips/tcg-target.c | 57 ++++++++++++++++++++++++---------------------------
 1 file changed, 27 insertions(+), 30 deletions(-)

diff --git a/tcg/mips/tcg-target.c b/tcg/mips/tcg-target.c
index 8f90360..89083fb 100644
--- a/tcg/mips/tcg-target.c
+++ b/tcg/mips/tcg-target.c
@@ -760,16 +760,6 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
     tcg_out_ldst(s, opc, arg, arg1, arg2);
 }
 
-static inline void tcg_out_addi(TCGContext *s, TCGReg reg, TCGArg val)
-{
-    if (val == (int16_t)val) {
-        tcg_out_opc_imm(s, OPC_ADDIU, reg, reg, val);
-    } else {
-        tcg_out_movi(s, TCG_TYPE_PTR, TCG_TMP0, val);
-        tcg_out_opc_reg(s, OPC_ADDU, reg, reg, TCG_TMP0);
-    }
-}
-
 static void tcg_out_addsub2(TCGContext *s, TCGReg rl, TCGReg rh, TCGReg al,
                             TCGReg ah, TCGArg bl, TCGArg bh, bool cbl,
                             bool cbh, bool is_sub)
@@ -2227,41 +2217,48 @@ static void tcg_target_detect_isa(void)
     sigaction(SIGILL, &sa_old, NULL);
 }
 
+/* Stack frame parameters.  */
+#define REG_SIZE   (TCG_TARGET_REG_BITS / 8)
+#define SAVE_SIZE  ((int)ARRAY_SIZE(tcg_target_callee_save_regs) * REG_SIZE)
+#define TEMP_SIZE  (CPU_TEMP_BUF_NLONGS * (int)sizeof(long))
+
+#define FRAME_SIZE ((TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE + SAVE_SIZE \
+                     + TCG_TARGET_STACK_ALIGN - 1) \
+                    & -TCG_TARGET_STACK_ALIGN)
+#define SAVE_OFS   (TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE)
+
+/* We're expecting to be able to use an immediate for frame allocation.  */
+QEMU_BUILD_BUG_ON(FRAME_SIZE > 0x7fff);
+
 /* Generate global QEMU prologue and epilogue code */
 static void tcg_target_qemu_prologue(TCGContext *s)
 {
-    int i, frame_size;
-
-    /* reserve some stack space, also for TCG temps. */
-    frame_size = ARRAY_SIZE(tcg_target_callee_save_regs) * 4
-                 + TCG_STATIC_CALL_ARGS_SIZE
-                 + CPU_TEMP_BUF_NLONGS * sizeof(long);
-    frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) &
-                 ~(TCG_TARGET_STACK_ALIGN - 1);
-    tcg_set_frame(s, TCG_REG_SP, ARRAY_SIZE(tcg_target_callee_save_regs) * 4
-                  + TCG_STATIC_CALL_ARGS_SIZE,
-                  CPU_TEMP_BUF_NLONGS * sizeof(long));
+    int i;
+
+    tcg_set_frame(s, TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE, TEMP_SIZE);
 
     /* TB prologue */
-    tcg_out_addi(s, TCG_REG_SP, -frame_size);
-    for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) {
-        tcg_out_st(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i],
-                   TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4);
+    tcg_out_opc_imm(s, ALIAS_PADDI, TCG_REG_SP, TCG_REG_SP, -FRAME_SIZE);
+    for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
+        tcg_out_st(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
+                   TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
     }
 
     /* Call generated code */
     tcg_out_opc_reg(s, OPC_JR, 0, tcg_target_call_iarg_regs[1], 0);
+    /* delay slot */
     tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
-    tb_ret_addr = s->code_ptr;
 
     /* TB epilogue */
-    for(i = 0 ; i < ARRAY_SIZE(tcg_target_callee_save_regs) ; i++) {
-        tcg_out_ld(s, TCG_TYPE_I32, tcg_target_callee_save_regs[i],
-                   TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE + i * 4);
+    tb_ret_addr = s->code_ptr;
+    for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
+        tcg_out_ld(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
+                   TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
     }
 
     tcg_out_opc_reg(s, OPC_JR, 0, TCG_REG_RA, 0);
-    tcg_out_addi(s, TCG_REG_SP, frame_size);
+    /* delay slot */
+    tcg_out_opc_imm(s, ALIAS_PADDI, TCG_REG_SP, TCG_REG_SP, FRAME_SIZE);
 }
 
 static void tcg_target_init(TCGContext *s)
-- 
2.5.0