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[PATCH 37/50] target/i386: Remove pc_start argument to gen_svm_check_int


From: Richard Henderson
Subject: [PATCH 37/50] target/i386: Remove pc_start argument to gen_svm_check_intercept
Date: Sun, 28 Feb 2021 15:23:08 -0800

When exiting helper_svm_check_intercept via exception, cpu_vmexit
calls cpu_restore_state, which will recover eip and cc_op via unwind.
Therefore we do not need to store eip or cc_op before the call.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/i386/tcg/translate.c | 45 +++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 24 deletions(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index cbc0cc3ccc..33faffe00f 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -2423,15 +2423,12 @@ static inline int svm_is_rep(int prefixes)
     return ((prefixes & (PREFIX_REPZ | PREFIX_REPNZ)) ? 8 : 0);
 }
 
-static void gen_svm_check_intercept(DisasContext *s, target_ulong pc_start,
-                                    uint32_t type)
+static void gen_svm_check_intercept(DisasContext *s, uint32_t type)
 {
     /* no SVM activated; fast case */
     if (likely(!GUEST(s))) {
         return;
     }
-    gen_update_cc_op(s);
-    gen_jmp_im(s, pc_start - s->cs_base);
     gen_helper_svm_check_intercept(cpu_env, tcg_constant_i32(type));
 }
 
@@ -6633,7 +6630,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         val = 0;
         goto do_lret;
     case 0xcf: /* iret */
-        gen_svm_check_intercept(s, pc_start, SVM_EXIT_IRET);
+        gen_svm_check_intercept(s, SVM_EXIT_IRET);
         if (!PE(s) || VM86(s)) {
             /* real mode or vm86 mode */
             if (!check_vm86_iopl(s)) {
@@ -6755,7 +6752,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         /************************/
         /* flags */
     case 0x9c: /* pushf */
-        gen_svm_check_intercept(s, pc_start, SVM_EXIT_PUSHF);
+        gen_svm_check_intercept(s, SVM_EXIT_PUSHF);
         if (check_vm86_iopl(s)) {
             gen_update_cc_op(s);
             gen_helper_read_eflags(s->T0, cpu_env);
@@ -6763,7 +6760,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         }
         break;
     case 0x9d: /* popf */
-        gen_svm_check_intercept(s, pc_start, SVM_EXIT_POPF);
+        gen_svm_check_intercept(s, SVM_EXIT_POPF);
         if (check_vm86_iopl(s)) {
             ot = gen_pop_T0(s);
             if (CPL(s) == 0) {
@@ -7137,7 +7134,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         break;
 #ifdef WANT_ICEBP
     case 0xf1: /* icebp (undocumented, exits to external debugger) */
-        gen_svm_check_intercept(s, pc_start, SVM_EXIT_ICEBP);
+        gen_svm_check_intercept(s, SVM_EXIT_ICEBP);
         gen_debug(s);
         break;
 #endif
@@ -7341,7 +7338,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         case 0: /* sldt */
             if (!PE(s) || VM86(s))
                 goto illegal_op;
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_LDTR_READ);
+            gen_svm_check_intercept(s, SVM_EXIT_LDTR_READ);
             tcg_gen_ld32u_tl(s->T0, cpu_env,
                              offsetof(CPUX86State, ldt.selector));
             ot = mod == 3 ? dflag : MO_16;
@@ -7351,7 +7348,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             if (!PE(s) || VM86(s))
                 goto illegal_op;
             if (check_cpl0(s)) {
-                gen_svm_check_intercept(s, pc_start, SVM_EXIT_LDTR_WRITE);
+                gen_svm_check_intercept(s, SVM_EXIT_LDTR_WRITE);
                 gen_ldst_modrm(env, s, modrm, MO_16, OR_TMP0, 0);
                 tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
                 gen_helper_lldt(cpu_env, s->tmp2_i32);
@@ -7360,7 +7357,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         case 1: /* str */
             if (!PE(s) || VM86(s))
                 goto illegal_op;
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_TR_READ);
+            gen_svm_check_intercept(s, SVM_EXIT_TR_READ);
             tcg_gen_ld32u_tl(s->T0, cpu_env,
                              offsetof(CPUX86State, tr.selector));
             ot = mod == 3 ? dflag : MO_16;
@@ -7370,7 +7367,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             if (!PE(s) || VM86(s))
                 goto illegal_op;
             if (check_cpl0(s)) {
-                gen_svm_check_intercept(s, pc_start, SVM_EXIT_TR_WRITE);
+                gen_svm_check_intercept(s, SVM_EXIT_TR_WRITE);
                 gen_ldst_modrm(env, s, modrm, MO_16, OR_TMP0, 0);
                 tcg_gen_trunc_tl_i32(s->tmp2_i32, s->T0);
                 gen_helper_ltr(cpu_env, s->tmp2_i32);
@@ -7398,7 +7395,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         modrm = x86_ldub_code(env, s);
         switch (modrm) {
         CASE_MODRM_MEM_OP(0): /* sgdt */
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_GDTR_READ);
+            gen_svm_check_intercept(s, SVM_EXIT_GDTR_READ);
             gen_lea_modrm(env, s, modrm);
             tcg_gen_ld32u_tl(s->T0,
                              cpu_env, offsetof(CPUX86State, gdt.limit));
@@ -7454,7 +7451,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             break;
 
         CASE_MODRM_MEM_OP(1): /* sidt */
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_IDTR_READ);
+            gen_svm_check_intercept(s, SVM_EXIT_IDTR_READ);
             gen_lea_modrm(env, s, modrm);
             tcg_gen_ld32u_tl(s->T0, cpu_env, offsetof(CPUX86State, idt.limit));
             gen_op_st_v(s, MO_16, s->T0, s->A0);
@@ -7574,7 +7571,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
                 || !PE(s)) {
                 goto illegal_op;
             }
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_SKINIT);
+            gen_svm_check_intercept(s, SVM_EXIT_SKINIT);
             /* If not intercepted, not implemented -- raise #UD. */
             goto illegal_op;
 
@@ -7594,7 +7591,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             if (!check_cpl0(s)) {
                 break;
             }
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_GDTR_WRITE);
+            gen_svm_check_intercept(s, SVM_EXIT_GDTR_WRITE);
             gen_lea_modrm(env, s, modrm);
             gen_op_ld_v(s, MO_16, s->T1, s->A0);
             gen_add_A0_im(s, 2);
@@ -7610,7 +7607,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             if (!check_cpl0(s)) {
                 break;
             }
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_IDTR_WRITE);
+            gen_svm_check_intercept(s, SVM_EXIT_IDTR_WRITE);
             gen_lea_modrm(env, s, modrm);
             gen_op_ld_v(s, MO_16, s->T1, s->A0);
             gen_add_A0_im(s, 2);
@@ -7623,7 +7620,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             break;
 
         CASE_MODRM_OP(4): /* smsw */
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_READ_CR0);
+            gen_svm_check_intercept(s, SVM_EXIT_READ_CR0);
             tcg_gen_ld_tl(s->T0, cpu_env, offsetof(CPUX86State, cr[0]));
             /*
              * In 32-bit mode, the higher 16 bits of the destination
@@ -7655,7 +7652,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
             if (!check_cpl0(s)) {
                 break;
             }
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_WRITE_CR0);
+            gen_svm_check_intercept(s, SVM_EXIT_WRITE_CR0);
             gen_ldst_modrm(env, s, modrm, MO_16, OR_TMP0, 0);
             gen_helper_lmsw(cpu_env, s->T0);
             gen_jmp_im(s, s->pc - s->cs_base);
@@ -7712,7 +7709,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
     case 0x108: /* invd */
     case 0x109: /* wbinvd */
         if (check_cpl0(s)) {
-            gen_svm_check_intercept(s, pc_start, (b & 2) ? SVM_EXIT_INVD : 
SVM_EXIT_WBINVD);
+            gen_svm_check_intercept(s, (b & 2) ? SVM_EXIT_INVD : 
SVM_EXIT_WBINVD);
             /* nothing to do */
         }
         break;
@@ -8102,14 +8099,14 @@ static target_ulong disas_insn(DisasContext *s, 
CPUState *cpu)
                 goto illegal_op;
             }
             if (b & 2) {
-                gen_svm_check_intercept(s, pc_start, SVM_EXIT_WRITE_DR0 + reg);
+                gen_svm_check_intercept(s, SVM_EXIT_WRITE_DR0 + reg);
                 gen_op_mov_v_reg(s, ot, s->T0, rm);
                 tcg_gen_movi_i32(s->tmp2_i32, reg);
                 gen_helper_set_dr(cpu_env, s->tmp2_i32, s->T0);
                 gen_jmp_im(s, s->pc - s->cs_base);
                 gen_eob(s);
             } else {
-                gen_svm_check_intercept(s, pc_start, SVM_EXIT_READ_DR0 + reg);
+                gen_svm_check_intercept(s, SVM_EXIT_READ_DR0 + reg);
                 tcg_gen_movi_i32(s->tmp2_i32, reg);
                 gen_helper_get_dr(s->T0, cpu_env, s->tmp2_i32);
                 gen_op_mov_reg_v(s, ot, rm, s->T0);
@@ -8118,7 +8115,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         break;
     case 0x106: /* clts */
         if (check_cpl0(s)) {
-            gen_svm_check_intercept(s, pc_start, SVM_EXIT_WRITE_CR0);
+            gen_svm_check_intercept(s, SVM_EXIT_WRITE_CR0);
             gen_helper_clts(cpu_env);
             /* abort block because static cpu state changed */
             gen_jmp_im(s, s->pc - s->cs_base);
@@ -8345,7 +8342,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState 
*cpu)
         gen_nop_modrm(env, s, modrm);
         break;
     case 0x1aa: /* rsm */
-        gen_svm_check_intercept(s, pc_start, SVM_EXIT_RSM);
+        gen_svm_check_intercept(s, SVM_EXIT_RSM);
         if (!(s->flags & HF_SMM_MASK))
             goto illegal_op;
 #ifdef CONFIG_USER_ONLY
-- 
2.25.1




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