commit a7cf4949938743e9ecb73efcb51d27bd18d3c3fa
author Richard Henderson <richard.henderson@linaro.org> Mon Jun 17 09:12:09 2024 -0700
committer Paolo Bonzini <pbonzini@redhat.com> Tue Jul 16 18:18:24 2024 +0200
tree b3de751ec7104cd1969c2dbc1ce06303863eac6c
parent 3afc6539a84d3d003025c9352a0596dbcb350ff4

target/i386/tcg: Remove SEG_ADDL

This truncation is now handled by MMU_*32_IDX.  The introduction of
MMU_*32_IDX in fact applied correct 32-bit wraparound to 16-bit accesses
with a high segment base (e.g.  big real mode or vm86 mode), which did
not use SEG_ADDL.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Link: https://lore.kernel.org/r/20240617161210.4639-3-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/tcg/seg_helper.c

diff --git a/target/i386/tcg/seg_helper.c b/target/i386/tcg/seg_helper.c
index aee3d19..19d6b41 100644
--- a/target/i386/tcg/seg_helper.c
+++ b/target/i386/tcg/seg_helper.c
@@ -579,10 +579,6 @@
     } while (0)
 #endif
 
-/* in 64-bit machines, this can overflow. So this segment addition macro
- * can be used to trim the value to 32-bit whenever needed */
-#define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask))))
-
 /* XXX: add a is_user flag to have proper security support */
 #define PUSHW_RA(ssp, sp, sp_mask, val, ra)                      \
     {                                                            \
@@ -593,7 +589,7 @@
 #define PUSHL_RA(ssp, sp, sp_mask, val, ra)                             \
     {                                                                   \
         sp -= 4;                                                        \
-        cpu_stl_kernel_ra(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val), ra); \
+        cpu_stl_kernel_ra(env, (ssp) + (sp & (sp_mask)), (val), ra); \
     }
 
 #define POPW_RA(ssp, sp, sp_mask, val, ra)                       \
@@ -604,7 +600,7 @@
 
 #define POPL_RA(ssp, sp, sp_mask, val, ra)                              \
     {                                                                   \
-        val = (uint32_t)cpu_ldl_kernel_ra(env, SEG_ADDL(ssp, sp, sp_mask), ra); \
+        val = (uint32_t)cpu_ldl_kernel_ra(env, (ssp) + (sp & (sp_mask)), ra); \
         sp += 4;                                                        \
     }