1 files changed, 24 insertions, 0 deletions

diff --git a/src/vm_x86.dasc b/src/vm_x86.dasc
index 58266196..f31e595b 100644
--- a/src/vm_x86.dasc
+++ b/src/vm_x86.dasc
@@ -222,6 +222,9 @@
 |.define CFRAME_SPACE,  aword*5                 // Delta for rsp (see <--).
 |.macro saveregs_
 |  push rbx; push r15; push r14
+|.if NO_UNWIND
+|  push r13; push r12
+|.endif
 |  sub rsp, CFRAME_SPACE
 |.endmacro
 |.macro saveregs
@@ -229,15 +232,28 @@
 |.endmacro
 |.macro restoreregs
 |  add rsp, CFRAME_SPACE
+|.if NO_UNWIND
+|  pop r12; pop r13
+|.endif
 |  pop r14; pop r15; pop rbx; pop rbp
 |.endmacro
 |
 |//----- 16 byte aligned,
+|.if NO_UNWIND
+|.define SAVE_RET,      aword [rsp+aword*11]    //<-- rsp entering interpreter.
+|.define SAVE_R4,       aword [rsp+aword*10]
+|.define SAVE_R3,       aword [rsp+aword*9]
+|.define SAVE_R2,       aword [rsp+aword*8]
+|.define SAVE_R1,       aword [rsp+aword*7]
+|.define SAVE_RU2,      aword [rsp+aword*6]
+|.define SAVE_RU1,      aword [rsp+aword*5]     //<-- rsp after register saves.
+|.else
 |.define SAVE_RET,      aword [rsp+aword*9]     //<-- rsp entering interpreter.
 |.define SAVE_R4,       aword [rsp+aword*8]
 |.define SAVE_R3,       aword [rsp+aword*7]
 |.define SAVE_R2,       aword [rsp+aword*6]
 |.define SAVE_R1,       aword [rsp+aword*5]     //<-- rsp after register saves.
+|.endif
 |.define SAVE_CFRAME,   aword [rsp+aword*4]
 |.define SAVE_PC,       dword [rsp+dword*7]
 |.define SAVE_L,        dword [rsp+dword*6]
@@ -5422,6 +5438,10 @@ static void emit_asm_debug(BuildCtx *ctx)
         "\t.byte 0x83\n\t.uleb128 0x3\n"        /* offset rbx */
         "\t.byte 0x8f\n\t.uleb128 0x4\n"        /* offset r15 */
         "\t.byte 0x8e\n\t.uleb128 0x5\n"        /* offset r14 */
+#if LJ_NO_UNWIND
+        "\t.byte 0x8d\n\t.uleb128 0x6\n"        /* offset r13 */
+        "\t.byte 0x8c\n\t.uleb128 0x7\n"        /* offset r12 */
+#endif
 #else
         "\t.long .Lbegin\n"
         "\t.long %d\n"
@@ -5457,6 +5477,7 @@ static void emit_asm_debug(BuildCtx *ctx)
         "\t.align " SZPTR "\n"
         ".LEFDE1:\n\n", (int)ctx->codesz - fcofs);
 #endif
+#if !LJ_NO_UNWIND
 #if (defined(__sun__) && defined(__svr4__))
 #if LJ_64
     fprintf(ctx->fp, "\t.section .eh_frame,\"a\",@unwind\n");
@@ -5545,7 +5566,9 @@ static void emit_asm_debug(BuildCtx *ctx)
         "\t.align " SZPTR "\n"
         ".LEFDE3:\n\n", (int)ctx->codesz - fcofs);
 #endif
+#endif
     break;
+#if !LJ_NO_UNWIND
   /* Mental note: never let Apple design an assembler.
   ** Or a linker. Or a plastic case. But I digress.
   */
@@ -5679,6 +5702,7 @@ static void emit_asm_debug(BuildCtx *ctx)
     fprintf(ctx->fp, ".subsections_via_symbols\n");
     }
     break;
+#endif
   default:  /* Difficult for other modes. */
     break;
   }