[PATCH v2 2/9] winebuild: Introduce a new -nofpu syscall spec flag.

[Rémi Bernon]

From: Rémi Bernon

Stored in the syscall table index highest bit.
---
 tools/winebuild/build.h          | 1 +
 tools/winebuild/import.c         | 1 +
 tools/winebuild/parser.c         | 6 ++++++
 tools/winebuild/winebuild.man.in | 4 ++++
 4 files changed, 12 insertions(+)

diff --git a/tools/winebuild/build.h b/tools/winebuild/build.h
index 576304cd2b8..216f6859fe7 100644
--- a/tools/winebuild/build.h
+++ b/tools/winebuild/build.h
@@ -189,6 +189,7 @@ static inline int is_pe(void)
 #define FLAG_FASTCALL  0x0100  /* function uses fastcall calling convention */
 #define FLAG_SYSCALL   0x0200  /* function is a system call */
 #define FLAG_IMPORT    0x0400  /* export is imported from another module */
+#define FLAG_NOFPU     0x0800  /* function skips default syscall FPU save / restore */

#define FLAG_FORWARD   0x1000  /* function is a forwarded name */
 #define FLAG_EXT_LINK  0x2000  /* function links to an external symbol */
diff --git a/tools/winebuild/import.c b/tools/winebuild/import.c
index 9f87adcf593..18ca6eaef01 100644
--- a/tools/winebuild/import.c
+++ b/tools/winebuild/import.c
@@ -1385,6 +1385,7 @@ void output_syscalls( DLLSPEC *spec )
         ORDDEF *odp = syscalls[i];
         const char *name = get_link_name(odp);
         unsigned int id = (spec->syscall_table << 12) + i;
+        if (odp->flags & FLAG_NOFPU) id |= (1u << 31);

output( "\t.align %d\n", get_alignment(16) );
         output( "\t%s\n", func_declaration(name) );
diff --git a/tools/winebuild/parser.c b/tools/winebuild/parser.c
index 11b422bd435..0a1fbe52e62 100644
--- a/tools/winebuild/parser.c
+++ b/tools/winebuild/parser.c
@@ -71,6 +71,7 @@ static const char * const FlagNames[] =
     "fastcall",    /* FLAG_FASTCALL */
     "syscall",     /* FLAG_SYSCALL */
     "import",      /* FLAG_IMPORT */
+    "nofpu",       /* FLAG_NOFPU */
     NULL
 };

@@ -328,6 +329,11 @@ static int parse_spec_arguments( ORDDEF *odp, DLLSPEC *spec, int optional )
             return 0;
         }
     }
+    else if (odp->flags & FLAG_NOFPU)
+    {
+        error( "The nofpu flag can only be used on a syscall function\n" );
+        return 0;
+    }
     return 1;
 }

diff --git a/tools/winebuild/winebuild.man.in b/tools/winebuild/winebuild.man.in
index 23ef3495744..ce016b542fb 100644
--- a/tools/winebuild/winebuild.man.in
+++ b/tools/winebuild/winebuild.man.in
@@ -324,6 +324,10 @@ only).
 The entry point will be exported by ordinal instead of by name. The
 name is still available for importing.
 .TP
+.B -nofpu
+The entry point is a NT syscall which does not save or restore the
+FPU state and assumes it will not be modified by the call.
+.TP
 .B -ret16
 The function returns a 16-bit value (Win16 only).
 .TP