diff options
Diffstat (limited to 'libc/syscall/mksys386')
| -rw-r--r-- | libc/syscall/mksys386 | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/libc/syscall/mksys386 b/libc/syscall/mksys386 new file mode 100644 index 0000000..be7b2d5 --- /dev/null +++ b/libc/syscall/mksys386 @@ -0,0 +1,154 @@ +# Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk> +# This file is part of the Linux-8086 C library and is distributed +# under the GNU Library General Public License. +# +# This script generates the 'simple' system calls for the 386 +# +# Each call is put into it's own object file, if the semantics of the +# call are not correct UNIX then the 4th field in the dat file has a +# marker and the function is generated with a __ prefix. +# +# +# Different levels of squeeze +# 0 = each is complete +# 1 = Short codes calling common function + +rm -f syscall.c syscall.mak call_tab.v defn_tab.v + +tr '[A-Z]' '[a-z]' < sys386.dat | \ +awk 'BEGIN{ + print "# Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>" > "syscall.mak"; + print "# This file is part of the Linux-8086 C library and is distributed" > "syscall.mak"; + print "# under the GNU Library General Public License." > "syscall.mak"; + print "# " > "syscall.mak"; + print "# This file is automatically generated\n" > "syscall.mak" + + print "/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>"; + print " * This file is part of the Linux-8086 C library and is distributed"; + print " * under the GNU Library General Public License."; + print " * "; + print " * This file is automatically generated */\n" + obj="OBJ="; + + print "/* Standard start */\n\n" + printf("#ifndef __MSDOS__\n"); + printf("#ifdef __AS386_32__\n"); + printf("#asm\n"); + printf(" .text\n"); + printf(" .align 4\n"); + printf("#endasm\n\n"); + + COMPACT=0; +} +/^[ ]*#/ { next; } +/^[ ]*$/ { next; } +{ + if( $2 > max_call ) max_call = $2; + + if( $3 == "x" || $3 == "" ) next; + else if( $4 == "-" ) next; + else if( $4 == "*" ) funcname="__" $1; + else funcname=$1; + + shortname=substr(funcname,1,12); + + if( length(obj) > 60 ) + { + printf("%s\t\\\n", obj) > "syscall.mak"; + obj=" "; + } + obj=obj shortname ".o "; + + printf "/* CALL %s */\n\n", $0; + + printf("#ifdef L_%s\n", shortname); + printf("#asm\n"); + printf("export _%s\n", funcname); + printf("_%s:\n", funcname); + + # Inline assembler max to 5 args (20 bytes) + if( $3 != 4 && $3 != 5 && ( COMPACT || $3 > 5 )) + { + if( $3 == 0 ) + { + printf(" mov eax,#%d\n", $2); + } + else + { + printf("#if __FIRST_ARG_IN_AX__\n"); + printf(" mov edx,#%d\n", $2); + printf("#else\n"); + printf(" mov eax,#%d\n", $2); + printf("#endif\n"); + } + printf(" br sys_call%d\n", $3); + } + else + { + if( $3 >= 1 ) printf("#if __FIRST_ARG_IN_AX__\n"); + if( $3 >= 5 ) printf(" push edi\n"); + if( $3 >= 4 ) printf(" push esi\n"); + if( $3 >= 5 ) printf(" mov edi,[esp+16]\n"); + if( $3 >= 4 ) printf(" mov esi,[esp+12]\n"); + if( $3 >= 3 ) printf(" mov edx,[esp+8]\n"); + if( $3 >= 2 ) printf(" mov ecx,[esp+4]\n"); + if( $3 >= 1 ) printf(" mov ebx,eax\n"); + if( $3 >= 1 ) printf("#else\n"); + if( $3 >= 5 ) printf(" push edi\n"); + if( $3 >= 4 ) printf(" push esi\n"); + if( $3 >= 5 ) printf(" mov edi,[esp+20]\n"); + if( $3 >= 4 ) printf(" mov esi,[esp+16]\n"); + if( $3 >= 3 ) printf(" mov edx,[esp+12]\n"); + if( $3 >= 2 ) printf(" mov ecx,[esp+8]\n"); + if( $3 >= 1 ) printf(" mov ebx,[esp+4]\n"); + if( $3 >= 1 ) printf("#endif\n"); + printf(" mov eax,#%d\n", $2); + printf(" int $80\n"); + + if( $3 >= 4 ) printf(" pop esi\n"); + if( $3 >= 5 ) printf(" pop edi\n"); + + printf(" test eax,eax\n"); + printf(" jl syscall_err\n"); + printf(" ret\n"); + printf("syscall_err:\n"); + printf(" neg eax\n"); + printf(" mov [_errno],eax\n"); + printf(" mov eax,#-1\n"); + printf(" ret\n"); + } + printf("#endasm\n"); + printf("#endif\n\n"); +} +END{ + + printf("#endif /* __AS386_32__ */\n\n"); + printf("#endif /* __MSDOS__ */\n\n"); + printf("%s\n", obj) > "syscall.mak"; + printf "\n" > "syscall.mak"; + +}' > syscall.c + +cat >> syscall.mak <<\! + +TOP=.. +include $(TOP)/Make.defs + +all: $(OBJ) + +libc.a: $(OBJ) + ar r ../$(LIBC) $(OBJ) + @touch libc.a + +$(OBJ): sys386.dat mksys386 + $(CC) $(CFLAGS) -c -DL_$* -o $@ syscall.c +! + +rv=$? +if [ "$rv" != 0 ] +then exit $rv +fi + +export MAKELEVEL +MAKELEVEL=0 +exec make -f syscall.mak $1 |