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Subject[PATCH 18/30] x32: Generate <asm/unistd_x32.h>
Date
From: "H. Peter Anvin" <hpa@zytor.com>

Generate <asm/unistd_x32.h>; this exports x32 system call numbers to
user space.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/include/asm/Kbuild | 1 +
arch/x86/include/asm/unistd.h | 7 ++++++-
arch/x86/syscalls/Makefile | 10 ++++++++--
3 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index 986954f..f9c0d3b 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -25,3 +25,4 @@ header-y += vsyscall.h

genhdr-y += unistd_32.h
genhdr-y += unistd_64.h
+genhdr-y += unistd_x32.h
diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h
index 21f77b8..dab5349 100644
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
@@ -1,6 +1,9 @@
#ifndef _ASM_X86_UNISTD_H
#define _ASM_X86_UNISTD_H 1

+/* x32 syscall flag bit */
+#define __X32_SYSCALL_BIT 0x40000000
+
#ifdef __KERNEL__
# ifdef CONFIG_X86_32

@@ -52,8 +55,10 @@
#else
# ifdef __i386__
# include <asm/unistd_32.h>
-# else
+# elif defined(__LP64__)
# include <asm/unistd_64.h>
+# else
+# include <asm/unistd_x32.h>
# endif
#endif

diff --git a/arch/x86/syscalls/Makefile b/arch/x86/syscalls/Makefile
index 89dd958..54bdbd7 100644
--- a/arch/x86/syscalls/Makefile
+++ b/arch/x86/syscalls/Makefile
@@ -11,7 +11,8 @@ systbl := $(srctree)/$(src)/syscalltbl.sh

quiet_cmd_syshdr = SYSHDR $@
cmd_syshdr = $(CONFIG_SHELL) '$(syshdr)' $< $@ \
- $(syshdr_abi_$(basetarget)) $(syshdr_pfx_$(basetarget))
+ $(syshdr_abi_$(basetarget)) $(syshdr_pfx_$(basetarget)) \
+ $(syshdr_offset_$(basetarget))
quiet_cmd_systbl = SYSTBL $@
cmd_systbl = $(CONFIG_SHELL) '$(systbl)' $< $@

@@ -24,6 +25,11 @@ syshdr_pfx_unistd_32_ia32 := ia32_
$(out)/unistd_32_ia32.h: $(syscall32) $(syshdr)
$(call if_changed,syshdr)

+syshdr_abi_unistd_x32 := common,x32
+syshdr_offset_unistd_x32 := __X32_SYSCALL_BIT
+$(out)/unistd_x32.h: $(syscall64) $(syshdr)
+ $(call if_changed,syshdr)
+
syshdr_abi_unistd_64 := common,64
$(out)/unistd_64.h: $(syscall64) $(syshdr)
$(call if_changed,syshdr)
@@ -33,7 +39,7 @@ $(out)/syscalls_32.h: $(syscall32) $(systbl)
$(out)/syscalls_64.h: $(syscall64) $(systbl)
$(call if_changed,systbl)

-syshdr-y += unistd_32.h unistd_64.h
+syshdr-y += unistd_32.h unistd_64.h unistd_x32.h
syshdr-y += syscalls_32.h
syshdr-$(CONFIG_X86_64) += unistd_32_ia32.h
syshdr-$(CONFIG_X86_64) += syscalls_64.h
--
1.7.6.5


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