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[PATCH] uml: start cross-build support : mk_user_constants

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Beginning of cross-build fixes.  Instead of expecting that mk_user_constants
(compiled and executed on the build box) will see the sizeof, etc.  for target
box, we do what every architecture already does for asm-offsets.  Namely, have
user-offsets.c compiled *for* *target* into user-offsets.s and sed it into the
header with relevant constants.  We don't need to reinvent any wheels - all
tools are already there.

This patch deals with mk_user_constants.  It doesn't assume any relationship
between target and build environment anymore - we pick all defines we need
from user-offsets.h.  Later patches will deal with the rest of mk_...  helpers
in the same way.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Al Viro 2005-05-05 16:15:23 -07:00 committed by Linus Torvalds
parent fcddd72e3e
commit 8d0b9dc9be
5 changed files with 158 additions and 9 deletions
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8
arch/um/Makefile
View File

@ -166,6 +166,14 @@ endef
$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
$(call filechk,umlconfig)
$(ARCH_DIR)/user-offsets.s: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.c
$(CC) $(USER_CFLAGS) -S -o $@ $<
$(ARCH_DIR)/user-offsets.h: $(ARCH_DIR)/user-offsets.s
$(call filechk,gen-asm-offsets)
CLEAN_FILES += $(ARCH_DIR)/user-offsets.s $(ARCH_DIR)/user-offsets.h
$(ARCH_DIR)/include/task.h: $(ARCH_DIR)/util/mk_task
$(call filechk,gen_header)

2
arch/um/os-Linux/util/Makefile
View File

@ -1,4 +1,4 @@
hostprogs-y := mk_user_constants
always := $(hostprogs-y)
mk_user_constants-objs := mk_user_constants.o
HOSTCFLAGS_mk_user_constants.o := -I$(objtree)/arch/um

10
arch/um/os-Linux/util/mk_user_constants.c
View File

@ -1,11 +1,5 @@
#include <stdio.h>
#include <asm/types.h>
/* For some reason, x86_64 nowhere defines u64 and u32, even though they're
* used throughout the headers.
*/
typedef __u64 u64;
typedef __u32 u32;
#include <asm/user.h>
#include <user-offsets.h>
int main(int argc, char **argv)
{
@ -20,7 +14,7 @@ int main(int argc, char **argv)
* x86_64 (216 vs 168 bytes). user_regs_struct is the correct size on
* both x86_64 and i386.
*/
printf("#define UM_FRAME_SIZE %d\n", (int) sizeof(struct user_regs_struct));
printf("#define UM_FRAME_SIZE %d\n", __UM_FRAME_SIZE);
printf("\n");
printf("#endif\n");

69
arch/um/sys-i386/user-offsets.c Normal file
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@ -0,0 +1,69 @@
#include <stdio.h>
#include <signal.h>
#include <asm/ptrace.h>
#include <asm/user.h>
#include <linux/stddef.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
#define OFFSET(sym, str, mem) \
DEFINE(sym, offsetof(struct str, mem));
void foo(void)
{
OFFSET(SC_IP, sigcontext, eip);
OFFSET(SC_SP, sigcontext, esp);
OFFSET(SC_FS, sigcontext, fs);
OFFSET(SC_GS, sigcontext, gs);
OFFSET(SC_DS, sigcontext, ds);
OFFSET(SC_ES, sigcontext, es);
OFFSET(SC_SS, sigcontext, ss);
OFFSET(SC_CS, sigcontext, cs);
OFFSET(SC_EFLAGS, sigcontext, eflags);
OFFSET(SC_EAX, sigcontext, eax);
OFFSET(SC_EBX, sigcontext, ebx);
OFFSET(SC_ECX, sigcontext, ecx);
OFFSET(SC_EDX, sigcontext, edx);
OFFSET(SC_EDI, sigcontext, edi);
OFFSET(SC_ESI, sigcontext, esi);
OFFSET(SC_EBP, sigcontext, ebp);
OFFSET(SC_TRAPNO, sigcontext, trapno);
OFFSET(SC_ERR, sigcontext, err);
OFFSET(SC_CR2, sigcontext, cr2);
OFFSET(SC_FPSTATE, sigcontext, fpstate);
OFFSET(SC_SIGMASK, sigcontext, oldmask);
OFFSET(SC_FP_CW, _fpstate, cw);
OFFSET(SC_FP_SW, _fpstate, sw);
OFFSET(SC_FP_TAG, _fpstate, tag);
OFFSET(SC_FP_IPOFF, _fpstate, ipoff);
OFFSET(SC_FP_CSSEL, _fpstate, cssel);
OFFSET(SC_FP_DATAOFF, _fpstate, dataoff);
OFFSET(SC_FP_DATASEL, _fpstate, datasel);
OFFSET(SC_FP_ST, _fpstate, _st);
OFFSET(SC_FXSR_ENV, _fpstate, _fxsr_env);
DEFINE(HOST_FRAME_SIZE, FRAME_SIZE);
DEFINE(HOST_FP_SIZE,
sizeof(struct user_i387_struct) / sizeof(unsigned long));
DEFINE(HOST_XFP_SIZE,
sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
DEFINE(HOST_IP, EIP);
DEFINE(HOST_SP, UESP);
DEFINE(HOST_EFLAGS, EFL);
DEFINE(HOST_EAX, EAX);
DEFINE(HOST_EBX, EBX);
DEFINE(HOST_ECX, ECX);
DEFINE(HOST_EDX, EDX);
DEFINE(HOST_ESI, ESI);
DEFINE(HOST_EDI, EDI);
DEFINE(HOST_EBP, EBP);
DEFINE(HOST_CS, CS);
DEFINE(HOST_SS, SS);
DEFINE(HOST_DS, DS);
DEFINE(HOST_FS, FS);
DEFINE(HOST_ES, ES);
DEFINE(HOST_GS, GS);
DEFINE(__UM_FRAME_SIZE, sizeof(struct user_regs_struct));
}

78
arch/um/sys-x86_64/user-offsets.c Normal file
View File

@ -0,0 +1,78 @@
#include <stdio.h>
#include <stddef.h>
#include <signal.h>
#define __FRAME_OFFSETS
#include <asm/ptrace.h>
#include <asm/user.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
#define OFFSET(sym, str, mem) \
DEFINE(sym, offsetof(struct str, mem));
void foo(void)
{
OFFSET(SC_RBX, sigcontext, rbx);
OFFSET(SC_RCX, sigcontext, rcx);
OFFSET(SC_RDX, sigcontext, rdx);
OFFSET(SC_RSI, sigcontext, rsi);
OFFSET(SC_RDI, sigcontext, rdi);
OFFSET(SC_RBP, sigcontext, rbp);
OFFSET(SC_RAX, sigcontext, rax);
OFFSET(SC_R8, sigcontext, r8);
OFFSET(SC_R9, sigcontext, r9);
OFFSET(SC_R10, sigcontext, r10);
OFFSET(SC_R11, sigcontext, r11);
OFFSET(SC_R12, sigcontext, r12);
OFFSET(SC_R13, sigcontext, r13);
OFFSET(SC_R14, sigcontext, r14);
OFFSET(SC_R15, sigcontext, r15);
OFFSET(SC_IP, sigcontext, rip);
OFFSET(SC_SP, sigcontext, rsp);
OFFSET(SC_CR2, sigcontext, cr2);
OFFSET(SC_ERR, sigcontext, err);
OFFSET(SC_TRAPNO, sigcontext, trapno);
OFFSET(SC_CS, sigcontext, cs);
OFFSET(SC_FS, sigcontext, fs);
OFFSET(SC_GS, sigcontext, gs);
OFFSET(SC_EFLAGS, sigcontext, eflags);
OFFSET(SC_SIGMASK, sigcontext, oldmask);
#if 0
OFFSET(SC_ORIG_RAX, sigcontext, orig_rax);
OFFSET(SC_DS, sigcontext, ds);
OFFSET(SC_ES, sigcontext, es);
OFFSET(SC_SS, sigcontext, ss);
#endif
DEFINE(HOST_FRAME_SIZE, FRAME_SIZE);
DEFINE(HOST_RBX, RBX);
DEFINE(HOST_RCX, RCX);
DEFINE(HOST_RDI, RDI);
DEFINE(HOST_RSI, RSI);
DEFINE(HOST_RDX, RDX);
DEFINE(HOST_RBP, RBP);
DEFINE(HOST_RAX, RAX);
DEFINE(HOST_R8, R8);
DEFINE(HOST_R9, R9);
DEFINE(HOST_R10, R10);
DEFINE(HOST_R11, R11);
DEFINE(HOST_R12, R12);
DEFINE(HOST_R13, R13);
DEFINE(HOST_R14, R14);
DEFINE(HOST_R15, R15);
DEFINE(HOST_ORIG_RAX, ORIG_RAX);
DEFINE(HOST_CS, CS);
DEFINE(HOST_SS, SS);
DEFINE(HOST_EFLAGS, EFLAGS);
#if 0
DEFINE(HOST_FS, FS);
DEFINE(HOST_GS, GS);
DEFINE(HOST_DS, DS);
DEFINE(HOST_ES, ES);
#endif
DEFINE(HOST_IP, RIP);
DEFINE(HOST_SP, RSP);
DEFINE(__UM_FRAME_SIZE, sizeof(struct user_regs_struct));
}