mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
0100301bfd
Move the low-level context switch code to an out-of-line asm stub instead of using complex inline asm. This allows constructing a new stack frame for the child process to make it seamlessly flow to ret_from_fork without an extra test and branch in __switch_to(). It also improves code generation for __schedule() by using the C calling convention instead of clobbering all registers. Signed-off-by: Brian Gerst <brgerst@gmail.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1471106302-10159-5-git-send-email-brgerst@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
#ifndef __LINUX_KBUILD_H
|
|
# error "Please do not build this file directly, build asm-offsets.c instead"
|
|
#endif
|
|
|
|
#include <asm/ucontext.h>
|
|
|
|
#include <linux/lguest.h>
|
|
#include "../../../drivers/lguest/lg.h"
|
|
|
|
#define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
|
|
static char syscalls[] = {
|
|
#include <asm/syscalls_32.h>
|
|
};
|
|
|
|
/* workaround for a warning with -Wmissing-prototypes */
|
|
void foo(void);
|
|
|
|
void foo(void)
|
|
{
|
|
OFFSET(CPUINFO_x86, cpuinfo_x86, x86);
|
|
OFFSET(CPUINFO_x86_vendor, cpuinfo_x86, x86_vendor);
|
|
OFFSET(CPUINFO_x86_model, cpuinfo_x86, x86_model);
|
|
OFFSET(CPUINFO_x86_mask, cpuinfo_x86, x86_mask);
|
|
OFFSET(CPUINFO_cpuid_level, cpuinfo_x86, cpuid_level);
|
|
OFFSET(CPUINFO_x86_capability, cpuinfo_x86, x86_capability);
|
|
OFFSET(CPUINFO_x86_vendor_id, cpuinfo_x86, x86_vendor_id);
|
|
BLANK();
|
|
|
|
OFFSET(PT_EBX, pt_regs, bx);
|
|
OFFSET(PT_ECX, pt_regs, cx);
|
|
OFFSET(PT_EDX, pt_regs, dx);
|
|
OFFSET(PT_ESI, pt_regs, si);
|
|
OFFSET(PT_EDI, pt_regs, di);
|
|
OFFSET(PT_EBP, pt_regs, bp);
|
|
OFFSET(PT_EAX, pt_regs, ax);
|
|
OFFSET(PT_DS, pt_regs, ds);
|
|
OFFSET(PT_ES, pt_regs, es);
|
|
OFFSET(PT_FS, pt_regs, fs);
|
|
OFFSET(PT_GS, pt_regs, gs);
|
|
OFFSET(PT_ORIG_EAX, pt_regs, orig_ax);
|
|
OFFSET(PT_EIP, pt_regs, ip);
|
|
OFFSET(PT_CS, pt_regs, cs);
|
|
OFFSET(PT_EFLAGS, pt_regs, flags);
|
|
OFFSET(PT_OLDESP, pt_regs, sp);
|
|
OFFSET(PT_OLDSS, pt_regs, ss);
|
|
BLANK();
|
|
|
|
OFFSET(saved_context_gdt_desc, saved_context, gdt_desc);
|
|
BLANK();
|
|
|
|
/* Offset from the sysenter stack to tss.sp0 */
|
|
DEFINE(TSS_sysenter_sp0, offsetof(struct tss_struct, x86_tss.sp0) -
|
|
offsetofend(struct tss_struct, SYSENTER_stack));
|
|
|
|
/* Offset from cpu_tss to SYSENTER_stack */
|
|
OFFSET(CPU_TSS_SYSENTER_stack, tss_struct, SYSENTER_stack);
|
|
/* Size of SYSENTER_stack */
|
|
DEFINE(SIZEOF_SYSENTER_stack, sizeof(((struct tss_struct *)0)->SYSENTER_stack));
|
|
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
|
BLANK();
|
|
OFFSET(stack_canary_offset, stack_canary, canary);
|
|
#endif
|
|
|
|
#if defined(CONFIG_LGUEST) || defined(CONFIG_LGUEST_GUEST) || defined(CONFIG_LGUEST_MODULE)
|
|
BLANK();
|
|
OFFSET(LGUEST_DATA_irq_enabled, lguest_data, irq_enabled);
|
|
OFFSET(LGUEST_DATA_irq_pending, lguest_data, irq_pending);
|
|
|
|
BLANK();
|
|
OFFSET(LGUEST_PAGES_host_gdt_desc, lguest_pages, state.host_gdt_desc);
|
|
OFFSET(LGUEST_PAGES_host_idt_desc, lguest_pages, state.host_idt_desc);
|
|
OFFSET(LGUEST_PAGES_host_cr3, lguest_pages, state.host_cr3);
|
|
OFFSET(LGUEST_PAGES_host_sp, lguest_pages, state.host_sp);
|
|
OFFSET(LGUEST_PAGES_guest_gdt_desc, lguest_pages,state.guest_gdt_desc);
|
|
OFFSET(LGUEST_PAGES_guest_idt_desc, lguest_pages,state.guest_idt_desc);
|
|
OFFSET(LGUEST_PAGES_guest_gdt, lguest_pages, state.guest_gdt);
|
|
OFFSET(LGUEST_PAGES_regs_trapnum, lguest_pages, regs.trapnum);
|
|
OFFSET(LGUEST_PAGES_regs_errcode, lguest_pages, regs.errcode);
|
|
OFFSET(LGUEST_PAGES_regs, lguest_pages, regs);
|
|
#endif
|
|
BLANK();
|
|
DEFINE(__NR_syscall_max, sizeof(syscalls) - 1);
|
|
DEFINE(NR_syscalls, sizeof(syscalls));
|
|
}
|