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x86/entry: Convert Segment not present exception to IDTENTRY 

Convert #NP to IDTENTRY_ERRORCODE:
  - Implement the C entry point with DEFINE_IDTENTRY
  - Emit the ASM stub with DECLARE_IDTENTRY
  - Remove the ASM idtentry in 64bit
  - Remove the open coded ASM entry code in 32bit
  - Fixup the XEN/PV code
  - Remove the old prototypes

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134905.443591450@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:16:23 +01:00
parent 97b3d290b8
commit 99a3fb8d01
8 changed files with 10 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/entry/entry_32.S
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@ -1318,12 +1318,6 @@ SYM_CODE_START(native_iret)
SYM_CODE_END(native_iret)
#endif
SYM_CODE_START(segment_not_present)
ASM_CLAC
pushl $do_segment_not_present
jmp common_exception
SYM_CODE_END(segment_not_present)
SYM_CODE_START(stack_segment)
ASM_CLAC
pushl $do_stack_segment

1
arch/x86/entry/entry_64.S
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@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
*/
idtentry X86_TRAP_BP int3 do_int3 has_error_code=0
idtentry X86_TRAP_NP segment_not_present do_segment_not_present has_error_code=1
idtentry X86_TRAP_SS stack_segment do_stack_segment has_error_code=1
idtentry X86_TRAP_GP general_protection do_general_protection has_error_code=1
idtentry X86_TRAP_SPURIOUS spurious_interrupt_bug do_spurious_interrupt_bug has_error_code=0

1
arch/x86/include/asm/idtentry.h
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@ -132,5 +132,6 @@ DECLARE_IDTENTRY(X86_TRAP_OLD_MF, exc_coproc_segment_overrun);
/* Simple exception entries with error code pushed by hardware */
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
#endif

3
arch/x86/include/asm/traps.h
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@ -17,7 +17,6 @@ asmlinkage void int3(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
#endif
asmlinkage void segment_not_present(void);
asmlinkage void stack_segment(void);
asmlinkage void general_protection(void);
asmlinkage void page_fault(void);
@ -35,7 +34,6 @@ asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
asmlinkage void xen_double_fault(void);
asmlinkage void xen_segment_not_present(void);
asmlinkage void xen_stack_segment(void);
asmlinkage void xen_general_protection(void);
asmlinkage void xen_page_fault(void);
@ -52,7 +50,6 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
dotraplinkage void do_int3(struct pt_regs *regs, long error_code);
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
dotraplinkage void do_segment_not_present(struct pt_regs *regs, long error_code);
dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code);
dotraplinkage void do_general_protection(struct pt_regs *regs, long error_code);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);

2
arch/x86/kernel/idt.c
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@ -80,7 +80,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_NM, asm_exc_device_not_available),
INTG(X86_TRAP_OLD_MF, asm_exc_coproc_segment_overrun),
INTG(X86_TRAP_TS, asm_exc_invalid_tss),
INTG(X86_TRAP_NP, segment_not_present),
INTG(X86_TRAP_NP, asm_exc_segment_not_present),
INTG(X86_TRAP_SS, stack_segment),
INTG(X86_TRAP_GP, general_protection),
INTG(X86_TRAP_SPURIOUS, spurious_interrupt_bug),

7
arch/x86/kernel/traps.c
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@ -258,6 +258,12 @@ DEFINE_IDTENTRY_ERRORCODE(exc_invalid_tss)
0, NULL);
}
DEFINE_IDTENTRY_ERRORCODE(exc_segment_not_present)
{
do_error_trap(regs, error_code, "segment not present", X86_TRAP_NP,
SIGBUS, 0, NULL);
}
#define IP ((void __user *)uprobe_get_trap_addr(regs))
#define DO_ERROR(trapnr, signr, sicode, addr, str, name) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
@ -265,7 +271,6 @@ dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
do_error_trap(regs, error_code, str, trapnr, signr, sicode, addr); \
}
DO_ERROR(X86_TRAP_NP, SIGBUS, 0, NULL, "segment not present", segment_not_present)
DO_ERROR(X86_TRAP_SS, SIGBUS, 0, NULL, "stack segment", stack_segment)
#undef IP

2
arch/x86/xen/enlighten_pv.c
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@ -628,7 +628,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY(exc_device_not_available, false ),
TRAP_ENTRY(exc_coproc_segment_overrun, false ),
TRAP_ENTRY(exc_invalid_tss, false ),
{ segment_not_present, xen_segment_not_present, false },
TRAP_ENTRY(exc_segment_not_present, false ),
{ stack_segment, xen_stack_segment, false },
{ general_protection, xen_general_protection, false },
{ spurious_interrupt_bug, xen_spurious_interrupt_bug, false },

2
arch/x86/xen/xen-asm_64.S
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@ -40,7 +40,7 @@ xen_pv_trap asm_exc_device_not_available
xen_pv_trap double_fault
xen_pv_trap asm_exc_coproc_segment_overrun
xen_pv_trap asm_exc_invalid_tss
xen_pv_trap segment_not_present
xen_pv_trap asm_exc_segment_not_present
xen_pv_trap stack_segment
xen_pv_trap general_protection
xen_pv_trap page_fault