korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-19 10:14:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

x86/entry: Convert General protection exception to IDTENTRY

Browse Source 
Convert #GP 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
  - Remove the RCU warning as the new entry macro ensures correctness

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505134905.637269946@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:16:25 +01:00
parent fd9689bf91
commit be4c11afbb
8 changed files with 9 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/entry/entry_32.S
View File

@ -1302,7 +1302,7 @@ SYM_CODE_START(simd_coprocessor_error)
pushl $0
#ifdef CONFIG_X86_INVD_BUG
/* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */
ALTERNATIVE "pushl $do_general_protection", \
ALTERNATIVE "pushl $exc_general_protection", \
"pushl $do_simd_coprocessor_error", \
X86_FEATURE_XMM
#else
@ -1690,12 +1690,6 @@ SYM_CODE_START(int3)
jmp common_exception
SYM_CODE_END(int3)
SYM_CODE_START(general_protection)
ASM_CLAC
pushl $do_general_protection
jmp common_exception
SYM_CODE_END(general_protection)
.pushsection .text, "ax"
SYM_CODE_START(rewind_stack_do_exit)
/* Prevent any naive code from trying to unwind to our caller. */

3
arch/x86/entry/entry_64.S
View File

@ -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_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
idtentry X86_TRAP_MF coprocessor_error do_coprocessor_error has_error_code=0
idtentry X86_TRAP_AC alignment_check do_alignment_check has_error_code=1
@ -1209,7 +1208,7 @@ SYM_CODE_START(xen_failsafe_callback)
addq $0x30, %rsp
pushq $0 /* RIP */
UNWIND_HINT_IRET_REGS offset=8
jmp general_protection
jmp asm_exc_general_protection
1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */
movq (%rsp), %rcx
movq 8(%rsp), %r11

1
arch/x86/include/asm/idtentry.h
View File

@ -134,5 +134,6 @@ DECLARE_IDTENTRY(X86_TRAP_OLD_MF, exc_coproc_segment_overrun);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_NP, exc_segment_not_present);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_SS, exc_stack_segment);
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_GP, exc_general_protection);
#endif

3
arch/x86/include/asm/traps.h
View File

@ -17,7 +17,6 @@ asmlinkage void int3(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
#endif
asmlinkage void general_protection(void);
asmlinkage void page_fault(void);
asmlinkage void async_page_fault(void);
asmlinkage void spurious_interrupt_bug(void);
@ -33,7 +32,6 @@ asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
asmlinkage void xen_double_fault(void);
asmlinkage void xen_general_protection(void);
asmlinkage void xen_page_fault(void);
asmlinkage void xen_spurious_interrupt_bug(void);
asmlinkage void xen_coprocessor_error(void);
@ -48,7 +46,6 @@ 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_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);
dotraplinkage void do_spurious_interrupt_bug(struct pt_regs *regs, long error_code);
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code);

2
arch/x86/kernel/idt.c
View File

@ -82,7 +82,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_TS, asm_exc_invalid_tss),
INTG(X86_TRAP_NP, asm_exc_segment_not_present),
INTG(X86_TRAP_SS, asm_exc_stack_segment),
INTG(X86_TRAP_GP, general_protection),
INTG(X86_TRAP_GP, asm_exc_general_protection),
INTG(X86_TRAP_SPURIOUS, spurious_interrupt_bug),
INTG(X86_TRAP_MF, coprocessor_error),
INTG(X86_TRAP_AC, alignment_check),

8
arch/x86/kernel/traps.c
View File

@ -145,7 +145,7 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, const char *str,
* process no chance to handle the signal and notice the
* kernel fault information, so that won't result in polluting
* the information about previously queued, but not yet
* delivered, faults. See also do_general_protection below.
* delivered, faults. See also exc_general_protection below.
*/
tsk->thread.error_code = error_code;
tsk->thread.trap_nr = trapnr;
@ -375,7 +375,7 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsign
* which is what the stub expects, given that the faulting
* RIP will be the IRET instruction.
*/
regs->ip = (unsigned long)general_protection;
regs->ip = (unsigned long)asm_exc_general_protection;
regs->sp = (unsigned long)&gpregs->orig_ax;
return;
@ -494,7 +494,7 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
#define GPFSTR "general protection fault"
dotraplinkage void do_general_protection(struct pt_regs *regs, long error_code)
DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
{
char desc[sizeof(GPFSTR) + 50 + 2*sizeof(unsigned long) + 1] = GPFSTR;
enum kernel_gp_hint hint = GP_NO_HINT;
@ -502,7 +502,6 @@ dotraplinkage void do_general_protection(struct pt_regs *regs, long error_code)
unsigned long gp_addr;
int ret;
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
cond_local_irq_enable(regs);
if (static_cpu_has(X86_FEATURE_UMIP)) {
@ -570,7 +569,6 @@ dotraplinkage void do_general_protection(struct pt_regs *regs, long error_code)
exit:
cond_local_irq_disable(regs);
}
NOKPROBE_SYMBOL(do_general_protection);
dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)
{

2
arch/x86/xen/enlighten_pv.c
View File

@ -630,7 +630,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY(exc_invalid_tss, false ),
TRAP_ENTRY(exc_segment_not_present, false ),
TRAP_ENTRY(exc_stack_segment, false ),
{ general_protection, xen_general_protection, false },
TRAP_ENTRY(exc_general_protection, false ),
{ spurious_interrupt_bug, xen_spurious_interrupt_bug, false },
{ coprocessor_error, xen_coprocessor_error, false },
{ alignment_check, xen_alignment_check, false },

2
arch/x86/xen/xen-asm_64.S
View File

@ -42,7 +42,7 @@ xen_pv_trap asm_exc_coproc_segment_overrun
xen_pv_trap asm_exc_invalid_tss
xen_pv_trap asm_exc_segment_not_present
xen_pv_trap asm_exc_stack_segment
xen_pv_trap general_protection
xen_pv_trap asm_exc_general_protection
xen_pv_trap page_fault
xen_pv_trap spurious_interrupt_bug
xen_pv_trap coprocessor_error