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Commit 80a3e394 authored by Andi Kleen's avatar Andi Kleen Committed by Thomas Gleixner
Browse files

x86/extable: Mark exception handler functions visible 



Mark the C exception handler functions that are directly called through
exception tables visible. LTO needs to know they are accessed from assembler.

[ tglx: Mopped up the wrecked argument alignment. Sigh.... ]

Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20171222001821.2157-6-andi@firstfloor.org
parent 7cf1aaa2

arch/x86/mm/extable.c

+17 −17
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ ex_fixup_handler(const struct exception_table_entry *x) 
	return (ex_handler_t)((unsigned long)&x->handler + x->handler);

}



bool ex_handler_default(const struct exception_table_entry *fixup,

__visible bool ex_handler_default(const struct exception_table_entry *fixup,

				  struct pt_regs *regs, int trapnr)

{

	regs->ip = ex_fixup_addr(fixup);
@@ -29,7 +29,7 @@ bool ex_handler_default(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL(ex_handler_default);



bool ex_handler_fault(const struct exception_table_entry *fixup,

__visible bool ex_handler_fault(const struct exception_table_entry *fixup,

				struct pt_regs *regs, int trapnr)

{

	regs->ip = ex_fixup_addr(fixup);
@@ -42,7 +42,7 @@ EXPORT_SYMBOL_GPL(ex_handler_fault); 
 * Handler for UD0 exception following a failed test against the

 * result of a refcount inc/dec/add/sub.

 */

bool ex_handler_refcount(const struct exception_table_entry *fixup,

__visible bool ex_handler_refcount(const struct exception_table_entry *fixup,

				   struct pt_regs *regs, int trapnr)

{

	/* First unconditionally saturate the refcount. */
@@ -95,7 +95,7 @@ EXPORT_SYMBOL(ex_handler_refcount); 
 * of vulnerability by restoring from the initial state (essentially, zeroing

 * out all the FPU registers) if we can't restore from the task's FPU state.

 */

bool ex_handler_fprestore(const struct exception_table_entry *fixup,

__visible bool ex_handler_fprestore(const struct exception_table_entry *fixup,

				    struct pt_regs *regs, int trapnr)

{

	regs->ip = ex_fixup_addr(fixup);
@@ -108,7 +108,7 @@ bool ex_handler_fprestore(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL_GPL(ex_handler_fprestore);



bool ex_handler_ext(const struct exception_table_entry *fixup,

__visible bool ex_handler_ext(const struct exception_table_entry *fixup,

			      struct pt_regs *regs, int trapnr)

{

	/* Special hack for uaccess_err */
@@ -118,7 +118,7 @@ bool ex_handler_ext(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL(ex_handler_ext);



bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup,

__visible bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup,

				       struct pt_regs *regs, int trapnr)

{

	if (pr_warn_once("unchecked MSR access error: RDMSR from 0x%x at rIP: 0x%lx (%pF)\n",
@@ -133,7 +133,7 @@ bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL(ex_handler_rdmsr_unsafe);



bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup,

__visible bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup,

				       struct pt_regs *regs, int trapnr)

{

	if (pr_warn_once("unchecked MSR access error: WRMSR to 0x%x (tried to write 0x%08x%08x) at rIP: 0x%lx (%pF)\n",
@@ -147,7 +147,7 @@ bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL(ex_handler_wrmsr_unsafe);



bool ex_handler_clear_fs(const struct exception_table_entry *fixup,

__visible bool ex_handler_clear_fs(const struct exception_table_entry *fixup,

				   struct pt_regs *regs, int trapnr)

{

	if (static_cpu_has(X86_BUG_NULL_SEG))
@@ -157,7 +157,7 @@ bool ex_handler_clear_fs(const struct exception_table_entry *fixup, 
}

EXPORT_SYMBOL(ex_handler_clear_fs);



bool ex_has_fault_handler(unsigned long ip)

__visible bool ex_has_fault_handler(unsigned long ip)

{

	const struct exception_table_entry *e;

	ex_handler_t handler;