Commit 8ed3a542 authored by Max Filippov's avatar Max Filippov
Browse files

xtensa: drop fast_syscall_kernel 



There must be no xtensa-specific syscalls from the kernel code: register
spilling uses call+entry sequence and atomics have proper function
implementations. Drop fast_syscall_xtensa.

Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent 5eacadb5

arch/xtensa/kernel/entry.S

+0 −19
Original line number Diff line number Diff line
@@ -1022,25 +1022,6 @@ ENDPROC(fast_alloca) 
 *   excsave_1:	dispatch table

 */



ENTRY(fast_syscall_kernel)



	/* Skip syscall. */



	rsr	a0, epc1

	addi	a0, a0, 3

	wsr	a0, epc1



	l32i	a0, a2, PT_DEPC

	bgeui	a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable



	rsr	a0, depc			# get syscall-nr

	_beqz	a0, fast_syscall_spill_registers

	_beqi	a0, __NR_xtensa, fast_syscall_xtensa



	j	kernel_exception



ENDPROC(fast_syscall_kernel)



ENTRY(fast_syscall_user)



	/* Skip syscall. */

arch/xtensa/kernel/traps.c

+0 −2
Original line number Diff line number Diff line
@@ -51,7 +51,6 @@ 
extern void kernel_exception(void);

extern void user_exception(void);



extern void fast_syscall_kernel(void);

extern void fast_syscall_user(void);

extern void fast_alloca(void);

extern void fast_unaligned(void);
@@ -89,7 +88,6 @@ typedef struct { 
static dispatch_init_table_t __initdata dispatch_init_table[] = {



{ EXCCAUSE_ILLEGAL_INSTRUCTION,	0,	   do_illegal_instruction},

{ EXCCAUSE_SYSTEM_CALL,		KRNL,	   fast_syscall_kernel },

{ EXCCAUSE_SYSTEM_CALL,		USER,	   fast_syscall_user },

{ EXCCAUSE_SYSTEM_CALL,		0,	   system_call },

/* EXCCAUSE_INSTRUCTION_FETCH unhandled */

CRA Git | Maintained and supported by SUSTech CRA and CCSE