1/* SPDX-License-Identifier: GPL-2.0 */ 2 3#include <linux/export.h> 4#include <linux/linkage.h> 5#include <asm/asm-offsets.h> 6#include <asm/nospec-insn.h> 7 8#define R2_OFF 0 9#define R5_OFF (R2_OFF + (5 - 2 + 1) * 8) 10#define R14_OFF (R5_OFF + 8) 11#define RETADDR_OFF (R14_OFF + 8) 12#define R15_OFF (RETADDR_OFF + 8) 13#define BACKCHAIN_OFF (R15_OFF + 8) 14#define FRAME_SIZE (BACKCHAIN_OFF + 8) 15#define FRAME_OFF (STACK_FRAME_OVERHEAD - FRAME_SIZE) 16#if (FRAME_OFF + BACKCHAIN_OFF) != __SF_BACKCHAIN 17#error Stack frame layout calculation is broken 18#endif 19 20 GEN_BR_THUNK %r1 21 22SYM_FUNC_START(arch_bpf_timed_may_goto) 23 /* 24 * This function has a special ABI: the parameters are in %r12 and 25 * %r13; the return value is in %r12; all GPRs except %r0, %r1, and 26 * %r12 are callee-saved; and the return address is in %r0. 27 */ 28 stmg %r2,%r5,FRAME_OFF+R2_OFF(%r15) 29 stg %r14,FRAME_OFF+R14_OFF(%r15) 30 stg %r0,FRAME_OFF+RETADDR_OFF(%r15) 31 stg %r15,FRAME_OFF+R15_OFF(%r15) 32 lgr %r1,%r15 33 lay %r15,-FRAME_SIZE(%r15) 34 stg %r1,__SF_BACKCHAIN(%r15) 35 36 lay %r2,0(%r12,%r13) 37 brasl %r14,bpf_check_timed_may_goto 38 lgr %r12,%r2 39 40 lg %r15,FRAME_SIZE+FRAME_OFF+R15_OFF(%r15) 41 lmg %r2,%r5,FRAME_OFF+R2_OFF(%r15) 42 lg %r14,FRAME_OFF+R14_OFF(%r15) 43 lg %r1,FRAME_OFF+RETADDR_OFF(%r15) 44 BR_EX %r1 45SYM_FUNC_END(arch_bpf_timed_may_goto) 46