1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 /* 4 * Preserved registers that are shared between code in ivt.S and 5 * entry.S. Be careful not to step on these! 6 */ 7 #define PRED_LEAVE_SYSCALL 1 /* TRUE iff leave from syscall */ 8 #define PRED_KERNEL_STACK 2 /* returning to kernel-stacks? */ 9 #define PRED_USER_STACK 3 /* returning to user-stacks? */ 10 #define PRED_SYSCALL 4 /* inside a system call? */ 11 #define PRED_NON_SYSCALL 5 /* complement of PRED_SYSCALL */ 12 13 #ifdef __ASSEMBLY__ 14 # define PASTE2(x,y) x##y 15 # define PASTE(x,y) PASTE2(x,y) 16 17 # define pLvSys PASTE(p,PRED_LEAVE_SYSCALL) 18 # define pKStk PASTE(p,PRED_KERNEL_STACK) 19 # define pUStk PASTE(p,PRED_USER_STACK) 20 # define pSys PASTE(p,PRED_SYSCALL) 21 # define pNonSys PASTE(p,PRED_NON_SYSCALL) 22 #endif 23 24 #define PT(f) (IA64_PT_REGS_##f##_OFFSET) 25 #define SW(f) (IA64_SWITCH_STACK_##f##_OFFSET) 26 #define SOS(f) (IA64_SAL_OS_STATE_##f##_OFFSET) 27 28 #define PT_REGS_SAVES(off) \ 29 .unwabi 3, 'i'; \ 30 .fframe IA64_PT_REGS_SIZE+16+(off); \ 31 .spillsp rp, PT(CR_IIP)+16+(off); \ 32 .spillsp ar.pfs, PT(CR_IFS)+16+(off); \ 33 .spillsp ar.unat, PT(AR_UNAT)+16+(off); \ 34 .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \ 35 .spillsp pr, PT(PR)+16+(off); 36 37 #define PT_REGS_UNWIND_INFO(off) \ 38 .prologue; \ 39 PT_REGS_SAVES(off); \ 40 .body 41 42 #define SWITCH_STACK_SAVES(off) \ 43 .savesp ar.unat,SW(CALLER_UNAT)+16+(off); \ 44 .savesp ar.fpsr,SW(AR_FPSR)+16+(off); \ 45 .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off); \ 46 .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off); \ 47 .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off); \ 48 .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off); \ 49 .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off); \ 50 .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off); \ 51 .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off); \ 52 .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off); \ 53 .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off); \ 54 .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off); \ 55 .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off); \ 56 .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off); \ 57 .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off); \ 58 .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off); \ 59 .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off); \ 60 .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \ 61 .spillsp @priunat,SW(AR_UNAT)+16+(off); \ 62 .spillsp ar.rnat,SW(AR_RNAT)+16+(off); \ 63 .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off); \ 64 .spillsp pr,SW(PR)+16+(off) 65 66 #define DO_SAVE_SWITCH_STACK \ 67 movl r28=1f; \ 68 ;; \ 69 .fframe IA64_SWITCH_STACK_SIZE; \ 70 adds sp=-IA64_SWITCH_STACK_SIZE,sp; \ 71 mov.ret.sptk b7=r28,1f; \ 72 SWITCH_STACK_SAVES(0); \ 73 br.cond.sptk.many save_switch_stack; \ 74 1: 75 76 #define DO_LOAD_SWITCH_STACK \ 77 movl r28=1f; \ 78 ;; \ 79 invala; \ 80 mov.ret.sptk b7=r28,1f; \ 81 br.cond.sptk.many load_switch_stack; \ 82 1: .restore sp; \ 83 adds sp=IA64_SWITCH_STACK_SIZE,sp 84