1/* 2 * hppa linux kernel vdso replacement. 3 * 4 * Copyright 2023 Linaro, Ltd. 5 * 6 * SPDX-License-Identifier: GPL-2.0-or-later 7 */ 8 9#include <asm/unistd.h> 10#include "vdso-asmoffset.h" 11 12 .text 13 14 15/* 16 * arch/parisc/kernel/vdso32/sigtramp.S: 17 * Gdb expects the trampoline is on the stack and the pc is offset from 18 * a 64-byte boundary by 0, 4 or 5 instructions. Since the vdso trampoline 19 * is not on the stack, we need a new variant with different offsets and 20 * data to tell gdb where to find the signal context on the stack. 21 * 22 * Here we put the offset to the context data at the start of the trampoline 23 * region and offset the first trampoline by 2 instructions. Please do 24 * not change the trampoline as the code in gdb depends on the following 25 * instruction sequence exactly. 26 */ 27 28/* arch/parisc/kernel/asm-offsets.c */ 29#define SIGFRAME_CONTEXT_REGS32 \ 30 (offsetof_sigcontext - PARISC_RT_SIGFRAME_SIZE32) 31 32 .align 64 33 .word SIGFRAME_CONTEXT_REGS32 34 35/* 36 * All that said, we can provide a proper unwind record, which means that 37 * GDB should not actually need the offset magic. 38 * 39 * The return address that arrived here, from the inner frame, is 40 * not marked as a signal frame and so the unwinder still tries to 41 * subtract 1 to examine the presumed call insn. Thus we must 42 * extend the unwind info to a nop before the start. 43 */ 44 45 .cfi_startproc simple 46 .cfi_signal_frame 47 48 /* Compare pa32_fallback_frame_state from libgcc. */ 49 50 /* 51 * Place the CFA at the start of sigcontext for convenience. 52 * The previous CFA will be restored from the saved stack pointer. 53 */ 54 .cfi_def_cfa 30, -PARISC_RT_SIGFRAME_SIZE32 + offsetof_sigcontext 55 56 /* Record save offset of general registers. */ 57 .cfi_offset 1, offsetof_sigcontext_gr + 1 * 4 58 .cfi_offset 2, offsetof_sigcontext_gr + 2 * 4 59 .cfi_offset 3, offsetof_sigcontext_gr + 3 * 4 60 .cfi_offset 4, offsetof_sigcontext_gr + 4 * 4 61 .cfi_offset 5, offsetof_sigcontext_gr + 5 * 4 62 .cfi_offset 6, offsetof_sigcontext_gr + 6 * 4 63 .cfi_offset 7, offsetof_sigcontext_gr + 7 * 4 64 .cfi_offset 8, offsetof_sigcontext_gr + 8 * 4 65 .cfi_offset 9, offsetof_sigcontext_gr + 9 * 4 66 .cfi_offset 10, offsetof_sigcontext_gr + 10 * 4 67 .cfi_offset 11, offsetof_sigcontext_gr + 11 * 4 68 .cfi_offset 12, offsetof_sigcontext_gr + 12 * 4 69 .cfi_offset 13, offsetof_sigcontext_gr + 13 * 4 70 .cfi_offset 14, offsetof_sigcontext_gr + 14 * 4 71 .cfi_offset 15, offsetof_sigcontext_gr + 15 * 4 72 .cfi_offset 16, offsetof_sigcontext_gr + 16 * 4 73 .cfi_offset 17, offsetof_sigcontext_gr + 17 * 4 74 .cfi_offset 18, offsetof_sigcontext_gr + 18 * 4 75 .cfi_offset 19, offsetof_sigcontext_gr + 19 * 4 76 .cfi_offset 20, offsetof_sigcontext_gr + 20 * 4 77 .cfi_offset 21, offsetof_sigcontext_gr + 21 * 4 78 .cfi_offset 22, offsetof_sigcontext_gr + 22 * 4 79 .cfi_offset 23, offsetof_sigcontext_gr + 23 * 4 80 .cfi_offset 24, offsetof_sigcontext_gr + 24 * 4 81 .cfi_offset 25, offsetof_sigcontext_gr + 25 * 4 82 .cfi_offset 26, offsetof_sigcontext_gr + 26 * 4 83 .cfi_offset 27, offsetof_sigcontext_gr + 27 * 4 84 .cfi_offset 28, offsetof_sigcontext_gr + 28 * 4 85 .cfi_offset 29, offsetof_sigcontext_gr + 29 * 4 86 .cfi_offset 30, offsetof_sigcontext_gr + 30 * 4 87 .cfi_offset 31, offsetof_sigcontext_gr + 31 * 4 88 89 /* Record save offset of fp registers, left and right halves. */ 90 .cfi_offset 32, offsetof_sigcontext_fr + 4 * 8 91 .cfi_offset 33, offsetof_sigcontext_fr + 4 * 8 + 4 92 .cfi_offset 34, offsetof_sigcontext_fr + 5 * 8 93 .cfi_offset 35, offsetof_sigcontext_fr + 5 * 8 + 4 94 .cfi_offset 36, offsetof_sigcontext_fr + 6 * 8 95 .cfi_offset 37, offsetof_sigcontext_fr + 6 * 8 + 4 96 .cfi_offset 38, offsetof_sigcontext_fr + 7 * 8 97 .cfi_offset 39, offsetof_sigcontext_fr + 7 * 8 + 4 98 .cfi_offset 40, offsetof_sigcontext_fr + 8 * 8 99 .cfi_offset 41, offsetof_sigcontext_fr + 8 * 8 + 4 100 .cfi_offset 42, offsetof_sigcontext_fr + 9 * 8 101 .cfi_offset 43, offsetof_sigcontext_fr + 9 * 8 + 4 102 .cfi_offset 44, offsetof_sigcontext_fr + 10 * 8 103 .cfi_offset 45, offsetof_sigcontext_fr + 10 * 8 + 4 104 .cfi_offset 46, offsetof_sigcontext_fr + 11 * 8 105 .cfi_offset 47, offsetof_sigcontext_fr + 11 * 8 + 4 106 .cfi_offset 48, offsetof_sigcontext_fr + 12 * 8 107 .cfi_offset 49, offsetof_sigcontext_fr + 12 * 8 + 4 108 .cfi_offset 50, offsetof_sigcontext_fr + 13 * 8 109 .cfi_offset 51, offsetof_sigcontext_fr + 13 * 8 + 4 110 .cfi_offset 52, offsetof_sigcontext_fr + 14 * 8 111 .cfi_offset 53, offsetof_sigcontext_fr + 14 * 8 + 4 112 .cfi_offset 54, offsetof_sigcontext_fr + 15 * 8 113 .cfi_offset 55, offsetof_sigcontext_fr + 15 * 8 + 4 114 .cfi_offset 56, offsetof_sigcontext_fr + 16 * 8 115 .cfi_offset 57, offsetof_sigcontext_fr + 16 * 8 + 4 116 .cfi_offset 58, offsetof_sigcontext_fr + 17 * 8 117 .cfi_offset 59, offsetof_sigcontext_fr + 17 * 8 + 4 118 .cfi_offset 60, offsetof_sigcontext_fr + 18 * 8 119 .cfi_offset 61, offsetof_sigcontext_fr + 18 * 8 + 4 120 .cfi_offset 62, offsetof_sigcontext_fr + 19 * 8 121 .cfi_offset 63, offsetof_sigcontext_fr + 19 * 8 + 4 122 .cfi_offset 64, offsetof_sigcontext_fr + 20 * 8 123 .cfi_offset 65, offsetof_sigcontext_fr + 20 * 8 + 4 124 .cfi_offset 66, offsetof_sigcontext_fr + 21 * 8 125 .cfi_offset 67, offsetof_sigcontext_fr + 21 * 8 + 4 126 .cfi_offset 68, offsetof_sigcontext_fr + 22 * 8 127 .cfi_offset 69, offsetof_sigcontext_fr + 22 * 8 + 4 128 .cfi_offset 70, offsetof_sigcontext_fr + 23 * 8 129 .cfi_offset 71, offsetof_sigcontext_fr + 23 * 8 + 4 130 .cfi_offset 72, offsetof_sigcontext_fr + 24 * 8 131 .cfi_offset 73, offsetof_sigcontext_fr + 24 * 8 + 4 132 .cfi_offset 74, offsetof_sigcontext_fr + 25 * 8 133 .cfi_offset 75, offsetof_sigcontext_fr + 25 * 8 + 4 134 .cfi_offset 76, offsetof_sigcontext_fr + 26 * 8 135 .cfi_offset 77, offsetof_sigcontext_fr + 26 * 8 + 4 136 .cfi_offset 78, offsetof_sigcontext_fr + 27 * 8 137 .cfi_offset 79, offsetof_sigcontext_fr + 27 * 8 + 4 138 .cfi_offset 80, offsetof_sigcontext_fr + 28 * 8 139 .cfi_offset 81, offsetof_sigcontext_fr + 28 * 8 + 4 140 .cfi_offset 82, offsetof_sigcontext_fr + 29 * 8 141 .cfi_offset 83, offsetof_sigcontext_fr + 29 * 8 + 4 142 .cfi_offset 84, offsetof_sigcontext_fr + 30 * 8 143 .cfi_offset 85, offsetof_sigcontext_fr + 30 * 8 + 4 144 .cfi_offset 86, offsetof_sigcontext_fr + 31 * 8 145 .cfi_offset 87, offsetof_sigcontext_fr + 31 * 8 + 4 146 147 /* Record save offset of %sar */ 148 .cfi_offset 88, offsetof_sigcontext_sar 149 150 /* Record save offset of return address, iaoq[0]. */ 151 .cfi_return_column 89 152 .cfi_offset 89, offsetof_sigcontext_iaoq 153 154 nop 155 156__kernel_sigtramp_rt: 157 ldi 0, %r25 158 ldi __NR_rt_sigreturn, %r20 159 be,l 0x100(%sr2, %r0), %sr0, %r31 160 nop 161 162 .cfi_endproc 163 .size __kernel_sigtramp_rt, . - __kernel_sigtramp_rt 164 .type __kernel_sigtramp_rt, @function 165 .globl __kernel_sigtramp_rt 166