166 lines
6.4 KiB
ArmAsm
166 lines
6.4 KiB
ArmAsm
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/*
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* hppa linux kernel vdso replacement.
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*
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* Copyright 2023 Linaro, Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <asm/unistd.h>
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#include "vdso-asmoffset.h"
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.text
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/*
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* arch/parisc/kernel/vdso32/sigtramp.S:
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* Gdb expects the trampoline is on the stack and the pc is offset from
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* a 64-byte boundary by 0, 4 or 5 instructions. Since the vdso trampoline
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* is not on the stack, we need a new variant with different offsets and
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* data to tell gdb where to find the signal context on the stack.
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*
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* Here we put the offset to the context data at the start of the trampoline
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* region and offset the first trampoline by 2 instructions. Please do
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* not change the trampoline as the code in gdb depends on the following
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* instruction sequence exactly.
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*/
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/* arch/parisc/kernel/asm-offsets.c */
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#define SIGFRAME_CONTEXT_REGS32 \
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(offsetof_sigcontext - PARISC_RT_SIGFRAME_SIZE32)
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.align 64
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.word SIGFRAME_CONTEXT_REGS32
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/*
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* All that said, we can provide a proper unwind record, which means that
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* GDB should not actually need the offset magic.
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*
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* The return address that arrived here, from the inner frame, is
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* not marked as a signal frame and so the unwinder still tries to
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* subtract 1 to examine the presumed call insn. Thus we must
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* extend the unwind info to a nop before the start.
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*/
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.cfi_startproc simple
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.cfi_signal_frame
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/* Compare pa32_fallback_frame_state from libgcc. */
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/*
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* Place the CFA at the start of sigcontext for convenience.
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* The previous CFA will be restored from the saved stack pointer.
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*/
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.cfi_def_cfa 30, -PARISC_RT_SIGFRAME_SIZE32 + offsetof_sigcontext
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/* Record save offset of general registers. */
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.cfi_offset 1, offsetof_sigcontext_gr + 1 * 4
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.cfi_offset 2, offsetof_sigcontext_gr + 2 * 4
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.cfi_offset 3, offsetof_sigcontext_gr + 3 * 4
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.cfi_offset 4, offsetof_sigcontext_gr + 4 * 4
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.cfi_offset 5, offsetof_sigcontext_gr + 5 * 4
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.cfi_offset 6, offsetof_sigcontext_gr + 6 * 4
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.cfi_offset 7, offsetof_sigcontext_gr + 7 * 4
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.cfi_offset 8, offsetof_sigcontext_gr + 8 * 4
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.cfi_offset 9, offsetof_sigcontext_gr + 9 * 4
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.cfi_offset 10, offsetof_sigcontext_gr + 10 * 4
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.cfi_offset 11, offsetof_sigcontext_gr + 11 * 4
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.cfi_offset 12, offsetof_sigcontext_gr + 12 * 4
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.cfi_offset 13, offsetof_sigcontext_gr + 13 * 4
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.cfi_offset 14, offsetof_sigcontext_gr + 14 * 4
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.cfi_offset 15, offsetof_sigcontext_gr + 15 * 4
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.cfi_offset 16, offsetof_sigcontext_gr + 16 * 4
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.cfi_offset 17, offsetof_sigcontext_gr + 17 * 4
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.cfi_offset 18, offsetof_sigcontext_gr + 18 * 4
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.cfi_offset 19, offsetof_sigcontext_gr + 19 * 4
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.cfi_offset 20, offsetof_sigcontext_gr + 20 * 4
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.cfi_offset 21, offsetof_sigcontext_gr + 21 * 4
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.cfi_offset 22, offsetof_sigcontext_gr + 22 * 4
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.cfi_offset 23, offsetof_sigcontext_gr + 23 * 4
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.cfi_offset 24, offsetof_sigcontext_gr + 24 * 4
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.cfi_offset 25, offsetof_sigcontext_gr + 25 * 4
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.cfi_offset 26, offsetof_sigcontext_gr + 26 * 4
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.cfi_offset 27, offsetof_sigcontext_gr + 27 * 4
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.cfi_offset 28, offsetof_sigcontext_gr + 28 * 4
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.cfi_offset 29, offsetof_sigcontext_gr + 29 * 4
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.cfi_offset 30, offsetof_sigcontext_gr + 30 * 4
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.cfi_offset 31, offsetof_sigcontext_gr + 31 * 4
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/* Record save offset of fp registers, left and right halves. */
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.cfi_offset 32, offsetof_sigcontext_fr + 4 * 8
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.cfi_offset 33, offsetof_sigcontext_fr + 4 * 8 + 4
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.cfi_offset 34, offsetof_sigcontext_fr + 5 * 8
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.cfi_offset 35, offsetof_sigcontext_fr + 5 * 8 + 4
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.cfi_offset 36, offsetof_sigcontext_fr + 6 * 8
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.cfi_offset 37, offsetof_sigcontext_fr + 6 * 8 + 4
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.cfi_offset 38, offsetof_sigcontext_fr + 7 * 8
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.cfi_offset 39, offsetof_sigcontext_fr + 7 * 8 + 4
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.cfi_offset 40, offsetof_sigcontext_fr + 8 * 8
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.cfi_offset 41, offsetof_sigcontext_fr + 8 * 8 + 4
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.cfi_offset 42, offsetof_sigcontext_fr + 9 * 8
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.cfi_offset 43, offsetof_sigcontext_fr + 9 * 8 + 4
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.cfi_offset 44, offsetof_sigcontext_fr + 10 * 8
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.cfi_offset 45, offsetof_sigcontext_fr + 10 * 8 + 4
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.cfi_offset 46, offsetof_sigcontext_fr + 11 * 8
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.cfi_offset 47, offsetof_sigcontext_fr + 11 * 8 + 4
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.cfi_offset 48, offsetof_sigcontext_fr + 12 * 8
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.cfi_offset 49, offsetof_sigcontext_fr + 12 * 8 + 4
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.cfi_offset 50, offsetof_sigcontext_fr + 13 * 8
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.cfi_offset 51, offsetof_sigcontext_fr + 13 * 8 + 4
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.cfi_offset 52, offsetof_sigcontext_fr + 14 * 8
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.cfi_offset 53, offsetof_sigcontext_fr + 14 * 8 + 4
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.cfi_offset 54, offsetof_sigcontext_fr + 15 * 8
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.cfi_offset 55, offsetof_sigcontext_fr + 15 * 8 + 4
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.cfi_offset 56, offsetof_sigcontext_fr + 16 * 8
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.cfi_offset 57, offsetof_sigcontext_fr + 16 * 8 + 4
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.cfi_offset 58, offsetof_sigcontext_fr + 17 * 8
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.cfi_offset 59, offsetof_sigcontext_fr + 17 * 8 + 4
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.cfi_offset 60, offsetof_sigcontext_fr + 18 * 8
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.cfi_offset 61, offsetof_sigcontext_fr + 18 * 8 + 4
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.cfi_offset 62, offsetof_sigcontext_fr + 19 * 8
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.cfi_offset 63, offsetof_sigcontext_fr + 19 * 8 + 4
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.cfi_offset 64, offsetof_sigcontext_fr + 20 * 8
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.cfi_offset 65, offsetof_sigcontext_fr + 20 * 8 + 4
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.cfi_offset 66, offsetof_sigcontext_fr + 21 * 8
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.cfi_offset 67, offsetof_sigcontext_fr + 21 * 8 + 4
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.cfi_offset 68, offsetof_sigcontext_fr + 22 * 8
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.cfi_offset 69, offsetof_sigcontext_fr + 22 * 8 + 4
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.cfi_offset 70, offsetof_sigcontext_fr + 23 * 8
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.cfi_offset 71, offsetof_sigcontext_fr + 23 * 8 + 4
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.cfi_offset 72, offsetof_sigcontext_fr + 24 * 8
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.cfi_offset 73, offsetof_sigcontext_fr + 24 * 8 + 4
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.cfi_offset 74, offsetof_sigcontext_fr + 25 * 8
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.cfi_offset 75, offsetof_sigcontext_fr + 25 * 8 + 4
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.cfi_offset 76, offsetof_sigcontext_fr + 26 * 8
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.cfi_offset 77, offsetof_sigcontext_fr + 26 * 8 + 4
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.cfi_offset 78, offsetof_sigcontext_fr + 27 * 8
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.cfi_offset 79, offsetof_sigcontext_fr + 27 * 8 + 4
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.cfi_offset 80, offsetof_sigcontext_fr + 28 * 8
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.cfi_offset 81, offsetof_sigcontext_fr + 28 * 8 + 4
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.cfi_offset 82, offsetof_sigcontext_fr + 29 * 8
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.cfi_offset 83, offsetof_sigcontext_fr + 29 * 8 + 4
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.cfi_offset 84, offsetof_sigcontext_fr + 30 * 8
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.cfi_offset 85, offsetof_sigcontext_fr + 30 * 8 + 4
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.cfi_offset 86, offsetof_sigcontext_fr + 31 * 8
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.cfi_offset 87, offsetof_sigcontext_fr + 31 * 8 + 4
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/* Record save offset of %sar */
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.cfi_offset 88, offsetof_sigcontext_sar
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/* Record save offset of return address, iaoq[0]. */
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.cfi_return_column 89
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.cfi_offset 89, offsetof_sigcontext_iaoq
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nop
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__kernel_sigtramp_rt:
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ldi 0, %r25
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ldi __NR_rt_sigreturn, %r20
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be,l 0x100(%sr2, %r0), %sr0, %r31
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nop
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.cfi_endproc
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.size __kernel_sigtramp_rt, . - __kernel_sigtramp_rt
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.type __kernel_sigtramp_rt, @function
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.globl __kernel_sigtramp_rt
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