diff options
Diffstat (limited to 'linux-user/hppa/vdso.S')
| -rw-r--r-- | linux-user/hppa/vdso.S | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/linux-user/hppa/vdso.S b/linux-user/hppa/vdso.S new file mode 100644 index 0000000000..5be14d2f70 --- /dev/null +++ b/linux-user/hppa/vdso.S @@ -0,0 +1,165 @@ +/* + * hppa linux kernel vdso replacement. + * + * Copyright 2023 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <asm/unistd.h> +#include "vdso-asmoffset.h" + + .text + + +/* + * arch/parisc/kernel/vdso32/sigtramp.S: + * Gdb expects the trampoline is on the stack and the pc is offset from + * a 64-byte boundary by 0, 4 or 5 instructions. Since the vdso trampoline + * is not on the stack, we need a new variant with different offsets and + * data to tell gdb where to find the signal context on the stack. + * + * Here we put the offset to the context data at the start of the trampoline + * region and offset the first trampoline by 2 instructions. Please do + * not change the trampoline as the code in gdb depends on the following + * instruction sequence exactly. + */ + +/* arch/parisc/kernel/asm-offsets.c */ +#define SIGFRAME_CONTEXT_REGS32 \ + (offsetof_sigcontext - PARISC_RT_SIGFRAME_SIZE32) + + .align 64 + .word SIGFRAME_CONTEXT_REGS32 + +/* + * All that said, we can provide a proper unwind record, which means that + * GDB should not actually need the offset magic. + * + * The return address that arrived here, from the inner frame, is + * not marked as a signal frame and so the unwinder still tries to + * subtract 1 to examine the presumed call insn. Thus we must + * extend the unwind info to a nop before the start. + */ + + .cfi_startproc simple + .cfi_signal_frame + + /* Compare pa32_fallback_frame_state from libgcc. */ + + /* + * Place the CFA at the start of sigcontext for convenience. + * The previous CFA will be restored from the saved stack pointer. + */ + .cfi_def_cfa 30, -PARISC_RT_SIGFRAME_SIZE32 + offsetof_sigcontext + + /* Record save offset of general registers. */ + .cfi_offset 1, offsetof_sigcontext_gr + 1 * 4 + .cfi_offset 2, offsetof_sigcontext_gr + 2 * 4 + .cfi_offset 3, offsetof_sigcontext_gr + 3 * 4 + .cfi_offset 4, offsetof_sigcontext_gr + 4 * 4 + .cfi_offset 5, offsetof_sigcontext_gr + 5 * 4 + .cfi_offset 6, offsetof_sigcontext_gr + 6 * 4 + .cfi_offset 7, offsetof_sigcontext_gr + 7 * 4 + .cfi_offset 8, offsetof_sigcontext_gr + 8 * 4 + .cfi_offset 9, offsetof_sigcontext_gr + 9 * 4 + .cfi_offset 10, offsetof_sigcontext_gr + 10 * 4 + .cfi_offset 11, offsetof_sigcontext_gr + 11 * 4 + .cfi_offset 12, offsetof_sigcontext_gr + 12 * 4 + .cfi_offset 13, offsetof_sigcontext_gr + 13 * 4 + .cfi_offset 14, offsetof_sigcontext_gr + 14 * 4 + .cfi_offset 15, offsetof_sigcontext_gr + 15 * 4 + .cfi_offset 16, offsetof_sigcontext_gr + 16 * 4 + .cfi_offset 17, offsetof_sigcontext_gr + 17 * 4 + .cfi_offset 18, offsetof_sigcontext_gr + 18 * 4 + .cfi_offset 19, offsetof_sigcontext_gr + 19 * 4 + .cfi_offset 20, offsetof_sigcontext_gr + 20 * 4 + .cfi_offset 21, offsetof_sigcontext_gr + 21 * 4 + .cfi_offset 22, offsetof_sigcontext_gr + 22 * 4 + .cfi_offset 23, offsetof_sigcontext_gr + 23 * 4 + .cfi_offset 24, offsetof_sigcontext_gr + 24 * 4 + .cfi_offset 25, offsetof_sigcontext_gr + 25 * 4 + .cfi_offset 26, offsetof_sigcontext_gr + 26 * 4 + .cfi_offset 27, offsetof_sigcontext_gr + 27 * 4 + .cfi_offset 28, offsetof_sigcontext_gr + 28 * 4 + .cfi_offset 29, offsetof_sigcontext_gr + 29 * 4 + .cfi_offset 30, offsetof_sigcontext_gr + 30 * 4 + .cfi_offset 31, offsetof_sigcontext_gr + 31 * 4 + + /* Record save offset of fp registers, left and right halves. */ + .cfi_offset 32, offsetof_sigcontext_fr + 4 * 8 + .cfi_offset 33, offsetof_sigcontext_fr + 4 * 8 + 4 + .cfi_offset 34, offsetof_sigcontext_fr + 5 * 8 + .cfi_offset 35, offsetof_sigcontext_fr + 5 * 8 + 4 + .cfi_offset 36, offsetof_sigcontext_fr + 6 * 8 + .cfi_offset 37, offsetof_sigcontext_fr + 6 * 8 + 4 + .cfi_offset 38, offsetof_sigcontext_fr + 7 * 8 + .cfi_offset 39, offsetof_sigcontext_fr + 7 * 8 + 4 + .cfi_offset 40, offsetof_sigcontext_fr + 8 * 8 + .cfi_offset 41, offsetof_sigcontext_fr + 8 * 8 + 4 + .cfi_offset 42, offsetof_sigcontext_fr + 9 * 8 + .cfi_offset 43, offsetof_sigcontext_fr + 9 * 8 + 4 + .cfi_offset 44, offsetof_sigcontext_fr + 10 * 8 + .cfi_offset 45, offsetof_sigcontext_fr + 10 * 8 + 4 + .cfi_offset 46, offsetof_sigcontext_fr + 11 * 8 + .cfi_offset 47, offsetof_sigcontext_fr + 11 * 8 + 4 + .cfi_offset 48, offsetof_sigcontext_fr + 12 * 8 + .cfi_offset 49, offsetof_sigcontext_fr + 12 * 8 + 4 + .cfi_offset 50, offsetof_sigcontext_fr + 13 * 8 + .cfi_offset 51, offsetof_sigcontext_fr + 13 * 8 + 4 + .cfi_offset 52, offsetof_sigcontext_fr + 14 * 8 + .cfi_offset 53, offsetof_sigcontext_fr + 14 * 8 + 4 + .cfi_offset 54, offsetof_sigcontext_fr + 15 * 8 + .cfi_offset 55, offsetof_sigcontext_fr + 15 * 8 + 4 + .cfi_offset 56, offsetof_sigcontext_fr + 16 * 8 + .cfi_offset 57, offsetof_sigcontext_fr + 16 * 8 + 4 + .cfi_offset 58, offsetof_sigcontext_fr + 17 * 8 + .cfi_offset 59, offsetof_sigcontext_fr + 17 * 8 + 4 + .cfi_offset 60, offsetof_sigcontext_fr + 18 * 8 + .cfi_offset 61, offsetof_sigcontext_fr + 18 * 8 + 4 + .cfi_offset 62, offsetof_sigcontext_fr + 19 * 8 + .cfi_offset 63, offsetof_sigcontext_fr + 19 * 8 + 4 + .cfi_offset 64, offsetof_sigcontext_fr + 20 * 8 + .cfi_offset 65, offsetof_sigcontext_fr + 20 * 8 + 4 + .cfi_offset 66, offsetof_sigcontext_fr + 21 * 8 + .cfi_offset 67, offsetof_sigcontext_fr + 21 * 8 + 4 + .cfi_offset 68, offsetof_sigcontext_fr + 22 * 8 + .cfi_offset 69, offsetof_sigcontext_fr + 22 * 8 + 4 + .cfi_offset 70, offsetof_sigcontext_fr + 23 * 8 + .cfi_offset 71, offsetof_sigcontext_fr + 23 * 8 + 4 + .cfi_offset 72, offsetof_sigcontext_fr + 24 * 8 + .cfi_offset 73, offsetof_sigcontext_fr + 24 * 8 + 4 + .cfi_offset 74, offsetof_sigcontext_fr + 25 * 8 + .cfi_offset 75, offsetof_sigcontext_fr + 25 * 8 + 4 + .cfi_offset 76, offsetof_sigcontext_fr + 26 * 8 + .cfi_offset 77, offsetof_sigcontext_fr + 26 * 8 + 4 + .cfi_offset 78, offsetof_sigcontext_fr + 27 * 8 + .cfi_offset 79, offsetof_sigcontext_fr + 27 * 8 + 4 + .cfi_offset 80, offsetof_sigcontext_fr + 28 * 8 + .cfi_offset 81, offsetof_sigcontext_fr + 28 * 8 + 4 + .cfi_offset 82, offsetof_sigcontext_fr + 29 * 8 + .cfi_offset 83, offsetof_sigcontext_fr + 29 * 8 + 4 + .cfi_offset 84, offsetof_sigcontext_fr + 30 * 8 + .cfi_offset 85, offsetof_sigcontext_fr + 30 * 8 + 4 + .cfi_offset 86, offsetof_sigcontext_fr + 31 * 8 + .cfi_offset 87, offsetof_sigcontext_fr + 31 * 8 + 4 + + /* Record save offset of %sar */ + .cfi_offset 88, offsetof_sigcontext_sar + + /* Record save offset of return address, iaoq[0]. */ + .cfi_return_column 89 + .cfi_offset 89, offsetof_sigcontext_iaoq + + nop + +__kernel_sigtramp_rt: + ldi 0, %r25 + ldi __NR_rt_sigreturn, %r20 + be,l 0x100(%sr2, %r0), %sr0, %r31 + nop + + .cfi_endproc + .size __kernel_sigtramp_rt, . - __kernel_sigtramp_rt + .type __kernel_sigtramp_rt, @function + .globl __kernel_sigtramp_rt |