| Message ID | 20230930021529.987950-14-richard.henderson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | linux-user: Implement VDSOs | expand |
On 30/9/23 04:15, Richard Henderson wrote: > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > linux-user/hppa/vdso-asmoffset.h | 12 +++ > linux-user/elfload.c | 2 + > linux-user/hppa/signal.c | 24 +++-- > linux-user/hppa/Makefile.vdso | 11 +++ > linux-user/hppa/meson.build | 5 + > linux-user/hppa/vdso.S | 165 +++++++++++++++++++++++++++++++ > linux-user/hppa/vdso.ld | 77 +++++++++++++++ > linux-user/hppa/vdso.so | Bin 0 -> 2104 bytes > 8 files changed, 286 insertions(+), 10 deletions(-) > create mode 100644 linux-user/hppa/vdso-asmoffset.h > create mode 100644 linux-user/hppa/Makefile.vdso > create mode 100644 linux-user/hppa/vdso.S > create mode 100644 linux-user/hppa/vdso.ld > create mode 100755 linux-user/hppa/vdso.so The overall LGTM, so: Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Cc'ing Helge who have better knowledge of HPPA. > diff --git a/linux-user/hppa/vdso-asmoffset.h b/linux-user/hppa/vdso-asmoffset.h > new file mode 100644 > index 0000000000..c8b40c0332 > --- /dev/null > +++ b/linux-user/hppa/vdso-asmoffset.h > @@ -0,0 +1,12 @@ > +#define sizeof_rt_sigframe 584 > +#define offsetof_sigcontext 160 > +#define offsetof_sigcontext_gr 0x4 > +#define offsetof_sigcontext_fr 0x88 > +#define offsetof_sigcontext_iaoq 0x190 > +#define offsetof_sigcontext_sar 0x198 > + > +/* arch/parisc/include/asm/rt_sigframe.h */ > +#define SIGFRAME 64 > +#define FUNCTIONCALLFRAME 48 > +#define PARISC_RT_SIGFRAME_SIZE32 \ > + (((sizeof_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) > diff --git a/linux-user/elfload.c b/linux-user/elfload.c > index a65401f8d5..ccf8a1dc78 100644 > --- a/linux-user/elfload.c > +++ b/linux-user/elfload.c > @@ -1921,6 +1921,8 @@ static inline void init_thread(struct target_pt_regs *regs, > #define STACK_GROWS_DOWN 0 > #define STACK_ALIGNMENT 64 > > +#define VDSO_HEADER "vdso.c.inc" > + > static inline void init_thread(struct target_pt_regs *regs, > struct image_info *infop) > { > diff --git a/linux-user/hppa/signal.c b/linux-user/hppa/signal.c > index bda6e54655..741dac79b6 100644 > --- a/linux-user/hppa/signal.c > +++ b/linux-user/hppa/signal.c > @@ -21,6 +21,7 @@ > #include "user-internals.h" > #include "signal-common.h" > #include "linux-user/trace.h" > +#include "vdso-asmoffset.h" > > struct target_sigcontext { > abi_ulong sc_flags; > @@ -47,6 +48,19 @@ struct target_rt_sigframe { > /* hidden location of upper halves of pa2.0 64-bit gregs */ > }; > > +QEMU_BUILD_BUG_ON(sizeof(struct target_rt_sigframe) != sizeof_rt_sigframe); > +QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe, uc.tuc_mcontext) > + != offsetof_sigcontext); > +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_gr) > + != offsetof_sigcontext_gr); > +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_fr) > + != offsetof_sigcontext_fr); > +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_iaoq) > + != offsetof_sigcontext_iaoq); > +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_sar) > + != offsetof_sigcontext_sar); > + > + > static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env) > { > int i; > @@ -91,16 +105,6 @@ static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) > __get_user(env->cr[CR_SAR], &sc->sc_sar); > } > > -#if TARGET_ABI_BITS == 32 > -#define SIGFRAME 64 > -#define FUNCTIONCALLFRAME 48 > -#else > -#define SIGFRAME 128 > -#define FUNCTIONCALLFRAME 96 > -#endif > -#define PARISC_RT_SIGFRAME_SIZE32 \ > - ((sizeof(struct target_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) > - > void setup_rt_frame(int sig, struct target_sigaction *ka, > target_siginfo_t *info, > target_sigset_t *set, CPUArchState *env) > diff --git a/linux-user/hppa/Makefile.vdso b/linux-user/hppa/Makefile.vdso > new file mode 100644 > index 0000000000..f4537ae716 > --- /dev/null > +++ b/linux-user/hppa/Makefile.vdso > @@ -0,0 +1,11 @@ > +include $(BUILD_DIR)/tests/tcg/hppa-linux-user/config-target.mak > + > +SUBDIR = $(SRC_PATH)/linux-user/hppa > +VPATH += $(SUBDIR) > + > +all: $(SUBDIR)/vdso.so > + > +$(SUBDIR)/vdso.so: vdso.S vdso.ld vdso-asmoffset.h > + $(CC) -o $@ -nostdlib -shared -Wl,-h,linux-vdso32.so.1 \ > + -Wl,--build-id=sha1 -Wl,--hash-style=both \ > + -Wl,-T,$(SUBDIR)/vdso.ld $< > diff --git a/linux-user/hppa/meson.build b/linux-user/hppa/meson.build > index 4709508a09..aa2d9a87a6 100644 > --- a/linux-user/hppa/meson.build > +++ b/linux-user/hppa/meson.build > @@ -3,3 +3,8 @@ syscall_nr_generators += { > arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ], > output: '@BASENAME@_nr.h') > } > + > +vdso_inc = gen_vdso.process('vdso.so', > + extra_args: [ '-r', '__kernel_sigtramp_rt' ]) > + > +linux_user_ss.add(when: 'TARGET_HPPA', if_true: vdso_inc) > 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 > diff --git a/linux-user/hppa/vdso.ld b/linux-user/hppa/vdso.ld > new file mode 100644 > index 0000000000..b17ad974f3 > --- /dev/null > +++ b/linux-user/hppa/vdso.ld > @@ -0,0 +1,77 @@ > +/* > + * Linker script for linux hppa vdso. > + * > + * This library is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2 of the License, or (at your option) any later version. > + * > + * This library is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with this library; if not, see <http://www.gnu.org/licenses/>. > + */ > + > +VERSION { > + /* > + * The kernel's vdso32.lds.S attempts to export > + * __kernel_sigtramp_rt32 > + * __kernel_restart_syscall32 > + * except that those symbols don't exist. The actual symbols are > + * __kernel_sigtramp_rt > + * __kernel_restart_syscall > + * which means that nothing is exported at all. > + * QEMU handles syscall restart internally, so we don't > + * need to implement __kernel_restart_syscall at all. > + */ > + LINUX_5.18 { > + local: *; > + }; > +} > + > + > +PHDRS { > + phdr PT_PHDR FLAGS(4) PHDRS; > + load PT_LOAD FLAGS(7) FILEHDR PHDRS; > + dynamic PT_DYNAMIC FLAGS(4); > + note PT_NOTE FLAGS(4); > + eh_frame_hdr PT_GNU_EH_FRAME; > +} > + > +SECTIONS { > + . = SIZEOF_HEADERS; > + > + /* The following, including the FILEHDRS and PHDRS, are modified > + when we relocate the binary. We want them to be initially > + writable for the relocation; we'll force them read-only after. */ > + .note : { *(.note*) } :load :note > + .dynamic : { *(.dynamic) } :load :dynamic > + .dynsym : { *(.dynsym) } :load > + .data : { > + /* There ought not be any real read-write data. > + But since we manipulated the segment layout, > + we have to put these sections somewhere. */ > + *(.data*) > + *(.sdata*) > + *(.got.plt) *(.got) > + *(.gnu.linkonce.d.*) > + *(.bss*) > + *(.dynbss*) > + *(.gnu.linkonce.b.*) > + } > + > + .rodata : { *(.rodata) } > + .hash : { *(.hash) } > + .gnu.hash : { *(.gnu.hash) } > + .dynstr : { *(.dynstr) } > + .gnu.version : { *(.gnu.version) } > + .gnu.version_d : { *(.gnu.version_d) } > + .gnu.version_r : { *(.gnu.version_r) } > + .eh_frame_hdr : { *(.eh_frame_hdr) } :load :eh_frame_hdr > + .eh_frame : { *(.eh_frame) } :load > + > + .text : { *(.text*) } :load > +}
diff --git a/linux-user/hppa/vdso-asmoffset.h b/linux-user/hppa/vdso-asmoffset.h new file mode 100644 index 0000000000..c8b40c0332 --- /dev/null +++ b/linux-user/hppa/vdso-asmoffset.h @@ -0,0 +1,12 @@ +#define sizeof_rt_sigframe 584 +#define offsetof_sigcontext 160 +#define offsetof_sigcontext_gr 0x4 +#define offsetof_sigcontext_fr 0x88 +#define offsetof_sigcontext_iaoq 0x190 +#define offsetof_sigcontext_sar 0x198 + +/* arch/parisc/include/asm/rt_sigframe.h */ +#define SIGFRAME 64 +#define FUNCTIONCALLFRAME 48 +#define PARISC_RT_SIGFRAME_SIZE32 \ + (((sizeof_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index a65401f8d5..ccf8a1dc78 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1921,6 +1921,8 @@ static inline void init_thread(struct target_pt_regs *regs, #define STACK_GROWS_DOWN 0 #define STACK_ALIGNMENT 64 +#define VDSO_HEADER "vdso.c.inc" + static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) { diff --git a/linux-user/hppa/signal.c b/linux-user/hppa/signal.c index bda6e54655..741dac79b6 100644 --- a/linux-user/hppa/signal.c +++ b/linux-user/hppa/signal.c @@ -21,6 +21,7 @@ #include "user-internals.h" #include "signal-common.h" #include "linux-user/trace.h" +#include "vdso-asmoffset.h" struct target_sigcontext { abi_ulong sc_flags; @@ -47,6 +48,19 @@ struct target_rt_sigframe { /* hidden location of upper halves of pa2.0 64-bit gregs */ }; +QEMU_BUILD_BUG_ON(sizeof(struct target_rt_sigframe) != sizeof_rt_sigframe); +QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe, uc.tuc_mcontext) + != offsetof_sigcontext); +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_gr) + != offsetof_sigcontext_gr); +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_fr) + != offsetof_sigcontext_fr); +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_iaoq) + != offsetof_sigcontext_iaoq); +QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_sar) + != offsetof_sigcontext_sar); + + static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env) { int i; @@ -91,16 +105,6 @@ static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) __get_user(env->cr[CR_SAR], &sc->sc_sar); } -#if TARGET_ABI_BITS == 32 -#define SIGFRAME 64 -#define FUNCTIONCALLFRAME 48 -#else -#define SIGFRAME 128 -#define FUNCTIONCALLFRAME 96 -#endif -#define PARISC_RT_SIGFRAME_SIZE32 \ - ((sizeof(struct target_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) - void setup_rt_frame(int sig, struct target_sigaction *ka, target_siginfo_t *info, target_sigset_t *set, CPUArchState *env) diff --git a/linux-user/hppa/Makefile.vdso b/linux-user/hppa/Makefile.vdso new file mode 100644 index 0000000000..f4537ae716 --- /dev/null +++ b/linux-user/hppa/Makefile.vdso @@ -0,0 +1,11 @@ +include $(BUILD_DIR)/tests/tcg/hppa-linux-user/config-target.mak + +SUBDIR = $(SRC_PATH)/linux-user/hppa +VPATH += $(SUBDIR) + +all: $(SUBDIR)/vdso.so + +$(SUBDIR)/vdso.so: vdso.S vdso.ld vdso-asmoffset.h + $(CC) -o $@ -nostdlib -shared -Wl,-h,linux-vdso32.so.1 \ + -Wl,--build-id=sha1 -Wl,--hash-style=both \ + -Wl,-T,$(SUBDIR)/vdso.ld $< diff --git a/linux-user/hppa/meson.build b/linux-user/hppa/meson.build index 4709508a09..aa2d9a87a6 100644 --- a/linux-user/hppa/meson.build +++ b/linux-user/hppa/meson.build @@ -3,3 +3,8 @@ syscall_nr_generators += { arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ], output: '@BASENAME@_nr.h') } + +vdso_inc = gen_vdso.process('vdso.so', + extra_args: [ '-r', '__kernel_sigtramp_rt' ]) + +linux_user_ss.add(when: 'TARGET_HPPA', if_true: vdso_inc) 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 diff --git a/linux-user/hppa/vdso.ld b/linux-user/hppa/vdso.ld new file mode 100644 index 0000000000..b17ad974f3 --- /dev/null +++ b/linux-user/hppa/vdso.ld @@ -0,0 +1,77 @@ +/* + * Linker script for linux hppa vdso. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +VERSION { + /* + * The kernel's vdso32.lds.S attempts to export + * __kernel_sigtramp_rt32 + * __kernel_restart_syscall32 + * except that those symbols don't exist. The actual symbols are + * __kernel_sigtramp_rt + * __kernel_restart_syscall + * which means that nothing is exported at all. + * QEMU handles syscall restart internally, so we don't + * need to implement __kernel_restart_syscall at all. + */ + LINUX_5.18 { + local: *; + }; +} + + +PHDRS { + phdr PT_PHDR FLAGS(4) PHDRS; + load PT_LOAD FLAGS(7) FILEHDR PHDRS; + dynamic PT_DYNAMIC FLAGS(4); + note PT_NOTE FLAGS(4); + eh_frame_hdr PT_GNU_EH_FRAME; +} + +SECTIONS { + . = SIZEOF_HEADERS; + + /* The following, including the FILEHDRS and PHDRS, are modified + when we relocate the binary. We want them to be initially + writable for the relocation; we'll force them read-only after. */ + .note : { *(.note*) } :load :note + .dynamic : { *(.dynamic) } :load :dynamic + .dynsym : { *(.dynsym) } :load + .data : { + /* There ought not be any real read-write data. + But since we manipulated the segment layout, + we have to put these sections somewhere. */ + *(.data*) + *(.sdata*) + *(.got.plt) *(.got) + *(.gnu.linkonce.d.*) + *(.bss*) + *(.dynbss*) + *(.gnu.linkonce.b.*) + } + + .rodata : { *(.rodata) } + .hash : { *(.hash) } + .gnu.hash : { *(.gnu.hash) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + .eh_frame_hdr : { *(.eh_frame_hdr) } :load :eh_frame_hdr + .eh_frame : { *(.eh_frame) } :load + + .text : { *(.text*) } :load +} diff --git a/linux-user/hppa/vdso.so b/linux-user/hppa/vdso.so new file mode 100755 index 0000000000000000000000000000000000000000..e1ddd70c37e9eb6871c21d538dcce0a1e736a918
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