[v6,16/19] linux-user/ppc: Add vdso

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/ppc/vdso-asmoffset.h |  20 +++
 linux-user/elfload.c            |   8 ++
 linux-user/ppc/signal.c         |  31 +++--
 linux-user/gen-vdso-elfn.c.inc  |   7 +
 linux-user/ppc/Makefile.vdso    |  20 +++
 linux-user/ppc/meson.build      |  12 ++
 linux-user/ppc/vdso-32.ld       |  70 ++++++++++
 linux-user/ppc/vdso-32.so       | Bin 0 -> 3020 bytes
 linux-user/ppc/vdso-64.ld       |  68 +++++++++
 linux-user/ppc/vdso-64.so       | Bin 0 -> 3896 bytes
 linux-user/ppc/vdso-64le.so     | Bin 0 -> 3896 bytes
 linux-user/ppc/vdso.S           | 239 ++++++++++++++++++++++++++++++++
 12 files changed, 467 insertions(+), 8 deletions(-)
 create mode 100644 linux-user/ppc/vdso-asmoffset.h
 create mode 100644 linux-user/ppc/Makefile.vdso
 create mode 100644 linux-user/ppc/vdso-32.ld
 create mode 100755 linux-user/ppc/vdso-32.so
 create mode 100644 linux-user/ppc/vdso-64.ld
 create mode 100755 linux-user/ppc/vdso-64.so
 create mode 100755 linux-user/ppc/vdso-64le.so
 create mode 100644 linux-user/ppc/vdso.S

On 30/9/23 04:15, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   linux-user/ppc/vdso-asmoffset.h |  20 +++
>   linux-user/elfload.c            |   8 ++
>   linux-user/ppc/signal.c         |  31 +++--
>   linux-user/gen-vdso-elfn.c.inc  |   7 +
>   linux-user/ppc/Makefile.vdso    |  20 +++
>   linux-user/ppc/meson.build      |  12 ++
>   linux-user/ppc/vdso-32.ld       |  70 ++++++++++
>   linux-user/ppc/vdso-32.so       | Bin 0 -> 3020 bytes
>   linux-user/ppc/vdso-64.ld       |  68 +++++++++
>   linux-user/ppc/vdso-64.so       | Bin 0 -> 3896 bytes
>   linux-user/ppc/vdso-64le.so     | Bin 0 -> 3896 bytes
>   linux-user/ppc/vdso.S           | 239 ++++++++++++++++++++++++++++++++
>   12 files changed, 467 insertions(+), 8 deletions(-)
>   create mode 100644 linux-user/ppc/vdso-asmoffset.h
>   create mode 100644 linux-user/ppc/Makefile.vdso
>   create mode 100644 linux-user/ppc/vdso-32.ld
>   create mode 100755 linux-user/ppc/vdso-32.so
>   create mode 100644 linux-user/ppc/vdso-64.ld
>   create mode 100755 linux-user/ppc/vdso-64.so
>   create mode 100755 linux-user/ppc/vdso-64le.so
>   create mode 100644 linux-user/ppc/vdso.S

Scratching my head for the CFA/CFI lines, so Cc'ing Nicholas, Daniel
and Cédric.

Do you mind adding a quick comment for the DT_PPC64_OPT change in
the description?

LGTM. To the best of my PPC knowledge,
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

> diff --git a/linux-user/ppc/vdso-asmoffset.h b/linux-user/ppc/vdso-asmoffset.h
> new file mode 100644
> index 0000000000..6844c8c81c
> --- /dev/null
> +++ b/linux-user/ppc/vdso-asmoffset.h
> @@ -0,0 +1,20 @@
> +/*
> + * Size of dummy stack frame allocated when calling signal handler.
> + * See arch/powerpc/include/asm/ptrace.h.
> + */
> +#ifdef TARGET_ABI32
> +# define SIGNAL_FRAMESIZE                   64
> +#else
> +# define SIGNAL_FRAMESIZE                   128
> +#endif
> +
> +#ifdef TARGET_ABI32
> +# define offsetof_sigframe_mcontext         0x20
> +# define offsetof_rt_sigframe_mcontext      0x140
> +# define offsetof_mcontext_fregs            0xc0
> +# define offsetof_mcontext_vregs            0x1d0
> +#else
> +# define offsetof_rt_sigframe_mcontext      0xe8
> +# define offsetof_mcontext_fregs            0x180
> +# define offsetof_mcontext_vregs_ptr        0x288
> +#endif
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index f41a57ebd5..4a2d21a1f9 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -1187,6 +1187,14 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *en
>   #define USE_ELF_CORE_DUMP
>   #define ELF_EXEC_PAGESIZE       4096
>   
> +#ifndef TARGET_PPC64
> +# define VDSO_HEADER  "vdso-32.c.inc"
> +#elif TARGET_BIG_ENDIAN
> +# define VDSO_HEADER  "vdso-64.c.inc"
> +#else
> +# define VDSO_HEADER  "vdso-64le.c.inc"
> +#endif
> +
>   #endif
>   
>   #ifdef TARGET_LOONGARCH64
> diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c
> index a616f20efb..7e7302823b 100644
> --- a/linux-user/ppc/signal.c
> +++ b/linux-user/ppc/signal.c
> @@ -21,14 +21,7 @@
>   #include "user-internals.h"
>   #include "signal-common.h"
>   #include "linux-user/trace.h"
> -
> -/* Size of dummy stack frame allocated when calling signal handler.
> -   See arch/powerpc/include/asm/ptrace.h.  */
> -#if defined(TARGET_PPC64)
> -#define SIGNAL_FRAMESIZE 128
> -#else
> -#define SIGNAL_FRAMESIZE 64
> -#endif
> +#include "vdso-asmoffset.h"
>   
>   /* See arch/powerpc/include/asm/ucontext.h.  Only used for 32-bit PPC;
>      on 64-bit PPC, sigcontext and mcontext are one and the same.  */
> @@ -73,6 +66,16 @@ struct target_mcontext {
>   #endif
>   };
>   
> +QEMU_BUILD_BUG_ON(offsetof(struct target_mcontext, mc_fregs)
> +                  != offsetof_mcontext_fregs);
> +#if defined(TARGET_PPC64)
> +QEMU_BUILD_BUG_ON(offsetof(struct target_mcontext, v_regs)
> +                  != offsetof_mcontext_vregs_ptr);
> +#else
> +QEMU_BUILD_BUG_ON(offsetof(struct target_mcontext, mc_vregs)
> +                  != offsetof_mcontext_vregs);
> +#endif
> +
>   /* See arch/powerpc/include/asm/sigcontext.h.  */
>   struct target_sigcontext {
>       target_ulong _unused[4];
> @@ -161,6 +164,7 @@ struct target_ucontext {
>   #endif
>   };
>   
> +#if !defined(TARGET_PPC64)
>   /* See arch/powerpc/kernel/signal_32.c.  */
>   struct target_sigframe {
>       struct target_sigcontext sctx;
> @@ -168,6 +172,10 @@ struct target_sigframe {
>       int32_t abigap[56];
>   };
>   
> +QEMU_BUILD_BUG_ON(offsetof(struct target_sigframe, mctx)
> +                  != offsetof_sigframe_mcontext);
> +#endif
> +
>   #if defined(TARGET_PPC64)
>   
>   #define TARGET_TRAMP_SIZE 6
> @@ -184,6 +192,10 @@ struct target_rt_sigframe {
>       char abigap[288];
>   } __attribute__((aligned(16)));
>   
> +QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe,
> +                           uc.tuc_sigcontext.mcontext)
> +                  != offsetof_rt_sigframe_mcontext);
> +
>   #else
>   
>   struct target_rt_sigframe {
> @@ -192,6 +204,9 @@ struct target_rt_sigframe {
>       int32_t abigap[56];
>   };
>   
> +QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe, uc.tuc_mcontext)
> +                  != offsetof_rt_sigframe_mcontext);
> +
>   #endif
>   
>   #if defined(TARGET_PPC64)
> diff --git a/linux-user/gen-vdso-elfn.c.inc b/linux-user/gen-vdso-elfn.c.inc
> index 7034c36d5e..95856eb839 100644
> --- a/linux-user/gen-vdso-elfn.c.inc
> +++ b/linux-user/gen-vdso-elfn.c.inc
> @@ -273,7 +273,14 @@ static void elfN(process)(FILE *outf, void *buf, bool need_bswap)
>                   errors++;
>                   break;
>   
> +            case PT_LOPROC + 3:
> +                if (ehdr->e_machine == EM_PPC64) {
> +                    break;  /* DT_PPC64_OPT: integer bitmask */
> +                }
> +                goto do_default;
> +
>               default:
> +            do_default:
>                   /* This is probably something target specific. */
>                   fprintf(stderr, "VDSO has unknown DYNAMIC entry (%lx)\n",
>                           (unsigned long)tag);
> diff --git a/linux-user/ppc/Makefile.vdso b/linux-user/ppc/Makefile.vdso
> new file mode 100644
> index 0000000000..3ca3c6b83e
> --- /dev/null
> +++ b/linux-user/ppc/Makefile.vdso
> @@ -0,0 +1,20 @@
> +include $(BUILD_DIR)/tests/tcg/ppc64-linux-user/config-target.mak
> +
> +SUBDIR = $(SRC_PATH)/linux-user/ppc
> +VPATH += $(SUBDIR)
> +
> +all: $(SUBDIR)/vdso-32.so $(SUBDIR)/vdso-64.so $(SUBDIR)/vdso-64le.so
> +
> +LDFLAGS32 = -nostdlib -shared -Wl,-T,$(SUBDIR)/vdso-32.ld \
> +            -Wl,-h,linux-vdso32.so.1 -Wl,--hash-style=both -Wl,--build-id=sha1
> +LDFLAGS64 = -nostdlib -shared -Wl,-T,$(SUBDIR)/vdso-64.ld \
> +            -Wl,-h,linux-vdso64.so.1 -Wl,--hash-style=both -Wl,--build-id=sha1
> +
> +$(SUBDIR)/vdso-32.so: vdso.S vdso-32.ld vdso-asmoffset.h
> +	$(CC) -o $@ $(LDFLAGS32) -m32 $<
> +
> +$(SUBDIR)/vdso-64.so: vdso.S vdso-64.ld vdso-asmoffset.h
> +	$(CC) -o $@ $(LDFLAGS64) -mbig-endian $<
> +
> +$(SUBDIR)/vdso-64le.so: vdso.S vdso-64.ld vdso-asmoffset.h
> +	$(CC) -o $@ $(LDFLAGS64) -mlittle-endian $<
> diff --git a/linux-user/ppc/meson.build b/linux-user/ppc/meson.build
> index 19fead7bc8..80cacae396 100644
> --- a/linux-user/ppc/meson.build
> +++ b/linux-user/ppc/meson.build
> @@ -3,3 +3,15 @@ syscall_nr_generators += {
>                      arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ],
>                      output: '@BASENAME@_nr.h')
>   }
> +
> +vdso_32_inc = gen_vdso.process('vdso-32.so', extra_args: [
> +                                   '-s', '__kernel_sigtramp32',
> +                                   '-r', '__kernel_sigtramp_rt32'
> +                               ])
> +linux_user_ss.add(when: 'TARGET_PPC', if_true: vdso_32_inc)
> +
> +vdso_64_inc = gen_vdso.process('vdso-64.so',
> +                               extra_args: ['-r', '__kernel_sigtramp_rt64'])
> +vdso_64le_inc = gen_vdso.process('vdso-64le.so',
> +                                 extra_args: ['-r', '__kernel_sigtramp_rt64'])
> +linux_user_ss.add(when: 'TARGET_PPC64', if_true: [vdso_64_inc, vdso_64le_inc])
> diff --git a/linux-user/ppc/vdso-32.ld b/linux-user/ppc/vdso-32.ld
> new file mode 100644
> index 0000000000..6962696540
> --- /dev/null
> +++ b/linux-user/ppc/vdso-32.ld
> @@ -0,0 +1,70 @@
> +/*
> + * Linker script for linux powerpc64 replacement vdso.
> + *
> + * Copyright 2023 Linaro, Ltd.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +VERSION {
> +        LINUX_2.6.15 {
> +        global:
> +                __kernel_gettimeofday;
> +                __kernel_clock_gettime;
> +                __kernel_clock_gettime64;
> +                __kernel_clock_getres;
> +                __kernel_time;
> +                __kernel_sync_dicache;
> +                __kernel_sigtramp32;
> +                __kernel_sigtramp_rt32;
> +                __kernel_getcpu;
> +        local: *;
> +        };
> +}
> +
> +PHDRS {
> +        phdr            PT_PHDR         FLAGS(4) PHDRS;
> +        load            PT_LOAD         FLAGS(7) FILEHDR PHDRS; /* FLAGS=RWX */
> +        dynamic         PT_DYNAMIC      FLAGS(4);
> +        eh_frame_hdr    PT_GNU_EH_FRAME;
> +        note            PT_NOTE         FLAGS(4);
> +}
> +
> +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/ppc/vdso-32.so b/linux-user/ppc/vdso-32.so
> new file mode 100755
> index 0000000000000000000000000000000000000000..b19baafb0d38e15b4a24def5c44a6d684714be45
> GIT binary patch
> literal 3020
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> 
> literal 0
> HcmV?d00001
> 
> diff --git a/linux-user/ppc/vdso-64.ld b/linux-user/ppc/vdso-64.ld
> new file mode 100644
> index 0000000000..a55c65ed54
> --- /dev/null
> +++ b/linux-user/ppc/vdso-64.ld
> @@ -0,0 +1,68 @@
> +/*
> + * Linker script for linux powerpc64 replacement vdso.
> + *
> + * Copyright 2023 Linaro, Ltd.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +VERSION {
> +        LINUX_2.6.15 {
> +        global:
> +                __kernel_gettimeofday;
> +                __kernel_clock_gettime;
> +                __kernel_clock_getres;
> +                __kernel_sync_dicache;
> +                __kernel_sigtramp_rt64;
> +                __kernel_getcpu;
> +                __kernel_time;
> +        local: *;
> +        };
> +}
> +
> +PHDRS {
> +        phdr            PT_PHDR         FLAGS(4) PHDRS;
> +        load            PT_LOAD         FLAGS(7) FILEHDR PHDRS; /* FLAGS=RWX */
> +        dynamic         PT_DYNAMIC      FLAGS(4);
> +        eh_frame_hdr    PT_GNU_EH_FRAME;
> +        note            PT_NOTE         FLAGS(4);
> +}
> +
> +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/ppc/vdso-64.so b/linux-user/ppc/vdso-64.so
> new file mode 100755
> index 0000000000000000000000000000000000000000..913c831b3819fc09912b9b31f7fbe9ee311ae12f
> GIT binary patch
> literal 3896
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> zsW^=~W-02{u9k!1`mJ|PoV_YnU0i;>+kW%g%Rg34j;I)dMT)<!km9je{d7-H|MeRo
> z+UFQ?^qpeeR5r~47E`x5pKbAx!UYPQdB8?3Wjm0bp8k_<-xwj<x7ijn)?`ny?R#74
> z{|5x55aryl|6TO}WFPS87d-kI5Ys;^+Y2F2eLbGkPNzp7R{=B+hDSfGbgDn((XS}I
> z3~{+fAMw;jdWuXM`*}pL(D+ge71GtbI=0g{GMZc3C*-FcKv!v}C<~T^D$gpLe5Kd6
> z#ot={-B0`Fk&ctUqz6B!h`oBIa_wkn@2T@cKfE8jEyCfRcqSF^4R^<Lxny5F-4%-r
> z7u0BPI@+Usv&flvwxD7Y(f)ygP3;w|>~Ja?jwPd!Xu_)|yK|XHUw=50tEm>f$<)Bm
> zhQU}iT~i&%rURQq)1H=t?cvRVn!u(l_(C{3Gyh04_|H7HgXWg@7wuWzH#9P)F#O@G
> z?<pUGI72t1!rF#F>mSG5r1i5A@q6@CBgZL2cDzmahJr>#IW^>HSl^5xuOk7=O}b&d
> z{aCS{D&8=mz9TQdu)#bD*2~~K0VOX%>2dH6L)j3_dlBXj!h!)P&%wehEXu&*7eMv{
> zq+v-4?&yQ1y|AnY?mPy|ldvKIcXh+vT~HB+l`&Wqg?l>T-UtMbLgNvrY=zbP;Jy}E
> z(+pKjaQ{=Vb}u}z2iEO|2Y12xMtG<J9uC2VdI;=<M}n}i4mMr3Ve>aOJo>c_)nD1L
> z<x3lCzOdo3&uyr^WW(d1*|7Cf8@64vVfzIecAU52iBD{J@?)D`R2cN`zaowzmJ8YJ
> zU-L>y>6*NdEzCxQ+{bKG$W~@!LO#uGT*x+N6GHB1HYwx*W>Z2QWR^GNGt5Q|d5GDl
> zA={aa8S*f*aYG(qHetwTnN1q<D6=U;KF2I?%IBGlm@>?4)RY~}#!MMuHg3vJW)r52
> zGMhAIjM<ba<IM7w>|!=z$!=z&mP{}kvt*LlxFwG<o3LaLvq?+#GMlnwAG5qqrkK6v
> z!-1_8q9ue2ttBrik>B$0-wWIb6u4NZImL8v8y}K}bk2f@gtM>_+P#%fS8+OzvKMvy
> zr{d-n$3oHP5Md=4mF1paoVT<O>#O|a<}b&Ey2}4<9@Dxy6KCcdtgp^Z&QqTDRld{t
> zoIO}y<-HR1ysl2?Hx~bCM(1we;LJ7-)b?!cubLyjtoNM%=T!UD-&T+A&0nn^T|W=i
> z@ABy5svUZd6CVAF(rLWj@aQx0phq83^~*&#bhsthyr&+|Z2Ue6H|!2KwgsCT!n;Fl
> zGtXgf(wK4LyXm4hFU*o!{!Kn`JDQnF+-@9M1hT_@xkx8sF2k76ES1j1MIbhuiu5I;
> z4#B#Jkz7Osx>EyzL?oMFJ(po+FrLXK)2SIoI3@z|M7RqxRXm)CVNGp`KrTL%Q$zTl
> zp#odb-@kg@seS40&#IzcX#RCsjYRD$y-)T2brGlD?StafzH)NgdbIU-q3U1nbB*Gf
> zidW}`8@~ee&3I`Yw;C0F9%yvyv%AngJ;!#uN|ZzOug?vQbTsOBb8716r*Wvo@6uaE
> z@#olf&zTU~>e(ERjwfTM$EW*u@;inobibdSV7%$~C3`RSKdl@pUY}PQ#S-*;`&adx
> zbLLR-cQziYW89ub=lyAo=s555ccHGINB4h2#Vd4w$FS_4+m1;KxhP(rlN!yu4pit}
> ze<wZhY8~qHRHJArir4*-OkBTLQ8oVr3+6gR`fWtNGpXqJr}am<z&p0&S7qKGid@o)
> TLT~?o+8puo)jWvPbH)D+{oljD
> 
> literal 0
> HcmV?d00001
> 
> diff --git a/linux-user/ppc/vdso-64le.so b/linux-user/ppc/vdso-64le.so
> new file mode 100755
> index 0000000000000000000000000000000000000000..258a03b807c4eca23547d978c16d1ad5ebd08bc5
> GIT binary patch
> literal 3896
> zcmcgvU2GIp6uvXl(gKCvgCJ-@i&R9Eg<`3dAMMg@`LQjvfc%I~x4YZ!(ssA*ZflFk
> zEC~;qkl2J5V|XYgCTNVQf{Oq3!NkOv^pOV>`(nZa2_*`eAl7sC-m^P9tkJ~8vza;H
> z{q8yU%)K-BoV!kQYl~?Zg2fU`M7||NqwZ*!&lbcrh*G>uQ7PsiU4mDm?)K_sdN9`I
> z+K%Wljf<%%-N{<$r!vu);$`%>UM)4xn&Wl+oDP%U6}lDC%M~qHYqM-D!Uy%ZUR|U8
> zSiAieW1ofBj`scH*7la@tux=QtI3pvuGN0C{_N=+7s+)Y-B4avDjSdBAUUGk_;WTv
> z`n+zJQUm3xZqxdcjM2iN%u`CduQk86Wx9=SgBoVlAG2!w3H{)=bz2W7W_0^ao|xPD
> zf5bkFB}IietG|m19ebbVFM9ZM$b+~(tIcvMpzY6l?7KBTsd=6*y>^Ow%40vG`R_E(
> z-`P^lk9q9HN$fzO*ETncgrGHMKjQh_Qa8n?*z|sBDC(y+b8l4#O8w=co7&Vzc5g(s
> zT;6-_ht(&#4$F6k6Th5$EnF2CUtK+N;pFby{&#*7w%r#=#v}c9ZzP?L4MY+>;oxYV
> z4fQ8NecV@sPDWCB7KaE84&~c4UcQwYjfd=TEEEhy-E6EkoeT~P+R1c%o#>Cnhep;7
> zhf|6AI$tW`s}-%g+V>x{H~Q**wVQB0rsszg&R_kmZ#!zz{-XWLdxzG-#QwLxx67!H
> z<eXB%sIs=u9-uWpi?<D^e?(n}PLgeob&8S^zfo0TWI3`AqfMjkznZt(i-t{Pc*TUK
> zu8aV~0rLb{uRzIhD18~`9D}k^C?A2jFTuQFm_Gy+X;_egg-NJ<5#%610v5&Lt^ruw
> z4@>&s?xV0Y2Fs#wPcPit162`N9)=YmxUU=T4}$*)v>b-&4p_Md9%zSEZBWw+4?Yd6
> zcf&)wV9ic=cn7R)fk&F*(EzM#0^fF6?}rVIQ2Vt58^3bku`eB{`@(@upF2?hnFEi1
> z>OjLK2cG!Efz2N~u;n8MwqA5#+XV-n{Lq1?K5%I6xHi9{9!H(sZ?dgy)vKj*R%L{2
> zS7=PgJqnEr*`d&ckk2SIDP*TYQ$p@lXj;g93e5<)U!ja4pH*ngkOveRH{?NuCJcE<
> zp-Dp?R%ptQ&nYx*$Ri5P81i|AGNyb%p)ph13XPkxOQ8u<1{In#Ww%08rVJ@GZOX7h
> zGp39vl(A%wLSvTfRcPFjQH3Tf8B=J|l1CMqvSgn^)0XU4XvUHQ3S~-UT%psn&)bD)
> zz|SmDEi&ylUHCT__8EDb1umX^aEPw=G>7<a#lpS8^~-H!;jYNwJNAl&nT6|$yU)Vx
> z6s4r&5eqXI*DZIKh1rSgS0P`Pt7C<HxhPg|EX<r-rwZ-o<?4DNKVOu%ldA5tT=|^s
> zY5GQybx`&6&hb~EeX;to7I~@{-ukjx^WOT^p?Pn8>CwEm9v#=bx9*(Le6c!6&vQpT
> zvIB?O{cXFNFlXcW#BSbcw{-g3n(du|&cZzGE*b?HKUXfib)iUU`8V|-7pSn5<iccW
> z;Y*DUq=Vh4(@CYHjN*xOMEJs^@!&u#lm%#uI+zX$UvGTK7Y(MOiccpMGaN~#Vu^S`
> z!ww5yBx?6yrHa_mFj{g;_|lP)G_Lf2mns~B>N@WGtnj{MU88wclqcM>5*t+Wc^mTn
> zWzFYbeGJK+Gq~2#cS>hNj?ep?^=0fMA%EH%d`_X7NU{+x;yFI&1J-O$wj|tUy%jmy
> znjD|=2I~fLLgDe*kJo|vZ{pdM{W-s|4rIOW^w+f5uE%D7K2Nje^E2DiT-~x88?&zX
> zoUd3f(#HJ!9EbG*?5DFfw>ht|=K1qC!t>{6p!`73#Qxs@HT*w@?Rnj}O<%FwpYtT^
> z3=gawy#6P&KYfEFoWEGNDmr)fuAe)0&Ikej-&>>OFGQ{qFP=Yte{_cCwMCed-}T}8
> WQjSr;8y}D^=0BklzBu&{{(k}Ee8OG;
> 
> literal 0
> HcmV?d00001
> 
> diff --git a/linux-user/ppc/vdso.S b/linux-user/ppc/vdso.S
> new file mode 100644
> index 0000000000..689010db13
> --- /dev/null
> +++ b/linux-user/ppc/vdso.S
> @@ -0,0 +1,239 @@
> +/*
> + * PowerPC linux replacement vdso.
> + *
> + * Copyright 2023 Linaro, Ltd.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include <asm/unistd.h>
> +#include <asm/errno.h>
> +
> +#ifndef _ARCH_PPC64
> +# define TARGET_ABI32
> +#endif
> +#include "vdso-asmoffset.h"
> +
> +
> +	.text
> +
> +.macro endf name
> +	.globl	\name
> +	.size	\name, .-\name
> +	/* For PPC64, functions have special linkage; we export pointers. */
> +#ifndef _ARCH_PPC64
> +	.type	\name, @function
> +#endif
> +.endm
> +
> +.macro raw_syscall nr
> +	addi	0, 0, \nr
> +	sc
> +.endm
> +
> +.macro vdso_syscall name, nr
> +\name:
> +	raw_syscall \nr
> +	blr
> +endf	\name
> +.endm
> +
> +	.cfi_startproc
> +
> +vdso_syscall __kernel_gettimeofday, __NR_gettimeofday
> +vdso_syscall __kernel_clock_gettime, __NR_clock_gettime
> +vdso_syscall __kernel_clock_getres, __NR_clock_getres
> +vdso_syscall __kernel_getcpu, __NR_getcpu
> +vdso_syscall __kernel_time, __NR_time
> +
> +#ifdef __NR_clock_gettime64
> +vdso_syscall __kernel_clock_gettime64, __NR_clock_gettime64
> +#endif
> +
> +__kernel_sync_dicache:
> +	/* qemu does not need to flush caches */
> +	blr
> +endf	__kernel_sync_dicache
> +
> +	.cfi_endproc
> +
> +/*
> + * TODO: __kernel_get_tbfreq
> + * This is probably a constant for QEMU.
> + */
> +
> +/*
> + * Start the unwind info at least one instruction before the signal
> + * trampoline, because the unwinder will assume we are returning
> + * after a call site.
> + */
> +
> +	.cfi_startproc simple
> +	.cfi_signal_frame
> +
> +#ifdef _ARCH_PPC64
> +# define __kernel_sigtramp_rt  __kernel_sigtramp_rt64
> +# define sizeof_reg	8
> +#else
> +# define __kernel_sigtramp_rt  __kernel_sigtramp_rt32
> +# define sizeof_reg	4
> +#endif
> +#define sizeof_freg	8
> +#define sizeof_vreg	16
> +
> +	.cfi_def_cfa	1, SIGNAL_FRAMESIZE + offsetof_rt_sigframe_mcontext
> +
> +	/* Return address */
> +	.cfi_return_column 67
> +	.cfi_offset	67, 32 * sizeof_reg		/* nip */
> +
> +	/* Integer registers */
> +	.cfi_offset	0, 0 * sizeof_reg
> +	.cfi_offset	1, 1 * sizeof_reg
> +	.cfi_offset	2, 2 * sizeof_reg
> +	.cfi_offset	3, 3 * sizeof_reg
> +	.cfi_offset	4, 4 * sizeof_reg
> +	.cfi_offset	5, 5 * sizeof_reg
> +	.cfi_offset	6, 6 * sizeof_reg
> +	.cfi_offset	7, 7 * sizeof_reg
> +	.cfi_offset	8, 8 * sizeof_reg
> +	.cfi_offset	9, 9 * sizeof_reg
> +	.cfi_offset	10, 10 * sizeof_reg
> +	.cfi_offset	11, 11 * sizeof_reg
> +	.cfi_offset	12, 12 * sizeof_reg
> +	.cfi_offset	13, 13 * sizeof_reg
> +	.cfi_offset	14, 14 * sizeof_reg
> +	.cfi_offset	15, 15 * sizeof_reg
> +	.cfi_offset	16, 16 * sizeof_reg
> +	.cfi_offset	17, 17 * sizeof_reg
> +	.cfi_offset	18, 18 * sizeof_reg
> +	.cfi_offset	19, 19 * sizeof_reg
> +	.cfi_offset	20, 20 * sizeof_reg
> +	.cfi_offset	21, 21 * sizeof_reg
> +	.cfi_offset	22, 22 * sizeof_reg
> +	.cfi_offset	23, 23 * sizeof_reg
> +	.cfi_offset	24, 24 * sizeof_reg
> +	.cfi_offset	25, 25 * sizeof_reg
> +	.cfi_offset	26, 26 * sizeof_reg
> +	.cfi_offset	27, 27 * sizeof_reg
> +	.cfi_offset	28, 28 * sizeof_reg
> +	.cfi_offset	29, 29 * sizeof_reg
> +	.cfi_offset	30, 30 * sizeof_reg
> +	.cfi_offset	31, 31 * sizeof_reg
> +	.cfi_offset	65, 36 * sizeof_reg		/* lr */
> +	.cfi_offset	70, 38 * sizeof_reg		/* ccr */
> +
> +	/* Floating point registers */
> +	.cfi_offset	32, offsetof_mcontext_fregs
> +	.cfi_offset	33, offsetof_mcontext_fregs + 1 * sizeof_freg
> +	.cfi_offset	34, offsetof_mcontext_fregs + 2 * sizeof_freg
> +	.cfi_offset	35, offsetof_mcontext_fregs + 3 * sizeof_freg
> +	.cfi_offset	36, offsetof_mcontext_fregs + 4 * sizeof_freg
> +	.cfi_offset	37, offsetof_mcontext_fregs + 5 * sizeof_freg
> +	.cfi_offset	38, offsetof_mcontext_fregs + 6 * sizeof_freg
> +	.cfi_offset	39, offsetof_mcontext_fregs + 7 * sizeof_freg
> +	.cfi_offset	40, offsetof_mcontext_fregs + 8 * sizeof_freg
> +	.cfi_offset	41, offsetof_mcontext_fregs + 9 * sizeof_freg
> +	.cfi_offset	42, offsetof_mcontext_fregs + 10 * sizeof_freg
> +	.cfi_offset	43, offsetof_mcontext_fregs + 11 * sizeof_freg
> +	.cfi_offset	44, offsetof_mcontext_fregs + 12 * sizeof_freg
> +	.cfi_offset	45, offsetof_mcontext_fregs + 13 * sizeof_freg
> +	.cfi_offset	46, offsetof_mcontext_fregs + 14 * sizeof_freg
> +	.cfi_offset	47, offsetof_mcontext_fregs + 15 * sizeof_freg
> +	.cfi_offset	48, offsetof_mcontext_fregs + 16 * sizeof_freg
> +	.cfi_offset	49, offsetof_mcontext_fregs + 17 * sizeof_freg
> +	.cfi_offset	50, offsetof_mcontext_fregs + 18 * sizeof_freg
> +	.cfi_offset	51, offsetof_mcontext_fregs + 19 * sizeof_freg
> +	.cfi_offset	52, offsetof_mcontext_fregs + 20 * sizeof_freg
> +	.cfi_offset	53, offsetof_mcontext_fregs + 21 * sizeof_freg
> +	.cfi_offset	54, offsetof_mcontext_fregs + 22 * sizeof_freg
> +	.cfi_offset	55, offsetof_mcontext_fregs + 23 * sizeof_freg
> +	.cfi_offset	56, offsetof_mcontext_fregs + 24 * sizeof_freg
> +	.cfi_offset	57, offsetof_mcontext_fregs + 25 * sizeof_freg
> +	.cfi_offset	58, offsetof_mcontext_fregs + 26 * sizeof_freg
> +	.cfi_offset	59, offsetof_mcontext_fregs + 27 * sizeof_freg
> +	.cfi_offset	60, offsetof_mcontext_fregs + 28 * sizeof_freg
> +	.cfi_offset	61, offsetof_mcontext_fregs + 29 * sizeof_freg
> +	.cfi_offset	62, offsetof_mcontext_fregs + 30 * sizeof_freg
> +	.cfi_offset	63, offsetof_mcontext_fregs + 31 * sizeof_freg
> +
> +	/*
> +	 * Unlike the kernel, unconditionally represent the Altivec/VSX regs.
> +	 * The space within the stack frame is always available, and most of
> +	 * our supported processors have them enabled.  The only complication
> +	 * for PPC64 is the misalignment, so that we have to use indirection.
> +	 */
> +.macro	save_vreg_ofs reg, ofs
> +#ifdef _ARCH_PPC64
> +	/*
> +	 * vreg = *(cfa + offsetof(v_regs)) + ofs
> +         *
> +         * The CFA is input to the expression on the stack, so:
> +	 * DW_CFA_expression reg, length (7),
> +         *   DW_OP_plus_uconst (0x23), vreg_ptr, DW_OP_deref (0x06),
> +	 *   DW_OP_plus_uconst (0x23), ofs
> +	 */
> +	.cfi_escape 0x10, 77 + \reg, 7, 0x23, (offsetof_mcontext_vregs_ptr & 0x7f) + 0x80, offsetof_mcontext_vregs_ptr >> 7, 0x06, 0x23, (\ofs & 0x7f) | 0x80, \ofs >> 7
> +#else
> +	.cfi_offset 77 + \reg, offsetof_mcontext_vregs + \ofs
> +#endif
> +.endm
> +
> +.macro	save_vreg reg
> +	save_vreg_ofs \reg, (\reg * sizeof_vreg)
> +.endm
> +
> +	save_vreg   0
> +	save_vreg   1
> +	save_vreg   2
> +	save_vreg   3
> +	save_vreg   4
> +	save_vreg   5
> +	save_vreg   6
> +	save_vreg   7
> +	save_vreg   8
> +	save_vreg   9
> +	save_vreg  10
> +	save_vreg  11
> +	save_vreg  12
> +	save_vreg  13
> +	save_vreg  14
> +	save_vreg  15
> +	save_vreg  16
> +	save_vreg  17
> +	save_vreg  18
> +	save_vreg  19
> +	save_vreg  20
> +	save_vreg  21
> +	save_vreg  22
> +	save_vreg  23
> +	save_vreg  24
> +	save_vreg  25
> +	save_vreg  26
> +	save_vreg  27
> +	save_vreg  28
> +	save_vreg  29
> +	save_vreg  30
> +	save_vreg  31
> +	save_vreg  32
> +	save_vreg_ofs 33, (32 * sizeof_vreg + 12)
> +
> +	nop
> +
> +__kernel_sigtramp_rt:
> +	raw_syscall __NR_rt_sigreturn
> +endf	__kernel_sigtramp_rt
> +
> +#ifndef _ARCH_PPC64
> +	/*
> +	 * The non-rt sigreturn has the same layout at a different offset.
> +	 * Move the CFA and leave all othe other descriptions the same.
> +	 */
> +	.cfi_def_cfa	1, SIGNAL_FRAMESIZE + offsetof_sigframe_mcontext
> +	nop
> +__kernel_sigtramp32:
> +	raw_syscall __NR_sigreturn
> +endf	__kernel_sigtramp32
> +#endif
> +
> +	.cfi_endproc