| Message ID | 20230930021529.987950-10-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: > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1267 > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > linux-user/i386/vdso-asmoffset.h | 6 ++ > linux-user/elfload.c | 19 +++- > linux-user/i386/signal.c | 11 +++ > linux-user/i386/Makefile.vdso | 11 +++ > linux-user/i386/meson.build | 7 ++ > linux-user/i386/vdso.S | 143 +++++++++++++++++++++++++++++++ > linux-user/i386/vdso.ld | 76 ++++++++++++++++ > linux-user/i386/vdso.so | Bin 0 -> 2672 bytes > 8 files changed, 271 insertions(+), 2 deletions(-) > create mode 100644 linux-user/i386/vdso-asmoffset.h > create mode 100644 linux-user/i386/Makefile.vdso > create mode 100644 linux-user/i386/vdso.S > create mode 100644 linux-user/i386/vdso.ld > create mode 100755 linux-user/i386/vdso.so Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> > diff --git a/linux-user/i386/vdso-asmoffset.h b/linux-user/i386/vdso-asmoffset.h > new file mode 100644 > index 0000000000..4e5ee0dd49 > --- /dev/null > +++ b/linux-user/i386/vdso-asmoffset.h > @@ -0,0 +1,6 @@ > +/* > + * offsetof(struct sigframe, sc.eip) > + * offsetof(struct rt_sigframe, uc.tuc_mcontext.eip) > + */ > +#define SIGFRAME_SIGCONTEXT_eip 64 > +#define RT_SIGFRAME_SIGCONTEXT_eip 220 > diff --git a/linux-user/elfload.c b/linux-user/elfload.c > index 9c97d14b7e..314ae7cacf 100644 > --- a/linux-user/elfload.c > +++ b/linux-user/elfload.c > @@ -305,12 +305,27 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en > (*regs)[15] = tswapreg(env->regs[R_ESP]); > (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff); > } > -#endif > + > +/* > + * i386 is the only target which supplies AT_SYSINFO for the vdso. > + * All others only supply AT_SYSINFO_EHDR. > + */ > +#define DLINFO_ARCH_ITEMS (vdso_info != NULL) > +#define ARCH_DLINFO \ > + do { \ > + if (vdso_info) { \ > + NEW_AUX_ENT(AT_SYSINFO, vdso_info->entry); \ > + } \ > + } while (0) > + > +#define VDSO_HEADER "vdso.c.inc" > + > +#endif /* TARGET_X86_64 */ > > #define USE_ELF_CORE_DUMP > #define ELF_EXEC_PAGESIZE 4096 > > -#endif > +#endif /* TARGET_I386 */ > > #ifdef TARGET_ARM > > diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c > index 60fa07d6f9..bc5d45302e 100644 > --- a/linux-user/i386/signal.c > +++ b/linux-user/i386/signal.c > @@ -214,6 +214,17 @@ struct rt_sigframe { > }; > #define TARGET_RT_SIGFRAME_FXSAVE_OFFSET ( \ > offsetof(struct rt_sigframe, fpstate) + TARGET_FPSTATE_FXSAVE_OFFSET) > + > +/* > + * Verify that vdso-asmoffset.h constants match. > + */ > +#include "i386/vdso-asmoffset.h" > + > +QEMU_BUILD_BUG_ON(offsetof(struct sigframe, sc.eip) > + != SIGFRAME_SIGCONTEXT_eip); > +QEMU_BUILD_BUG_ON(offsetof(struct rt_sigframe, uc.tuc_mcontext.eip) > + != RT_SIGFRAME_SIGCONTEXT_eip); > + > #else > > struct rt_sigframe { > diff --git a/linux-user/i386/Makefile.vdso b/linux-user/i386/Makefile.vdso > new file mode 100644 > index 0000000000..95bc616f6d > --- /dev/null > +++ b/linux-user/i386/Makefile.vdso > @@ -0,0 +1,11 @@ > +include $(BUILD_DIR)/tests/tcg/i386-linux-user/config-target.mak > + > +SUBDIR = $(SRC_PATH)/linux-user/i386 > +VPATH += $(SUBDIR) > + > +all: $(SUBDIR)/vdso.so > + > +$(SUBDIR)/vdso.so: vdso.S vdso.ld vdso-asmoffset.h > + $(CC) -o $@ -m32 -nostdlib -shared -Wl,-h,linux-gate.so.1 \ > + -Wl,--build-id=sha1 -Wl,--hash-style=both \ > + -Wl,-T,$(SUBDIR)/vdso.ld $< > diff --git a/linux-user/i386/meson.build b/linux-user/i386/meson.build > index ee523019a5..d42fc6cbc9 100644 > --- a/linux-user/i386/meson.build > +++ b/linux-user/i386/meson.build > @@ -3,3 +3,10 @@ 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: [ > + '-s', '__kernel_sigreturn', > + '-r', '__kernel_rt_sigreturn' > + ]) > + > +linux_user_ss.add(when: 'TARGET_I386', if_true: vdso_inc) > diff --git a/linux-user/i386/vdso.S b/linux-user/i386/vdso.S > new file mode 100644 > index 0000000000..e7a1f333a1 > --- /dev/null > +++ b/linux-user/i386/vdso.S > @@ -0,0 +1,143 @@ > +/* > + * i386 linux replacement vdso. > + * > + * Copyright 2023 Linaro, Ltd. > + * > + * SPDX-License-Identifier: GPL-2.0-or-later > + */ > + > +#include <asm/unistd.h> > +#include "vdso-asmoffset.h" > + > +.macro endf name > + .globl \name > + .type \name, @function > + .size \name, . - \name > +.endm > + > +.macro vdso_syscall1 name, nr > +\name: > + .cfi_startproc > + mov %ebx, %edx > + .cfi_register %ebx, %edx > + mov 4(%esp), %ebx > + mov $\nr, %eax > + int $0x80 > + mov %edx, %ebx > + ret > + .cfi_endproc > +endf \name > +.endm > + > +.macro vdso_syscall2 name, nr > +\name: > + .cfi_startproc > + mov %ebx, %edx > + .cfi_register %ebx, %edx > + mov 4(%esp), %ebx > + mov 8(%esp), %ecx > + mov $\nr, %eax > + int $0x80 > + mov %edx, %ebx > + ret > + .cfi_endproc > +endf \name > +.endm > + > +.macro vdso_syscall3 name, nr > +\name: > + .cfi_startproc > + push %ebx > + .cfi_adjust_cfa_offset 4 > + .cfi_rel_offset %ebx, 0 > + mov 8(%esp), %ebx > + mov 12(%esp), %ecx > + mov 16(%esp), %edx > + mov $\nr, %eax > + int $0x80 > + pop %ebx > + .cfi_adjust_cfa_offset -4 > + .cfi_restore %ebx > + ret > + .cfi_endproc > +endf \name > +.endm > + > +__kernel_vsyscall: > + .cfi_startproc > + int $0x80 > + ret > + .cfi_endproc > +endf __kernel_vsyscall > + > +vdso_syscall2 __vdso_clock_gettime, __NR_clock_gettime > +vdso_syscall2 __vdso_clock_gettime64, __NR_clock_gettime64 > +vdso_syscall2 __vdso_clock_getres, __NR_clock_getres > +vdso_syscall2 __vdso_gettimeofday, __NR_gettimeofday > +vdso_syscall1 __vdso_time, __NR_time > +vdso_syscall3 __vdso_getcpu, __NR_gettimeofday > + > +/* > + * Signal return handlers. > + */ > + > + .cfi_startproc simple > + .cfi_signal_frame > + > +/* > + * For convenience, put the cfa just above eip in sigcontext, and count > + * offsets backward from there. Re-compute the cfa in the two contexts > + * we have for signal unwinding. This is far simpler than the > + * DW_CFA_expression form that the kernel uses, and is equally correct. > + */ > + > + .cfi_def_cfa %esp, SIGFRAME_SIGCONTEXT_eip + 4 > + > + .cfi_offset %eip, -4 > + /* err, -8 */ > + /* trapno, -12 */ > + .cfi_offset %eax, -16 > + .cfi_offset %ecx, -20 > + .cfi_offset %edx, -24 > + .cfi_offset %ebx, -28 > + .cfi_offset %esp, -32 > + .cfi_offset %ebp, -36 > + .cfi_offset %esi, -40 > + .cfi_offset %edi, -44 > + > +/* > + * While this frame is marked as a signal frame, that only applies to how > + * the return address is handled for the outer frame. 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. > + */ > + nop > + > +__kernel_sigreturn: > + popl %eax /* pop sig */ > + .cfi_adjust_cfa_offset -4 > + movl $__NR_sigreturn, %eax > + int $0x80 > +endf __kernel_sigreturn > + > + .cfi_def_cfa_offset RT_SIGFRAME_SIGCONTEXT_eip + 4 > + nop > + > +__kernel_rt_sigreturn: > + movl $__NR_rt_sigreturn, %eax > + int $0x80 > +endf __kernel_rt_sigreturn > + > + .cfi_endproc > + > +/* > + * TODO: Add elf notes. E.g. > + * > + * #include <linux/elfnote.h> > + * ELFNOTE_START(Linux, 0, "a") > + * .long LINUX_VERSION_CODE > + * ELFNOTE_END > + * > + * but what version number would we set for QEMU? > + */ > diff --git a/linux-user/i386/vdso.ld b/linux-user/i386/vdso.ld > new file mode 100644 > index 0000000000..326b7a8f98 > --- /dev/null > +++ b/linux-user/i386/vdso.ld > @@ -0,0 +1,76 @@ > +/* > + * Linker script for linux i386 replacement vdso. > + * > + * Copyright 2023 Linaro, Ltd. > + * > + * SPDX-License-Identifier: GPL-2.0-or-later > + */ > + > +ENTRY(__kernel_vsyscall) > + > +VERSION { > + LINUX_2.6 { > + global: > + __vdso_clock_gettime; > + __vdso_gettimeofday; > + __vdso_time; > + __vdso_clock_getres; > + __vdso_clock_gettime64; > + __vdso_getcpu; > + }; > + > + LINUX_2.5 { > + global: > + __kernel_vsyscall; > + __kernel_sigreturn; > + __kernel_rt_sigreturn; > + 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 =0x90909090 > +} > diff --git a/linux-user/i386/vdso.so b/linux-user/i386/vdso.so > new file mode 100755 > index 0000000000000000000000000000000000000000..bdece5dfcf8da036d013262d4e37208350283cfa > GIT binary patch > literal 2672 > zcmbtWU1%It6u#5lG_z^4ZB?X_C>9o5sxCF8QBlyONt?nZ)?|y73e)ZGba%;SR(597 > zjTXE8QIiHtY6YPbDhO>6s(mPS(FX(Z2Q`g?1xp_^KInr_=|f8&)b;yj=5}w=eGok1 > z%XiMX=brmB_ny0ldSlx(O%qZAA|PnR8-(ZpuhYGj4)L&P5F5p65f&@qVw=PV(21ar > zS~fT!zaSUUNMnr<D?qmul%W%{|IXi?lnz58hBiXBldmd>Kqu7p`(Ouv?E|~S#J4vR > z?eBj&+ji~rg~eZ!zf~VSJr_pXM}D8DFrl0ORPzVHn5LKmbB!e|qzOC^tO77~@mIB) > zzl6kpgPDI3e2U8d6uIY2bq_`x0-wZWxDMLSfe$J6M%crOeHivUY<@1rr@`l7bI!EC > z1WQ>fZdBic@iW@_P1t@f_$4LZXEGSfcpH2f?e~Kj&v`Zj+$T!NBlkb|jQhnHeiL+a > z&lJb<kCS@_*v@tHJTOn=lluBDy{$|iW0~jDvC(tlyVi??Q=2p0KUP})m@B{A^3Fp? > z#y5Ta$e&ZC6Ayg2)jAG+!^M53FpOcdV3|2%)E={wiChkz(UhGxlDT|x*hrg>lO18$ > z-OkRAyW9oSmOj5{et#-4CVgruv?pIJqQxKI&ZY~dQ!H3DSHUrA-dxrymL5+h95ZU? > zqfdy~j)7gfjrM5g9c>HN9>C7<kIZ}NS==-4@5JK#YMzfafM=QF?WZPg6+aHhHu){t > z#@l_<Z)3bX7g}rJnLgP3J~0HQz%PJH;3Rk&d;okNJPDowp8;P3e*#_ve+BLUI4(td > zZBS?jb*;5I7#xS6XOVMV0Ql`GjNJ_U;OnA06ySNFpY!>?j(;zF-_-GQuCsOgock95 > z$CvrnLFHO513c5BE36+~5f2BEAVM30`47nj^o(oe;NgZND~~oF)87oe)%5l%caD!C > zZUR`#4&CABw}%(BE9KdV>yxiUf|Id`UI}64SIQGVslJnSd`)$H14yd$t+Ysc2<dgC > zZ=Q@t)>OQ(J+srhD+k<&>B<F{@o$-65V!Wyt>HxRj<L>q5)uze70i3T0nE36-;4MD > zX|P(C`eCbeVGnF6>~F$Q>&)x0)jBo>TdiYfVXJlMbJ%KKV=Y$enlO4^9_Z@du@yHB > zwchCMGqw$O_4gWmJ%e{HQ)lfOF0TyrZnl4$<)z$G>%HU>FE1lXy;xFj>Xa70cGRgB > zZe?<tMbsV}aT5E$PQl}h)U3Q?ifC%gN{nQau7X$*O<ToiCShkhk5lkGqh`U*=B*`$ > zkrGieW9%;^Moc4<LZq}r)G<pAcKN?aE5cZ-d1tTskoO0sTmQ-H0oHh)quV~pVEQOL > zf~-B80KOf}$M=_*fzCLdUB>YqcLID@7{~XU=z-4s6vh$lz%9JdjN|)G?1a8N?pfc* > zIKKY`&zcmDP2m_-KOf(Hg0)2EV}IgBfWHx_^Y;P~hc5SkbEE79n459x?;V(~$T$m@ > zjElobxDGGOT`N`AK*n(#-do~0bSZKjGMDr(AZ`H$D-74d^xS8@>$IiJAn|o+fMq_` > OKQ-<Y4#gXF;{FA}h_Ctp > > literal 0 > HcmV?d00001 >
diff --git a/linux-user/i386/vdso-asmoffset.h b/linux-user/i386/vdso-asmoffset.h new file mode 100644 index 0000000000..4e5ee0dd49 --- /dev/null +++ b/linux-user/i386/vdso-asmoffset.h @@ -0,0 +1,6 @@ +/* + * offsetof(struct sigframe, sc.eip) + * offsetof(struct rt_sigframe, uc.tuc_mcontext.eip) + */ +#define SIGFRAME_SIGCONTEXT_eip 64 +#define RT_SIGFRAME_SIGCONTEXT_eip 220 diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 9c97d14b7e..314ae7cacf 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -305,12 +305,27 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en (*regs)[15] = tswapreg(env->regs[R_ESP]); (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff); } -#endif + +/* + * i386 is the only target which supplies AT_SYSINFO for the vdso. + * All others only supply AT_SYSINFO_EHDR. + */ +#define DLINFO_ARCH_ITEMS (vdso_info != NULL) +#define ARCH_DLINFO \ + do { \ + if (vdso_info) { \ + NEW_AUX_ENT(AT_SYSINFO, vdso_info->entry); \ + } \ + } while (0) + +#define VDSO_HEADER "vdso.c.inc" + +#endif /* TARGET_X86_64 */ #define USE_ELF_CORE_DUMP #define ELF_EXEC_PAGESIZE 4096 -#endif +#endif /* TARGET_I386 */ #ifdef TARGET_ARM diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c index 60fa07d6f9..bc5d45302e 100644 --- a/linux-user/i386/signal.c +++ b/linux-user/i386/signal.c @@ -214,6 +214,17 @@ struct rt_sigframe { }; #define TARGET_RT_SIGFRAME_FXSAVE_OFFSET ( \ offsetof(struct rt_sigframe, fpstate) + TARGET_FPSTATE_FXSAVE_OFFSET) + +/* + * Verify that vdso-asmoffset.h constants match. + */ +#include "i386/vdso-asmoffset.h" + +QEMU_BUILD_BUG_ON(offsetof(struct sigframe, sc.eip) + != SIGFRAME_SIGCONTEXT_eip); +QEMU_BUILD_BUG_ON(offsetof(struct rt_sigframe, uc.tuc_mcontext.eip) + != RT_SIGFRAME_SIGCONTEXT_eip); + #else struct rt_sigframe { diff --git a/linux-user/i386/Makefile.vdso b/linux-user/i386/Makefile.vdso new file mode 100644 index 0000000000..95bc616f6d --- /dev/null +++ b/linux-user/i386/Makefile.vdso @@ -0,0 +1,11 @@ +include $(BUILD_DIR)/tests/tcg/i386-linux-user/config-target.mak + +SUBDIR = $(SRC_PATH)/linux-user/i386 +VPATH += $(SUBDIR) + +all: $(SUBDIR)/vdso.so + +$(SUBDIR)/vdso.so: vdso.S vdso.ld vdso-asmoffset.h + $(CC) -o $@ -m32 -nostdlib -shared -Wl,-h,linux-gate.so.1 \ + -Wl,--build-id=sha1 -Wl,--hash-style=both \ + -Wl,-T,$(SUBDIR)/vdso.ld $< diff --git a/linux-user/i386/meson.build b/linux-user/i386/meson.build index ee523019a5..d42fc6cbc9 100644 --- a/linux-user/i386/meson.build +++ b/linux-user/i386/meson.build @@ -3,3 +3,10 @@ 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: [ + '-s', '__kernel_sigreturn', + '-r', '__kernel_rt_sigreturn' + ]) + +linux_user_ss.add(when: 'TARGET_I386', if_true: vdso_inc) diff --git a/linux-user/i386/vdso.S b/linux-user/i386/vdso.S new file mode 100644 index 0000000000..e7a1f333a1 --- /dev/null +++ b/linux-user/i386/vdso.S @@ -0,0 +1,143 @@ +/* + * i386 linux replacement vdso. + * + * Copyright 2023 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <asm/unistd.h> +#include "vdso-asmoffset.h" + +.macro endf name + .globl \name + .type \name, @function + .size \name, . - \name +.endm + +.macro vdso_syscall1 name, nr +\name: + .cfi_startproc + mov %ebx, %edx + .cfi_register %ebx, %edx + mov 4(%esp), %ebx + mov $\nr, %eax + int $0x80 + mov %edx, %ebx + ret + .cfi_endproc +endf \name +.endm + +.macro vdso_syscall2 name, nr +\name: + .cfi_startproc + mov %ebx, %edx + .cfi_register %ebx, %edx + mov 4(%esp), %ebx + mov 8(%esp), %ecx + mov $\nr, %eax + int $0x80 + mov %edx, %ebx + ret + .cfi_endproc +endf \name +.endm + +.macro vdso_syscall3 name, nr +\name: + .cfi_startproc + push %ebx + .cfi_adjust_cfa_offset 4 + .cfi_rel_offset %ebx, 0 + mov 8(%esp), %ebx + mov 12(%esp), %ecx + mov 16(%esp), %edx + mov $\nr, %eax + int $0x80 + pop %ebx + .cfi_adjust_cfa_offset -4 + .cfi_restore %ebx + ret + .cfi_endproc +endf \name +.endm + +__kernel_vsyscall: + .cfi_startproc + int $0x80 + ret + .cfi_endproc +endf __kernel_vsyscall + +vdso_syscall2 __vdso_clock_gettime, __NR_clock_gettime +vdso_syscall2 __vdso_clock_gettime64, __NR_clock_gettime64 +vdso_syscall2 __vdso_clock_getres, __NR_clock_getres +vdso_syscall2 __vdso_gettimeofday, __NR_gettimeofday +vdso_syscall1 __vdso_time, __NR_time +vdso_syscall3 __vdso_getcpu, __NR_gettimeofday + +/* + * Signal return handlers. + */ + + .cfi_startproc simple + .cfi_signal_frame + +/* + * For convenience, put the cfa just above eip in sigcontext, and count + * offsets backward from there. Re-compute the cfa in the two contexts + * we have for signal unwinding. This is far simpler than the + * DW_CFA_expression form that the kernel uses, and is equally correct. + */ + + .cfi_def_cfa %esp, SIGFRAME_SIGCONTEXT_eip + 4 + + .cfi_offset %eip, -4 + /* err, -8 */ + /* trapno, -12 */ + .cfi_offset %eax, -16 + .cfi_offset %ecx, -20 + .cfi_offset %edx, -24 + .cfi_offset %ebx, -28 + .cfi_offset %esp, -32 + .cfi_offset %ebp, -36 + .cfi_offset %esi, -40 + .cfi_offset %edi, -44 + +/* + * While this frame is marked as a signal frame, that only applies to how + * the return address is handled for the outer frame. 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. + */ + nop + +__kernel_sigreturn: + popl %eax /* pop sig */ + .cfi_adjust_cfa_offset -4 + movl $__NR_sigreturn, %eax + int $0x80 +endf __kernel_sigreturn + + .cfi_def_cfa_offset RT_SIGFRAME_SIGCONTEXT_eip + 4 + nop + +__kernel_rt_sigreturn: + movl $__NR_rt_sigreturn, %eax + int $0x80 +endf __kernel_rt_sigreturn + + .cfi_endproc + +/* + * TODO: Add elf notes. E.g. + * + * #include <linux/elfnote.h> + * ELFNOTE_START(Linux, 0, "a") + * .long LINUX_VERSION_CODE + * ELFNOTE_END + * + * but what version number would we set for QEMU? + */ diff --git a/linux-user/i386/vdso.ld b/linux-user/i386/vdso.ld new file mode 100644 index 0000000000..326b7a8f98 --- /dev/null +++ b/linux-user/i386/vdso.ld @@ -0,0 +1,76 @@ +/* + * Linker script for linux i386 replacement vdso. + * + * Copyright 2023 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +ENTRY(__kernel_vsyscall) + +VERSION { + LINUX_2.6 { + global: + __vdso_clock_gettime; + __vdso_gettimeofday; + __vdso_time; + __vdso_clock_getres; + __vdso_clock_gettime64; + __vdso_getcpu; + }; + + LINUX_2.5 { + global: + __kernel_vsyscall; + __kernel_sigreturn; + __kernel_rt_sigreturn; + 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 =0x90909090 +} diff --git a/linux-user/i386/vdso.so b/linux-user/i386/vdso.so new file mode 100755 index 0000000000000000000000000000000000000000..bdece5dfcf8da036d013262d4e37208350283cfa
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1267 Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- linux-user/i386/vdso-asmoffset.h | 6 ++ linux-user/elfload.c | 19 +++- linux-user/i386/signal.c | 11 +++ linux-user/i386/Makefile.vdso | 11 +++ linux-user/i386/meson.build | 7 ++ linux-user/i386/vdso.S | 143 +++++++++++++++++++++++++++++++ linux-user/i386/vdso.ld | 76 ++++++++++++++++ linux-user/i386/vdso.so | Bin 0 -> 2672 bytes 8 files changed, 271 insertions(+), 2 deletions(-) create mode 100644 linux-user/i386/vdso-asmoffset.h create mode 100644 linux-user/i386/Makefile.vdso create mode 100644 linux-user/i386/vdso.S create mode 100644 linux-user/i386/vdso.ld create mode 100755 linux-user/i386/vdso.so GIT binary patch literal 2672 zcmbtWU1%It6u#5lG_z^4ZB?X_C>9o5sxCF8QBlyONt?nZ)?|y73e)ZGba%;SR(597 zjTXE8QIiHtY6YPbDhO>6s(mPS(FX(Z2Q`g?1xp_^KInr_=|f8&)b;yj=5}w=eGok1 z%XiMX=brmB_ny0ldSlx(O%qZAA|PnR8-(ZpuhYGj4)L&P5F5p65f&@qVw=PV(21ar zS~fT!zaSUUNMnr<D?qmul%W%{|IXi?lnz58hBiXBldmd>Kqu7p`(Ouv?E|~S#J4vR z?eBj&+ji~rg~eZ!zf~VSJr_pXM}D8DFrl0ORPzVHn5LKmbB!e|qzOC^tO77~@mIB) zzl6kpgPDI3e2U8d6uIY2bq_`x0-wZWxDMLSfe$J6M%crOeHivUY<@1rr@`l7bI!EC z1WQ>fZdBic@iW@_P1t@f_$4LZXEGSfcpH2f?e~Kj&v`Zj+$T!NBlkb|jQhnHeiL+a z&lJb<kCS@_*v@tHJTOn=lluBDy{$|iW0~jDvC(tlyVi??Q=2p0KUP})m@B{A^3Fp? z#y5Ta$e&ZC6Ayg2)jAG+!^M53FpOcdV3|2%)E={wiChkz(UhGxlDT|x*hrg>lO18$ z-OkRAyW9oSmOj5{et#-4CVgruv?pIJqQxKI&ZY~dQ!H3DSHUrA-dxrymL5+h95ZU? zqfdy~j)7gfjrM5g9c>HN9>C7<kIZ}NS==-4@5JK#YMzfafM=QF?WZPg6+aHhHu){t z#@l_<Z)3bX7g}rJnLgP3J~0HQz%PJH;3Rk&d;okNJPDowp8;P3e*#_ve+BLUI4(td zZBS?jb*;5I7#xS6XOVMV0Ql`GjNJ_U;OnA06ySNFpY!>?j(;zF-_-GQuCsOgock95 z$CvrnLFHO513c5BE36+~5f2BEAVM30`47nj^o(oe;NgZND~~oF)87oe)%5l%caD!C zZUR`#4&CABw}%(BE9KdV>yxiUf|Id`UI}64SIQGVslJnSd`)$H14yd$t+Ysc2<dgC zZ=Q@t)>OQ(J+srhD+k<&>B<F{@o$-65V!Wyt>HxRj<L>q5)uze70i3T0nE36-;4MD zX|P(C`eCbeVGnF6>~F$Q>&)x0)jBo>TdiYfVXJlMbJ%KKV=Y$enlO4^9_Z@du@yHB zwchCMGqw$O_4gWmJ%e{HQ)lfOF0TyrZnl4$<)z$G>%HU>FE1lXy;xFj>Xa70cGRgB zZe?<tMbsV}aT5E$PQl}h)U3Q?ifC%gN{nQau7X$*O<ToiCShkhk5lkGqh`U*=B*`$ zkrGieW9%;^Moc4<LZq}r)G<pAcKN?aE5cZ-d1tTskoO0sTmQ-H0oHh)quV~pVEQOL zf~-B80KOf}$M=_*fzCLdUB>YqcLID@7{~XU=z-4s6vh$lz%9JdjN|)G?1a8N?pfc* zIKKY`&zcmDP2m_-KOf(Hg0)2EV}IgBfWHx_^Y;P~hc5SkbEE79n459x?;V(~$T$m@ zjElobxDGGOT`N`AK*n(#-do~0bSZKjGMDr(AZ`H$D-74d^xS8@>$IiJAn|o+fMq_` OKQ-<Y4#gXF;{FA}h_Ctp literal 0 HcmV?d00001