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linux-user/arm: Select vdso for be8 and be32 modes

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In be8 mode, instructions are little-endian.
In be32 mode, instructions are big-endian.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2333
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-11-13 08:59:54 -08:00
parent 180692a1a1
commit 95c9e2209c
5 changed files with 41 additions and 12 deletions
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9
linux-user/arm/Makefile.vdso
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@ -3,15 +3,18 @@ include $(BUILD_DIR)/tests/tcg/arm-linux-user/config-target.mak
SUBDIR = $(SRC_PATH)/linux-user/arm
VPATH += $(SUBDIR)
all: $(SUBDIR)/vdso-be.so $(SUBDIR)/vdso-le.so
all: $(SUBDIR)/vdso-be8.so $(SUBDIR)/vdso-be32.so $(SUBDIR)/vdso-le.so
# Adding -use-blx disables unneeded interworking without actually using blx.
LDFLAGS = -nostdlib -shared -Wl,-use-blx -Wl,-z,max-page-size=4096 \
-Wl,-h,linux-vdso.so.1 -Wl,--build-id=sha1 \
-Wl,--hash-style=both -Wl,-T,$(SUBDIR)/vdso.ld
$(SUBDIR)/vdso-be.so: vdso.S vdso.ld vdso-asmoffset.h
$(CC) -o $@ $(LDFLAGS) -mbig-endian $<
$(SUBDIR)/vdso-be8.so: vdso.S vdso.ld vdso-asmoffset.h
$(CC) -o $@ $(LDFLAGS) -mbig-endian -mbe8 $<
$(SUBDIR)/vdso-be32.so: vdso.S vdso.ld vdso-asmoffset.h
$(CC) -o $@ $(LDFLAGS) -mbig-endian -mbe32 $<
$(SUBDIR)/vdso-le.so: vdso.S vdso.ld vdso-asmoffset.h
$(CC) -o $@ $(LDFLAGS) -mlittle-endian $<

13
linux-user/arm/meson.build
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@ -10,10 +10,17 @@ syscall_nr_generators += {
# is always true as far as source_set.apply() is concerned. Always build
# both header files and include the right one via #if.
vdso_be_inc = gen_vdso.process('vdso-be.so',
extra_args: ['-s', 'sigreturn_codes'])
vdso_be8_inc = gen_vdso.process('vdso-be8.so',
extra_args: ['-s', 'sigreturn_codes',
'-p', 'vdso_be8'])
vdso_be32_inc = gen_vdso.process('vdso-be32.so',
extra_args: ['-s', 'sigreturn_codes',
'-p', 'vdso_be32'])
vdso_le_inc = gen_vdso.process('vdso-le.so',
extra_args: ['-s', 'sigreturn_codes'])
linux_user_ss.add(when: 'TARGET_ARM', if_true: [vdso_be_inc, vdso_le_inc])
linux_user_ss.add(when: 'TARGET_ARM', if_true: [
vdso_be8_inc, vdso_be32_inc, vdso_le_inc
])

BIN
linux-user/arm/vdso-be32.so Executable file
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BIN
linux-user/arm/vdso-be.so → linux-user/arm/vdso-be8.so
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31
linux-user/elfload.c
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@ -659,6 +659,23 @@ static const char *get_elf_platform(void)
#undef END
}
#if TARGET_BIG_ENDIAN
#include "elf.h"
#include "vdso-be8.c.inc"
#include "vdso-be32.c.inc"
static const VdsoImageInfo *vdso_image_info(uint32_t elf_flags)
{
return (EF_ARM_EABI_VERSION(elf_flags) >= EF_ARM_EABI_VER4
&& (elf_flags & EF_ARM_BE8)
? &vdso_be8_image_info
: &vdso_be32_image_info);
}
#define vdso_image_info vdso_image_info
#else
# define VDSO_HEADER "vdso-le.c.inc"
#endif
#else
/* 64 bit ARM definitions */
@ -958,14 +975,14 @@ const char *elf_hwcap2_str(uint32_t bit)
#undef GET_FEATURE_ID
#endif /* not TARGET_AARCH64 */
#if TARGET_BIG_ENDIAN
# define VDSO_HEADER "vdso-be.c.inc"
#else
# define VDSO_HEADER "vdso-le.c.inc"
#endif
#endif /* not TARGET_AARCH64 */
#endif /* TARGET_ARM */
#ifdef TARGET_SPARC
@ -3524,12 +3541,14 @@ static void load_elf_interp(const char *filename, struct image_info *info,
load_elf_image(filename, &src, info, &ehdr, NULL);
}
#ifndef vdso_image_info
#ifdef VDSO_HEADER
#include VDSO_HEADER
#define vdso_image_info() &vdso_image_info
#define vdso_image_info(flags) &vdso_image_info
#else
#define vdso_image_info() NULL
#endif
#define vdso_image_info(flags) NULL
#endif /* VDSO_HEADER */
#endif /* vdso_image_info */
static void load_elf_vdso(struct image_info *info, const VdsoImageInfo *vdso)
{
@ -3860,7 +3879,7 @@ int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
* Load a vdso if available, which will amongst other things contain the
* signal trampolines. Otherwise, allocate a separate page for them.
*/
const VdsoImageInfo *vdso = vdso_image_info();
const VdsoImageInfo *vdso = vdso_image_info(info->elf_flags);
if (vdso) {
load_elf_vdso(&vdso_info, vdso);
info->vdso = vdso_info.load_bias;