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linux-user: Define ELF_ET_DYN_BASE in $guest/target_mman.h

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Copy each guest kernel's default value, then bound it
against reserved_va or the host address space.

Tested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-02 15:17:33 -07:00
parent 2d708164e0
commit da2b71fab6
23 changed files with 106 additions and 2 deletions
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3
linux-user/aarch64/target_mman.h
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@ -14,6 +14,9 @@
*/
#define TASK_UNMAPPED_BASE (1ull << (48 - 2))
/* arch/arm64/include/asm/elf.h */
#define ELF_ET_DYN_BASE TARGET_PAGE_ALIGN((1ull << 48) / 3 * 2)
#include "../generic/target_mman.h"
#endif

3
linux-user/alpha/target_mman.h
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@ -28,6 +28,9 @@
*/
#define TASK_UNMAPPED_BASE 0x20000000000ull
/* arch/alpha/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
#include "../generic/target_mman.h"
#endif

3
linux-user/arm/target_mman.h
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@ -6,4 +6,7 @@
*/
#define TASK_UNMAPPED_BASE 0x40000000
/* arch/arm/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0x00400000
#include "../generic/target_mman.h"

3
linux-user/cris/target_mman.h
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@ -7,4 +7,7 @@
*/
#define TASK_UNMAPPED_BASE TARGET_PAGE_ALIGN(0xb0000000 / 3)
/* arch/cris/include/uapi/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"

3
linux-user/hexagon/target_mman.h
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@ -8,4 +8,7 @@
*/
#define TASK_UNMAPPED_BASE 0x40000000
/* arch/hexagon/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0x08000000
#include "../generic/target_mman.h"

3
linux-user/hppa/target_mman.h
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@ -27,6 +27,9 @@
/* arch/parisc/include/asm/processor.h: DEFAULT_MAP_BASE32 */
#define TASK_UNMAPPED_BASE 0x40000000
/* arch/parisc/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x01000000)
#include "../generic/target_mman.h"
#endif

3
linux-user/i386/target_mman.h
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@ -11,4 +11,7 @@
*/
#define TASK_UNMAPPED_BASE 0x40000000
/* arch/x86/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0x00400000
#include "../generic/target_mman.h"

3
linux-user/loongarch64/target_mman.h
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@ -6,4 +6,7 @@
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1ull << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
/* arch/loongarch/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"

2
linux-user/m68k/target_mman.h
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@ -1,4 +1,6 @@
/* arch/m68k/include/asm/processor.h */
#define TASK_UNMAPPED_BASE 0xC0000000
/* arch/m68k/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0xD0000000
#include "../generic/target_mman.h"

15
linux-user/main.c
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@ -847,6 +847,21 @@ int main(int argc, char **argv, char **envp)
}
mmap_next_start = task_unmapped_base;
/* Similarly for elf_et_dyn_base. */
if (reserved_va) {
if (ELF_ET_DYN_BASE < reserved_va) {
elf_et_dyn_base = ELF_ET_DYN_BASE;
} else {
/* The most common default formula is TASK_SIZE / 3 * 2. */
elf_et_dyn_base = TARGET_PAGE_ALIGN(reserved_va / 3) * 2;
}
} else if (ELF_ET_DYN_BASE < UINTPTR_MAX) {
elf_et_dyn_base = ELF_ET_DYN_BASE;
} else {
/* 32-bit host: pick something medium size. */
elf_et_dyn_base = 0x18000000;
}
#pragma GCC diagnostic pop
{

3
linux-user/microblaze/target_mman.h
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@ -6,4 +6,7 @@
*/
#define TASK_UNMAPPED_BASE 0x48000000
/* arch/microblaze/include/uapi/asm/elf.h */
#define ELF_ET_DYN_BASE 0x08000000
#include "../generic/target_mman.h"

3
linux-user/mips/target_mman.h
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@ -21,6 +21,9 @@
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1ull << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
/* arch/mips/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"
#endif

1
linux-user/mmap.c
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@ -300,6 +300,7 @@ static bool mmap_frag(abi_ulong real_start, abi_ulong start, abi_ulong last,
}
abi_ulong task_unmapped_base;
abi_ulong elf_et_dyn_base;
abi_ulong mmap_next_start;
/*

3
linux-user/nios2/target_mman.h
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@ -5,4 +5,7 @@
*/
#define TASK_UNMAPPED_BASE TARGET_PAGE_ALIGN(0x7FFF0000 / 3)
/* arch/nios2/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0xD0000000
#include "../generic/target_mman.h"

3
linux-user/openrisc/target_mman.h
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@ -5,4 +5,7 @@
*/
#define TASK_UNMAPPED_BASE 0x30000000
/* arch/openrisc/include/asm/elf.h */
#define ELF_ET_DYN_BASE 0x08000000
#include "../generic/target_mman.h"

7
linux-user/ppc/target_mman.h
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@ -17,6 +17,13 @@
#define TASK_UNMAPPED_BASE 0x40000000
#endif
/* arch/powerpc/include/asm/elf.h */
#ifdef TARGET_PPC64
#define ELF_ET_DYN_BASE 0x100000000ull
#else
#define ELF_ET_DYN_BASE 0x000400000
#endif
#include "../generic/target_mman.h"
#endif

3
linux-user/riscv/target_mman.h
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@ -5,4 +5,7 @@
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1ull << (TARGET_VIRT_ADDR_SPACE_BITS - 1)) / 3)
/* arch/riscv/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"

10
linux-user/s390x/target_mman.h
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@ -8,4 +8,14 @@
*/
#define TASK_UNMAPPED_BASE (1ull << 41)
/*
* arch/s390/include/asm/elf.h:
* ELF_ET_DYN_BASE (STACK_TOP / 3 * 2) & ~((1UL << 32) - 1)
*
* arch/s390/include/asm/processor.h:
* STACK_TOP VDSO_LIMIT - VDSO_SIZE - PAGE_SIZE
* VDSO_LIMIT _REGION2_SIZE
*/
#define ELF_ET_DYN_BASE (((1ull << 42) / 3 * 2) & ~0xffffffffull)
#include "../generic/target_mman.h"

3
linux-user/sh4/target_mman.h
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@ -2,4 +2,7 @@
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1u << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
/* arch/sh/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"

11
linux-user/sparc/target_mman.h
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@ -19,6 +19,17 @@
#define TASK_UNMAPPED_BASE (1ull << (TARGET_VIRT_ADDR_SPACE_BITS - 2))
#endif
/*
* arch/sparc/include/asm/elf_64.h
* Except that COMPAT_ELF_ET_DYN_BASE exactly matches TASK_UNMAPPED_BASE,
* so move it up a bit.
*/
#ifdef TARGET_ABI32
#define ELF_ET_DYN_BASE 0x78000000
#else
#define ELF_ET_DYN_BASE 0x0000010000000000ull
#endif
#include "../generic/target_mman.h"
#endif

13
linux-user/user-mmap.h
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@ -25,10 +25,19 @@
* TASK_UNMAPPED_BASE: For mmap without hint (addr != 0), the search
* for unused virtual memory begins at TASK_UNMAPPED_BASE.
*
* task_unmapped_base: When the guest address space is limited via -R,
* the value of TASK_UNMAPPED_BASE is adjusted to fit.
* ELF_ET_DYN_BASE: When the executable is ET_DYN (i.e. PIE), and requires
* an interpreter (i.e. not -static-pie), use ELF_ET_DYN_BASE instead of
* TASK_UNMAPPED_BASE for selecting the address of the executable.
* This provides some distance between the executable and the interpreter,
* which allows the initial brk to be placed immediately after the
* executable and also have room to grow.
*
* task_unmapped_base, elf_et_dyn_base: When the guest address space is
* limited via -R, the values of TASK_UNMAPPED_BASE and ELF_ET_DYN_BASE
* must be adjusted to fit.
*/
extern abi_ulong task_unmapped_base;
extern abi_ulong elf_et_dyn_base;
/*
* mmap_next_start: The base address for the next mmap without hint,

3
linux-user/x86_64/target_mman.h
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@ -10,4 +10,7 @@
#define TASK_UNMAPPED_BASE \
TARGET_PAGE_ALIGN((1ull << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
/* arch/x86/include/asm/elf.h */
#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE * 2)
#include "../generic/target_mman.h"

4
linux-user/xtensa/target_mman.h
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@ -20,6 +20,10 @@
*/
#define TASK_UNMAPPED_BASE (1u << (TARGET_VIRT_ADDR_SPACE_BITS - 1))
/* arch/xtensa/include/asm/elf.h */
#define ELF_ET_DYN_BASE \
TARGET_PAGE_ALIGN((1u << TARGET_VIRT_ADDR_SPACE_BITS) / 3)
#include "../generic/target_mman.h"
#endif