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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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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
{