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linux-user: Introduce stubs for ELF AT_BASE_PLATFORM

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AT_BASE_PLATFORM is a elf auxiliary vector pointing to a string
to pass some architecture information.
See getauxval(3) man-page.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220803103009.95972-2-jiaxun.yang@flygoat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Jiaxun Yang 2022-08-03 11:30:08 +01:00 committed by Laurent Vivier
parent 2941e0fa05
commit fcdc0ab4b4
1 changed files with 27 additions and 2 deletions
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29
linux-user/elfload.c
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@ -1776,6 +1776,10 @@ static inline void init_thread(struct target_pt_regs *regs,
#endif /* TARGET_HEXAGON */
#ifndef ELF_BASE_PLATFORM
#define ELF_BASE_PLATFORM (NULL)
#endif
#ifndef ELF_PLATFORM
#define ELF_PLATFORM (NULL)
#endif
@ -2220,8 +2224,8 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
int i;
abi_ulong u_rand_bytes;
uint8_t k_rand_bytes[16];
abi_ulong u_platform;
const char *k_platform;
abi_ulong u_platform, u_base_platform;
const char *k_platform, *k_base_platform;
const int n = sizeof(elf_addr_t);
sp = p;
@ -2243,6 +2247,22 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
}
}
u_base_platform = 0;
k_base_platform = ELF_BASE_PLATFORM;
if (k_base_platform) {
size_t len = strlen(k_base_platform) + 1;
if (STACK_GROWS_DOWN) {
sp -= (len + n - 1) & ~(n - 1);
u_base_platform = sp;
/* FIXME - check return value of memcpy_to_target() for failure */
memcpy_to_target(sp, k_base_platform, len);
} else {
memcpy_to_target(sp, k_base_platform, len);
u_base_platform = sp;
sp += len + 1;
}
}
u_platform = 0;
k_platform = ELF_PLATFORM;
if (k_platform) {
@ -2284,6 +2304,8 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
}
size = (DLINFO_ITEMS + 1) * 2;
if (k_base_platform)
size += 2;
if (k_platform)
size += 2;
#ifdef DLINFO_ARCH_ITEMS
@ -2361,6 +2383,9 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
#endif
if (u_base_platform) {
NEW_AUX_ENT(AT_BASE_PLATFORM, u_base_platform);
}
if (u_platform) {
NEW_AUX_ENT(AT_PLATFORM, u_platform);
}