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linux-user: Fix syscall parameter handling for MIPS n32

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The MIPS n32 ABI is basically n64 with the address space (i.e. pointer
width) shrinked to 32 bits. Meanwhile the current code treats it as
o32-like based on TARGET_ABI_BITS, which causes problems with n32
syscalls utilizing 64-bit offsets, like pread64, affecting most (if not
all) recently built n32 binaries.

This partially solves issue #909 ("qemu-mipsn32(el) user mode emulator
fails to execute any recently built n32 binaries"); with this change
applied, the built qemu-mipsn32el is able to progress beyond the
pread64, and finish _dl_start_user for the "getting ld.so load libc.so"
case. The program later dies with SIGBUS, though, due to _dl_start_user
not maintaining stack alignment after removing ld.so itself from argv,
and qemu-user starting to enforce alignment recently, but that is
orthogonal to the issue here; the more common case of chrooting is
working, verified with my own-built Gentoo n32 sysroot. (Depending on
the exact ISA used, one may have to explicitly specify QEMU_CPU, which
is the case for my chroot.)

Buglink: https://gitlab.com/qemu-project/qemu/-/issues/909
Signed-off-by: WANG Xuerui <xen0n@gentoo.org>
Cc: Laurent Vivier <laurent@vivier.eu>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Andreas K. Hüttel <dilfridge@gentoo.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220320052259.1610883-1-xen0n@gentoo.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
WANG Xuerui 2022-03-20 13:22:59 +08:00 committed by Laurent Vivier
parent 48fb0a826e
commit 80f0fe3a85
1 changed files with 3 additions and 3 deletions
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6
linux-user/user-internals.h
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@ -112,7 +112,7 @@ static inline int is_error(abi_long ret)
return (abi_ulong)ret >= (abi_ulong)(-4096);
}
#if TARGET_ABI_BITS == 32
#if (TARGET_ABI_BITS == 32) && !defined(TARGET_ABI_MIPSN32)
static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
{
#ifdef TARGET_WORDS_BIGENDIAN
@ -121,7 +121,7 @@ static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
return ((uint64_t)word1 << 32) | word0;
#endif
}
#else /* TARGET_ABI_BITS == 32 */
#else /* TARGET_ABI_BITS == 32 && !defined(TARGET_ABI_MIPSN32) */
static inline uint64_t target_offset64(uint64_t word0, uint64_t word1)
{
return word0;
@ -136,7 +136,7 @@ static inline int regpairs_aligned(void *cpu_env, int num)
{
return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
}
#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32)
#elif defined(TARGET_MIPS) && defined(TARGET_ABI_MIPSO32)
static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
/*