diff options
| -rw-r--r-- | linux-user/elfload.c | 30 | ||||
| -rw-r--r-- | linux-user/mmap.c | 64 | ||||
| -rw-r--r-- | linux-user/syscall.c | 20 | ||||
| -rw-r--r-- | linux-user/user-internals.h | 1 | ||||
| -rw-r--r-- | linux-user/user-mmap.h | 1 |
5 files changed, 92 insertions, 24 deletions
diff --git a/linux-user/elfload.c b/linux-user/elfload.c index f7eae357f4..163fc8a1ee 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -130,19 +130,6 @@ typedef abi_int target_pid_t; #ifdef TARGET_I386 -#define ELF_PLATFORM get_elf_platform() - -static const char *get_elf_platform(void) -{ - static char elf_platform[] = "i386"; - int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL); - if (family > 6) - family = 6; - if (family >= 3) - elf_platform[1] = '0' + family; - return elf_platform; -} - #define ELF_HWCAP get_elf_hwcap() static uint32_t get_elf_hwcap(void) @@ -158,6 +145,8 @@ static uint32_t get_elf_hwcap(void) #define ELF_CLASS ELFCLASS64 #define ELF_ARCH EM_X86_64 +#define ELF_PLATFORM "x86_64" + static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) { regs->rax = 0; @@ -221,6 +210,21 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en #define ELF_CLASS ELFCLASS32 #define ELF_ARCH EM_386 +#define ELF_PLATFORM get_elf_platform() + +static const char *get_elf_platform(void) +{ + static char elf_platform[] = "i386"; + int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL); + if (family > 6) { + family = 6; + } + if (family >= 3) { + elf_platform[1] = '0' + family; + } + return elf_platform; +} + static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) { diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 48e1373796..4e7a6be6ee 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -835,3 +835,67 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, mmap_unlock(); return new_addr; } + +static bool can_passthrough_madv_dontneed(abi_ulong start, abi_ulong end) +{ + ulong addr; + + if ((start | end) & ~qemu_host_page_mask) { + return false; + } + + for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) { + if (!(page_get_flags(addr) & PAGE_ANON)) { + return false; + } + } + + return true; +} + +abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice) +{ + abi_ulong len, end; + int ret = 0; + + if (start & ~TARGET_PAGE_MASK) { + return -TARGET_EINVAL; + } + len = TARGET_PAGE_ALIGN(len_in); + + if (len_in && !len) { + return -TARGET_EINVAL; + } + + end = start + len; + if (end < start) { + return -TARGET_EINVAL; + } + + if (end == start) { + return 0; + } + + if (!guest_range_valid_untagged(start, len)) { + return -TARGET_EINVAL; + } + + /* + * A straight passthrough may not be safe because qemu sometimes turns + * private file-backed mappings into anonymous mappings. + * + * This is a hint, so ignoring and returning success is ok. + * + * This breaks MADV_DONTNEED, completely implementing which is quite + * complicated. However, there is one low-hanging fruit: host-page-aligned + * anonymous mappings. In this case passthrough is safe, so do it. + */ + mmap_lock(); + if ((advice & MADV_DONTNEED) && + can_passthrough_madv_dontneed(start, end)) { + ret = get_errno(madvise(g2h_untagged(start), len, MADV_DONTNEED)); + } + mmap_unlock(); + + return ret; +} diff --git a/linux-user/syscall.c b/linux-user/syscall.c index f55cdebee5..669add74c1 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -320,9 +320,6 @@ _syscall3(int,sys_syslog,int,type,char*,bufp,int,len) #ifdef __NR_exit_group _syscall1(int,exit_group,int,error_code) #endif -#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address) -_syscall1(int,set_tid_address,int *,tidptr) -#endif #if defined(__NR_futex) _syscall6(int,sys_futex,int *,uaddr,int,op,int,val, const struct timespec *,timeout,int *,uaddr2,int,val3) @@ -538,7 +535,7 @@ static inline int target_to_host_errno(int target_errno) } } -static inline abi_long get_errno(abi_long ret) +abi_long get_errno(abi_long ret) { if (ret == -1) return -host_to_target_errno(errno); @@ -11807,11 +11804,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1, #ifdef TARGET_NR_madvise case TARGET_NR_madvise: - /* A straight passthrough may not be safe because qemu sometimes - turns private file-backed mappings into anonymous mappings. - This will break MADV_DONTNEED. - This is a hint, so ignoring and returning success is ok. */ - return 0; + return target_madvise(arg1, arg2, arg3); #endif #ifdef TARGET_NR_fcntl64 case TARGET_NR_fcntl64: @@ -12200,9 +12193,14 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1, } #endif -#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address) +#if defined(TARGET_NR_set_tid_address) case TARGET_NR_set_tid_address: - return get_errno(set_tid_address((int *)g2h(cpu, arg1))); + { + TaskState *ts = cpu->opaque; + ts->child_tidptr = arg1; + /* do not call host set_tid_address() syscall, instead return tid() */ + return get_errno(sys_gettid()); + } #endif case TARGET_NR_tkill: diff --git a/linux-user/user-internals.h b/linux-user/user-internals.h index 6175ce53db..0280e76add 100644 --- a/linux-user/user-internals.h +++ b/linux-user/user-internals.h @@ -65,6 +65,7 @@ abi_long do_syscall(CPUArchState *cpu_env, int num, abi_long arg1, abi_long arg8); extern __thread CPUState *thread_cpu; G_NORETURN void cpu_loop(CPUArchState *env); +abi_long get_errno(abi_long ret); const char *target_strerror(int err); int get_osversion(void); void init_qemu_uname_release(void); diff --git a/linux-user/user-mmap.h b/linux-user/user-mmap.h index d1dec99c02..480ce1c114 100644 --- a/linux-user/user-mmap.h +++ b/linux-user/user-mmap.h @@ -25,6 +25,7 @@ int target_munmap(abi_ulong start, abi_ulong len); abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, abi_ulong new_size, unsigned long flags, abi_ulong new_addr); +abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice); extern unsigned long last_brk; extern abi_ulong mmap_next_start; abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); |