Brendan Shanks : ntdll: Set up 32-bit segments to support Wow64 on macOS 10.15+.
Module: wine Branch: master Commit: 93c5353ee7a9813b63eb117b84fba7b1616da59c URL: https://source.winehq.org/git/wine.git/?a=commit;h=93c5353ee7a9813b63eb117b8... Author: Brendan Shanks <bshanks(a)codeweavers.com> Date: Fri May 13 15:26:23 2022 -0700 ntdll: Set up 32-bit segments to support Wow64 on macOS 10.15+. Signed-off-by: Brendan Shanks <bshanks(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- dlls/ntdll/unix/signal_x86_64.c | 132 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 130 insertions(+), 2 deletions(-) diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index 703f46b0d4e..e3179e2f1b0 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -208,6 +208,8 @@ __ASM_GLOBAL_FUNC( alloc_fs_sel, #elif defined (__APPLE__) +#include <i386/user_ldt.h> + #define RAX_sig(context) ((context)->uc_mcontext->__ss.__rax) #define RBX_sig(context) ((context)->uc_mcontext->__ss.__rbx) #define RCX_sig(context) ((context)->uc_mcontext->__ss.__rcx) @@ -2833,6 +2835,80 @@ static void usr1_handler( int signal, siginfo_t *siginfo, void *ucontext ) } +/*********************************************************************** + * LDT support + */ + +#define LDT_SIZE 8192 + +#define LDT_FLAGS_DATA 0x13 /* Data segment */ +#define LDT_FLAGS_CODE 0x1b /* Code segment */ +#define LDT_FLAGS_32BIT 0x40 /* Segment is 32-bit (code or stack) */ +#define LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated */ + +static ULONG first_ldt_entry = 32; + +struct ldt_copy +{ + void *base[LDT_SIZE]; + unsigned int limit[LDT_SIZE]; + unsigned char flags[LDT_SIZE]; +} __wine_ldt_copy; + +static pthread_mutex_t ldt_mutex = PTHREAD_MUTEX_INITIALIZER; + +static inline void *ldt_get_base( LDT_ENTRY ent ) +{ + return (void *)(ent.BaseLow | + (ULONG_PTR)ent.HighWord.Bits.BaseMid << 16 | + (ULONG_PTR)ent.HighWord.Bits.BaseHi << 24); +} + +static inline unsigned int ldt_get_limit( LDT_ENTRY ent ) +{ + unsigned int limit = ent.LimitLow | (ent.HighWord.Bits.LimitHi << 16); + if (ent.HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff; + return limit; +} + +static LDT_ENTRY ldt_make_entry( void *base, unsigned int limit, unsigned char flags ) +{ + LDT_ENTRY entry; + + entry.BaseLow = (WORD)(ULONG_PTR)base; + entry.HighWord.Bits.BaseMid = (BYTE)((ULONG_PTR)base >> 16); + entry.HighWord.Bits.BaseHi = (BYTE)((ULONG_PTR)base >> 24); + if ((entry.HighWord.Bits.Granularity = (limit >= 0x100000))) limit >>= 12; + entry.LimitLow = (WORD)limit; + entry.HighWord.Bits.LimitHi = limit >> 16; + entry.HighWord.Bits.Dpl = 3; + entry.HighWord.Bits.Pres = 1; + entry.HighWord.Bits.Type = flags; + entry.HighWord.Bits.Sys = 0; + entry.HighWord.Bits.Reserved_0 = 0; + entry.HighWord.Bits.Default_Big = (flags & LDT_FLAGS_32BIT) != 0; + return entry; +} + +static void ldt_set_entry( WORD sel, LDT_ENTRY entry ) +{ + int index = sel >> 3; + +#if defined(__APPLE__) + if (i386_set_ldt(index, (union ldt_entry *)&entry, 1) < 0) perror("i386_set_ldt"); +#else + fprintf( stderr, "No LDT support on this platform\n" ); + exit(1); +#endif + + __wine_ldt_copy.base[index] = ldt_get_base( entry ); + __wine_ldt_copy.limit[index] = ldt_get_limit( entry ); + __wine_ldt_copy.flags[index] = (entry.HighWord.Bits.Type | + (entry.HighWord.Bits.Default_Big ? LDT_FLAGS_32BIT : 0) | + LDT_FLAGS_ALLOCATED); +} + + /********************************************************************** * get_thread_ldt_entry */ @@ -2871,8 +2947,25 @@ NTSTATUS signal_alloc_thread( TEB *teb ) if (teb->WowTebOffset) { - if (fs32_sel) - thread_data->fs = fs32_sel; + if (!fs32_sel) + { + void *teb32 = (char *)teb + teb->WowTebOffset; + sigset_t sigset; + int idx; + LDT_ENTRY entry = ldt_make_entry( teb32, page_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT ); + + server_enter_uninterrupted_section( &ldt_mutex, &sigset ); + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + ldt_set_entry( (idx << 3) | 7, entry ); + break; + } + server_leave_uninterrupted_section( &ldt_mutex, &sigset ); + if (idx == LDT_SIZE) return STATUS_TOO_MANY_THREADS; + thread_data->fs = (idx << 3) | 7; + } + else thread_data->fs = fs32_sel; } return STATUS_SUCCESS; } @@ -2883,6 +2976,15 @@ NTSTATUS signal_alloc_thread( TEB *teb ) */ void signal_free_thread( TEB *teb ) { + struct amd64_thread_data *thread_data = (struct amd64_thread_data *)&teb->GdiTebBatch; + sigset_t sigset; + + if (teb->WowTebOffset && !fs32_sel) + { + server_enter_uninterrupted_section( &ldt_mutex, &sigset ); + __wine_ldt_copy.flags[thread_data->fs >> 3] = 0; + server_leave_uninterrupted_section( &ldt_mutex, &sigset ); + } } #ifdef __APPLE__ @@ -3012,6 +3114,32 @@ void signal_init_process(void) } else ERR_(seh)( "failed to allocate %%fs selector\n" ); } +#elif defined(__APPLE__) + if (NtCurrentTeb()->WowTebOffset) + { + void *teb32 = (char *)NtCurrentTeb() + NtCurrentTeb()->WowTebOffset; + LDT_ENTRY cs32_entry, fs32_entry; + int idx; + + cs32_entry = ldt_make_entry( NULL, -1, LDT_FLAGS_CODE | LDT_FLAGS_32BIT ); + fs32_entry = ldt_make_entry( teb32, page_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT ); + + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + cs32_sel = (idx << 3) | 7; + ldt_set_entry( cs32_sel, cs32_entry ); + break; + } + + for (idx = first_ldt_entry; idx < LDT_SIZE; idx++) + { + if (__wine_ldt_copy.flags[idx]) continue; + amd64_thread_data()->fs = (idx << 3) | 7; + ldt_set_entry( amd64_thread_data()->fs, fs32_entry ); + break; + } + } #endif sig_act.sa_mask = server_block_set;
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Alexandre Julliard