X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/8f6c56a50524aa785f7e596d52dddfb331e18961..db6096698656d32db7df630594bd9617ee54f828:/osfmk/i386/ldt.c?ds=sidebyside diff --git a/osfmk/i386/ldt.c b/osfmk/i386/ldt.c index e2d0ee1c2..ff1facd34 100644 --- a/osfmk/i386/ldt.c +++ b/osfmk/i386/ldt.c @@ -57,54 +57,49 @@ */ /* - * "Local" descriptor table. At the moment, all tasks use the + * "Local" descriptor table. At the moment, all tasks use the * same LDT. */ #include -#include -#include -#include -extern int syscall(void); -extern int mach_rpc(void); - -struct fake_descriptor ldt[LDTSZ] = { -/*007*/ { (unsigned int)&syscall, - KERNEL_CS, - 0, /* no parameters */ - ACC_P|ACC_PL_U|ACC_CALL_GATE - }, /* call gate for system calls */ -/*00F*/ { (unsigned int)&mach_rpc, - KERNEL_CS, - 0, /* no parameters */ - ACC_P|ACC_PL_U|ACC_CALL_GATE - }, /* call gate for mach rpc */ -/*017*/ { 0, - 0xfffff, - SZ_32|SZ_G, - ACC_P|ACC_PL_U|ACC_CODE_R - }, /* user code segment */ -/*01F*/ { 0, - 0xfffff, - SZ_32|SZ_G, - ACC_P|ACC_PL_U|ACC_DATA_W - }, /* user data segment */ -/*027*/ { 0, - 0xfffff, - SZ_32|SZ_G, - ACC_P|ACC_PL_U|ACC_DATA_W - }, /* user cthread segment */ -// Storage space for user ldt entries we will make room for 10 entries initially -// as we will probably never need many more than that -/*02F*/ { 0, 0, 0, 0}, -/*037*/ { 0, 0, 0, 0}, -/*03F*/ { 0, 0, 0, 0}, -/*047*/ { 0, 0, 0, 0}, -/*04F*/ { 0, 0, 0, 0}, -/*057*/ { 0, 0, 0, 0}, -/*05F*/ { 0, 0, 0, 0}, -/*067*/ { 0, 0, 0, 0}, -/*06F*/ { 0, 0, 0, 0}, -/*077*/ { 0, 0, 0, 0}, +struct real_descriptor master_ldt[LDTSZ] __attribute__ ((aligned (4096))) = { +#ifdef __i386__ + [SEL_TO_INDEX(SYSENTER_CS)] = MAKE_REAL_DESCRIPTOR( /* kernel code (sysenter) */ + 0, + 0xfffff, + SZ_32|SZ_G, + ACC_P|ACC_PL_K|ACC_CODE_R + ), + [SEL_TO_INDEX(SYSENTER_DS)] = MAKE_REAL_DESCRIPTOR( /* kernel data (sysenter) */ + 0, + 0xfffff, + SZ_32|SZ_G, + ACC_P|ACC_PL_K|ACC_DATA_W + ), + [SEL_TO_INDEX(USER_CS)] = MAKE_REAL_DESCRIPTOR( /* user code segment */ + 0, + 0xfffff, + SZ_32|SZ_G, + ACC_P|ACC_PL_U|ACC_CODE_R + ), + [SEL_TO_INDEX(USER_DS)] = MAKE_REAL_DESCRIPTOR( /* user data segment */ + 0, + 0xfffff, + SZ_32|SZ_G, + ACC_P|ACC_PL_U|ACC_DATA_W + ), + [SEL_TO_INDEX(USER64_CS)] = MAKE_REAL_DESCRIPTOR( /* user 64-bit code segment */ + 0, + 0xfffff, + SZ_64|SZ_G, + ACC_P|ACC_PL_U|ACC_CODE_R + ), +#endif + [SEL_TO_INDEX(USER_CTHREAD)] = MAKE_REAL_DESCRIPTOR( /* user cthread segment */ + 0, + 0xfffff, + SZ_32|SZ_G, + ACC_P|ACC_PL_U|ACC_DATA_W + ), };