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wibo/src/setup.S

327 lines
6.2 KiB
ArmAsm
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#include "macros.S"
.text
#ifdef __APPLE__
.zerofill RESV32, RESV32, _wibo_reserve, 0x7E000000 - 0x1000
.no_dead_strip _wibo_reserve
#endif
#if defined(__x86_64__) && defined(__linux__)
# int tebThreadSetup(int entryNumber, TEB *teb)
ASM_GLOBAL(tebThreadSetup, @function)
push rbx # save rbx
mov r8, rsp # save host stack
rdfsbase r9 # read host FS base
mov rdx, qword ptr [rsi+TEB_SP] # fetch guest stack
LJMP32 rsi # far jump into 32-bit code
mov ax, 0x2b # user data segment (Linux)
mov ds, ax # setup data segment
mov es, ax # setup extra segment
mov esp, edx # switch to guest stack
sub esp, 0x10 # sizeof(user_desc)
mov dword ptr [esp], edi # entry_number (arg 0)
mov dword ptr [esp+4], esi # base_addr (arg 1)
mov dword ptr [esp+8], 0xffff # limit
mov dword ptr [esp+12], 0x41 # seg_32bit | usable
mov ebx, esp # &user_desc
mov eax, 0xf3 # SYS_set_thread_area
int 0x80 # syscall
test eax, eax # check for error
jnz 1f # skip selector setup
mov eax, dword ptr [esp] # entry_number
cmp eax, -1 # check for invalid entry_number
jz 2f # skip selector setup
lea ebx, [eax*8+3] # create selector
mov fs, bx # setup fs segment
mov word ptr [esi+TEB_FS_SEL], bx # save selector
jmp 2f # skip error handling
1:
mov eax, -1 # return -1
2:
add esp, 0x10 # cleanup stack
LJMP64 esi # far jump into 64-bit code
cdqe # sign-extend eax to rax
mov rsp, r8 # switch to host stack
wrfsbase r9 # restore host FS base
pop rbx # restore rbx
ret
ASM_END(tebThreadSetup)
#endif // __x86_64__
.code32
.macro stubThunkX number
#if defined(__x86_64__)
#define STUB_THUNK_SYMBOL _Z9stubThunkILm\()\number\()EEvv
ASM_GLOBAL(STUB_THUNK_SYMBOL, @function)
#else
#define STUB_THUNK_SYMBOL _Z9stubThunkILj\()\number\()EEvv
ASM_GLOBAL(STUB_THUNK_SYMBOL, @function)
#endif
pop eax
push \number
push eax
jmp SYMBOL_NAME(thunk_entry_stubBase)
ASM_END(STUB_THUNK_SYMBOL)
.endm
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