#
# Copyright 2017, Intel Corporation
#
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#
# mock_trampoline_table.S
#
# This is used as trampoline table in all asm_pattern tests. During
# patching, some memory is allocated close (in 2GB range) to the
# text segment being patched. The address where this memory is allocated
# can not be predicted, therefore instead of allocating memory, the test
# libraries have their own space for trampoline table.
# Using this method, it is very easy to predict the destination of jump
# instructions in a patched text segment, as this mock trampoline table
# is always at the same distance from the syscall instructions being patched.
# In an actual trampoline table, each syscall has an entry assigned, which
# only contains another trampoline jump (to a 64 bit address). This mock
# trampoline table has the same format, each mock entry has the same size as
# as such a trampoline jump would have. Since these patched syscalls are
# never executed in these low level tests, these jumps don't need to be
# real functioning jumps, thus their destination is ".space 8, 0" in all
# cases -- the only thing that matters, is to have these at predictable
# addresses.
.intel_syntax noprefix
.global trampoline_table;
.global trampoline_table_end;
.data
trampoline_table:
dst0: jmp [rip]
.space 8, 0
dst1: jmp [rip]
.space 8, 0
dst2: jmp [rip]
.space 8, 0
dst3: jmp [rip]
.space 8, 0
dst4: jmp [rip]
.space 8, 0
dst5: jmp [rip]
.space 8, 0
dst6: jmp [rip]
.space 8, 0
dst7: jmp [rip]
.space 8, 0
dst8: jmp [rip]
.space 8, 0
dst9: jmp [rip]
.space 8, 0
dst10: jmp [rip]
.space 8, 0
dst11: jmp [rip]
.space 8, 0
dst12: jmp [rip]
.space 8, 0
dst13: jmp [rip]
.space 8, 0
dst14: jmp [rip]
.space 8, 0
dst15: jmp [rip]
.space 8, 0
dst16: jmp [rip]
.space 8, 0
dst17: jmp [rip]
.space 8, 0
dst18: jmp [rip]
.space 8, 0
dst19: jmp [rip]
.space 8, 0
dst20: jmp [rip]
.space 8, 0
dst21: jmp [rip]
.space 8, 0
dst22: jmp [rip]
.space 8, 0
dst23: jmp [rip]
.space 8, 0
trampoline_table_end: