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x86 asm: move most of registers from x86-assembly-cheat

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Ciro Santilli 六四事件 法轮功
2019-06-22 00:00:03 +00:00
parent fd5b62edfe
commit 8efd4f8a43
2 changed files with 104 additions and 2 deletions
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56
userland/arch/x86_64/registers.S Normal file
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/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-registers */
#include <lkmc.h>
LKMC_PROLOGUE
/* All the 16 general purpose registers. */
mov $0x0, %rax
mov $0x0, %rcx
mov $0x0, %rdx
mov $0x0, %rbx
#if 0
/* We don't want to do touch those because if affets our main call stack. */
mov $0x0, %rbp
mov $0x0, %rsp
#endif
mov $0x0, %rsi
mov $0x0, %rdi
mov $0x0, %r8
mov $0x0, %r9
mov $0x0, %r10
mov $0x0, %r11
mov $0x0, %r12
mov $0x0, %r13
mov $0x0, %r14
mov $0x0, %r15
/* EAX and AX. */
mov $0x11111111, %eax
mov $0x2222, %ax
LKMC_ASSERT_EQ_32(%eax, $0x11112222)
/* EAX, AL and AH. */
mov $0x11111111, %eax
mov $0x22, %ah
mov $0x33, %al
LKMC_ASSERT_EQ_32(%eax, $0x11112233)
/* R12D, R12W and R12B */
mov $0x11111111, %r12d
mov $0x2222, %r12w
mov $0x33, %r12b
LKMC_ASSERT_EQ_32(%r12d, $0x11112233)
#if 0
/* There is no R12H: the second byte is only addressable on the old registers.
* Error: bad register name `%r12h' */
mov $0x22, %r12h
#endif
/* Keep in mind that most 32-bit register instructions zero out the top bits of RAX!
* https://stackoverflow.com/questions/11177137/why-do-x86-64-instructions-on-32-bit-registers-zero-the-upper-part-of-the-full-6 */
mov $0x1122334455667788, %r12
LKMC_ASSERT_EQ_32(%r12d, $0x55667788)
mov $0x99AABBCC, %r12
LKMC_ASSERT_EQ(%r12, $0x0000000099AABBCC)
LKMC_EPILOGUE