diff options
Diffstat (limited to 'docs/re')
| -rw-r--r-- | docs/re/registers.txt | 18 | ||||
| -rw-r--r-- | docs/re/test_v_cmp.txt | 14 | ||||
| -rw-r--r-- | docs/re/x86_instruction_reference.txt | 1 |
3 files changed, 33 insertions, 0 deletions
diff --git a/docs/re/registers.txt b/docs/re/registers.txt new file mode 100644 index 0000000..c0a3fee --- /dev/null +++ b/docs/re/registers.txt @@ -0,0 +1,18 @@ +Register sizes / mappings +------------------------- + +The A register is used as an example + + MSB LSB + +--------+--------+--------+--------+--------+--------+--------+--------+ + | RAX | + +--------+--------+--------+--------+--------+--------+--------+--------+ + | EAX | + +--------+--------+--------+--------+ + | AX | + +--------+--------+ + | AH | AL | + +--------+--------+ + + +# TODO - calling conventions diff --git a/docs/re/test_v_cmp.txt b/docs/re/test_v_cmp.txt new file mode 100644 index 0000000..5a0c5af --- /dev/null +++ b/docs/re/test_v_cmp.txt @@ -0,0 +1,14 @@ +CMP subtracts operands and sets internal flags. Among these, it sets the +zero flag if the difference is zero (operands are equal). + +TEST sets the zero flag (ZF) when the result of the AND operation is zero. If +the two operands are equal, their bitwise AND is zero only when the operands +themselves are zero. TEST also sets the sign flag (SF) when the most +significant bit is set in the result, and the parity flag (PF) when the number +of set bits is even. + +JE (alias of JZ) tests the zero flag and jumps if it is set. This makes: +test eax, eax +je 0x1234 +equivalent to the C statement: +if (eax == 0) diff --git a/docs/re/x86_instruction_reference.txt b/docs/re/x86_instruction_reference.txt new file mode 100644 index 0000000..c90c64e --- /dev/null +++ b/docs/re/x86_instruction_reference.txt @@ -0,0 +1 @@ +https://en.wikipedia.org/wiki/X86_instruction_listings |