Process Initialization

jsix follows the System V ABI on the amd64 architecture. All arguments needed for program initialization are passed to the program’s initial thread on the stack.

Note that jsix adds a number of additional auxiliary vector entry types for passing jsix-specific data to a program. The jsix-specific auxiliary vector type codes (what the ABI document refers to as a_type) start from 0xf000. See the header file <j6/init.h> for more detail.

The initial stack frame

Address	Value	Bytes	Notes
top			Stack top (out of stack bounds)
top - 16	0	16	Stack sentinel
	envp string data	?
	argv string data	?
	…	?	Possible padding
	0, 0 (AT_NULL)	16	Aux vector sentinel
	Aux vectors	16 * m	AT_NULL-terminated array of Aux vectors
	0	8	Environment sentinel
	envp	8 * n	0-terminated array of environment string pointers
	0	8	Args sentinel
	argv	8 * argc	Pointers to argument strings
rsp	argc	8	Number of elements in argv

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