06-20-2018
FWIW - on an x86-based server, processes running in 32-bit mode have access to eight 32-bit general purpose registers, three of which are PC (program counter), SP (stack pointer), and FP (frame pointer). So, unless the compilation process includes optimizations like '-fomit-frame-pointer', the process gets all of five general-purpose registers.
In 64-bit mode, processing have access to sixteen 64-bit general-purpose registers.
So an unoptimized 32-bit process gets to actually use five 32-bit registers, and an optimized 64-bit process gets to actually use fourteen 64-bit registers.
Guess which one's faster on the exact same hardware. ;-)
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LEARN ABOUT HPUX
uwx_step
uwx_step(3X) uwx_step(3X)
NAME
uwx_step() - step one frame
SYNOPSIS
DESCRIPTION
is part of the Unwind Express Library for Integrity systems; see uwx(3X). steps back one frame from the current context and updates the
context to reflect the state of the new frame. The return pointer becomes the new IP (instruction pointer), the previous stack pointer
becomes the new stack pointer, the backing store pointer is adjusted to point to the previous frame's registers, the previous frame state
becomes the new current frame marker, and all preserved registers are updated with the values they had in that frame. (If has been used to
disable floating-point register tracking, the preserved floating-point registers will not be updated.)
Parameters
env A pointer to an unwind environment object.
RETURN VALUE
returns on success. If the current frame is at the bottom of the call stack, it returns and the current context is unchanged. If the cur-
rent frame is a signal frame (or some other ABI-dependent context frame), it returns and the current context is unchanged. All other sta-
tus codes indicate errors; see uwx(3X) for error codes.
AUTHOR
The Unwind Express Library was developed by Hewlett-Packard.
SEE ALSO
uwx(3X), uwx_add_to_bsp(3X), uwx_find_source_info(3X), uwx_find_symbol(3X), uwx_free(3X), uwx_get_abi_context_code(3X), uwx_get_func-
start(3X), uwx_get_module_info(3X), uwx_get_nat(3X), uwx_get_reg(3X), uwx_get_source_info(3X), uwx_get_sym_info(3X), uwx_init(3X),
uwx_init_context(3X), uwx_register_alloc_cb(3X), uwx_register_callbacks(3X), uwx_release_symbol_cache(3X), uwx_self_do_context_frame(3X),
uwx_self_free_info(3X), uwx_self_init_context(3X), uwx_self_init_info(3X), uwx_set_nofr(3X), uwx_set_remote(3X), uwx_step_inline(3X).
Integrity Systems Only uwx_step(3X)