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[PATCH] Add some comments to entry.S

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And remove some old obsolete ones.
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:29 +02:00 committed by Andi Kleen
parent 107878bb14
commit 2e91a17b35
1 changed files with 15 additions and 3 deletions
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18
arch/x86_64/kernel/entry.S
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@ -22,9 +22,21 @@
* at the top of the kernel process stack. * at the top of the kernel process stack.
* - partial stack frame: partially saved registers upto R11. * - partial stack frame: partially saved registers upto R11.
* - full stack frame: Like partial stack frame, but all register saved. * - full stack frame: Like partial stack frame, but all register saved.
* *
* TODO: * Some macro usage:
* - schedule it carefully for the final hardware. * - CFI macros are used to generate dwarf2 unwind information for better
* backtraces. They don't change any code.
* - SAVE_ALL/RESTORE_ALL - Save/restore all registers
* - SAVE_ARGS/RESTORE_ARGS - Save/restore registers that C functions modify.
* There are unfortunately lots of special cases where some registers
* not touched. The macro is a big mess that should be cleaned up.
* - SAVE_REST/RESTORE_REST - Handle the registers not saved by SAVE_ARGS.
* Gives a full stack frame.
* - ENTRY/END Define functions in the symbol table.
* - FIXUP_TOP_OF_STACK/RESTORE_TOP_OF_STACK - Fix up the hardware stack
* frame that is otherwise undefined after a SYSCALL
* - TRACE_IRQ_* - Trace hard interrupt state for lock debugging.
* - errorentry/paranoidentry/zeroentry - Define exception entry points.
*/ */
#include <linux/linkage.h> #include <linux/linkage.h>