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| author | Andi Kleen <ak@suse.de> | 2006-09-26 08:52:29 (GMT) |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 08:52:29 (GMT) |
| commit | 2e91a17b35116885373e04af142b1d08cf1b47bf (patch) | |
| tree | d409c8029d3ffc9f4a3ee739cf09ef566adc6610 | |
| parent | 107878bb14b1fb6bddc646f4d5e72e8beaa2f6a2 (diff) | |
| download | linux-2e91a17b35116885373e04af142b1d08cf1b47bf.tar.xz | |
[PATCH] Add some comments to entry.S
And remove some old obsolete ones.
Signed-off-by: Andi Kleen <ak@suse.de>
| -rw-r--r-- | arch/x86_64/kernel/entry.S | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S index a0cf36b..a04fc41 100644 --- a/arch/x86_64/kernel/entry.S +++ b/arch/x86_64/kernel/entry.S @@ -22,9 +22,21 @@ * at the top of the kernel process stack. * - partial stack frame: partially saved registers upto R11. * - full stack frame: Like partial stack frame, but all register saved. - * - * TODO: - * - schedule it carefully for the final hardware. + * + * Some macro usage: + * - 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> |