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arch/x86: (Intel64) move RAX to volatile register set

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This used to be part of the "restore always" set of registers because
__swap was expected to return a value.  No longer required, so RAX is
moved to the volatile registers and we save a few cycles occasionally.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-09-23 16:39:11 -04:00 • committed by Andrew Boie
commit 66a2ed2360
4 changed files with 4 additions and 4 deletions
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2
arch/x86/core/intel64/locore.S
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@ -222,12 +222,12 @@ __resume:
movq _thread_offset_to_r13(%rdi), %r13
movq _thread_offset_to_r14(%rdi), %r14
movq _thread_offset_to_r15(%rdi), %r15
movq _thread_offset_to_rax(%rdi), %rax
testb $X86_THREAD_FLAG_ALL, _thread_offset_to_flags(%rdi)
jz 1f
fxrstor _thread_offset_to_sse(%rdi)
movq _thread_offset_to_rax(%rdi), %rax
movq _thread_offset_to_rcx(%rdi), %rcx
movq _thread_offset_to_rdx(%rdi), %rdx
movq _thread_offset_to_rsi(%rdi), %rsi

2
arch/x86/core/offsets/intel64_offsets.c
View file

@ -16,8 +16,8 @@ GEN_OFFSET_SYM(_callee_saved_t, r14);
GEN_OFFSET_SYM(_callee_saved_t, r15);
GEN_OFFSET_SYM(_callee_saved_t, rip);
GEN_OFFSET_SYM(_callee_saved_t, rflags);
GEN_OFFSET_SYM(_callee_saved_t, rax);
GEN_OFFSET_SYM(_thread_arch_t, rax);
GEN_OFFSET_SYM(_thread_arch_t, rcx);
GEN_OFFSET_SYM(_thread_arch_t, rdx);
GEN_OFFSET_SYM(_thread_arch_t, rsi);

2
arch/x86/include/intel64/kernel_arch_thread.h
View file

@ -30,7 +30,6 @@ struct _callee_saved {
u64_t r15;
u64_t rip;
u64_t rflags;
u64_t rax;
};
typedef struct _callee_saved _callee_saved_t;
@ -38,6 +37,7 @@ typedef struct _callee_saved _callee_saved_t;
struct _thread_arch {
u8_t flags;
u64_t rax;
u64_t rcx;
u64_t rdx;
u64_t rsi;

2
arch/x86/include/intel64/offsets_short_arch.h
View file

@ -36,7 +36,7 @@
(___thread_t_callee_saved_OFFSET + ___callee_saved_t_rflags_OFFSET)
#define _thread_offset_to_rax \
(___thread_t_callee_saved_OFFSET + ___callee_saved_t_rax_OFFSET)
(___thread_t_arch_OFFSET + ___thread_arch_t_rax_OFFSET)
#define _thread_offset_to_rcx \
(___thread_t_arch_OFFSET + ___thread_arch_t_rcx_OFFSET)