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amd64 la57_trampoline: save registers in memory 

AMD64 ARM states that 64bit part of the architectural state is undefined
after 32<->64 mode switching.

Sponsored by:	Advanced Micro Devices (AMD)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2024-09-12 08:43:44 +03:00
parent 687b896f8e
commit 280e50461a
1 changed files with 12 additions and 9 deletions
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21
sys/amd64/amd64/locore.S
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@ -91,11 +91,12 @@ ENTRY(btext)
/* la57_trampoline(%rdi pml5) */
ENTRY(la57_trampoline)
movq %rsp,%r11
movq %rbx,%r10
movq %rbp,%r9
movq %cr4,%r8
orl $CR4_LA57,%r8d
movq %rsp,lst(%rip)
movq %rbx,lst+8(%rip)
movq %rbp,lst+0x10(%rip)
movq %cr4,%rax
orq $CR4_LA57,%rax
movq %rax,lst+0x18(%rip)
leaq la57_trampoline_end(%rip),%rsp
movq %cr0,%rbp
@ -143,12 +144,14 @@ l1: movl $(3<<3),%eax
lretl
.code64
l2: movq %r11,%rsp
movq %r10,%rbx
movq %r9,%rbp
movq %r8,%cr4
l2: movq lst(%rip),%rsp
movq lst+8(%rip),%rbx
movq lst+0x10(%rip),%rbp
movq lst+0x18(%rip),%rax
movq %rax,%cr4
retq
.p2align 4,0
lst: .quad 0,0,0,0
ENTRY(la57_trampoline_gdt_desc)
.word la57_trampoline_end - la57_trampoline_gdt
.long 0, 0 /* filled by pmap_bootstrap_la57 */