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* grub-core/lib/x86_64/xen/relocator.S: Fix hypercall ABI violation.

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GRUB relied on %rdi being preserved across hypercall which isn't true.
This commit is contained in:
Vladimir Serbinenko 2013-12-17 13:19:58 +01:00
parent 71669c3b76
commit d16ff5897f
2 changed files with 13 additions and 5 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2013-12-17 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/lib/x86_64/xen/relocator.S: Fix hypercall ABI violation.
GRUB relied on %rdi being preserved across hypercall which isn't true.
2013-12-17 Vladimir Serbinenko <phcoder@gmail.com>
Implement XEN VFB support.

12
grub-core/lib/x86_64/xen/relocator.S
View file

@ -30,6 +30,7 @@ VARIABLE(grub_relocator_xen_remapper_virt)
.quad 0
movq %rax, %rdi
movq %rax, %rbx
/* mov imm64, %rax */
.byte 0x48
@ -43,9 +44,9 @@ VARIABLE(grub_relocator_xen_remapper_map)
movq $__HYPERVISOR_update_va_mapping, %rax
syscall
addq $(LOCAL(cont) - LOCAL(base)), %rdi
addq $(LOCAL(cont) - LOCAL(base)), %rbx
jmp *%rdi
jmp *%rbx
LOCAL(cont):
@ -61,7 +62,7 @@ VARIABLE(grub_relocator_xen_paging_size)
VARIABLE(grub_relocator_xen_paging_start)
.quad 0
movq %rax, %rdi
movq %rax, %r12
/* mov imm64, %rax */
.byte 0x48
@ -70,7 +71,8 @@ VARIABLE(grub_relocator_xen_mfn_list)
.quad 0
movq %rax, %rsi
1:
1:
movq %r12, %rdi
movq %rsi, %rbx
movq 0(%rsi), %rsi
shlq $12, %rsi
@ -82,7 +84,7 @@ VARIABLE(grub_relocator_xen_mfn_list)
movq %r9, %rcx
addq $8, %rbx
addq $4096, %rdi
addq $4096, %r12
movq %rbx, %rsi
loop 1b