84 lines
2.7 KiB
Diff
84 lines
2.7 KiB
Diff
From a210b02b15d68bfe38651295f35edb1a21cef475 Mon Sep 17 00:00:00 2001
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From: Matt Fleming <matt.fleming@intel.com>
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Date: Fri, 27 Mar 2015 08:11:19 -0700
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Subject: [PATCH] efi: chainloader: implement an UEFI Exit service
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Upstream-Status: Inappropriate [embedded specific]
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Implement an UEFI Exit service for shim in grub.
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When exiting, grub will call the UEFI boot-time service Exit. The
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effect of this is that UEFI will jump to the entry point of the
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UEFI started image. If we execute an image using shim within grub,
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shim takes care of loading/parsing/relocating/executing the image.
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Under this scenario, we also need to take care of the Exit call. Thus,
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we need to reimplement the function to make sure we perform a jump
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to the instruction after which shim executed the image.
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Once we have taken care of the exit of the shim-executed image
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the system Exit call is restored.
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Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
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[lz: Adapt git shortlog.]
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Signed-off-by: Li Zhou <li.zhou@windriver.com>
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---
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grub-core/kern/x86_64/efi/callwrap.S | 23 +++++++++++++++++++++++
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include/grub/efi/api.h | 4 ++++
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2 files changed, 27 insertions(+)
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diff --git a/grub-core/kern/x86_64/efi/callwrap.S b/grub-core/kern/x86_64/efi/callwrap.S
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index 1337fd9..b849c2c 100644
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--- a/grub-core/kern/x86_64/efi/callwrap.S
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+++ b/grub-core/kern/x86_64/efi/callwrap.S
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@@ -48,6 +48,26 @@ FUNCTION(efi_wrap_1)
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addq $40, %rsp
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ret
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+FUNCTION(efi_call_foo)
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+ pushq %rbp
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+ pushq %r12
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+ pushq %r13
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+ pushq %r14
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+ pushq %r15
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+ movq %rsp, saved_sp(%rip)
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+ subq $48, %rsp
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+ mov %rsi, %rcx
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+ call *%rdi
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+
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+FUNCTION(efi_shim_exit)
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+ movq saved_sp(%rip), %rsp
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+ popq %r15
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+ popq %r14
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+ popq %r13
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+ popq %r12
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+ popq %rbp
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+ ret
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+
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FUNCTION(efi_wrap_2)
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subq $40, %rsp
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mov %rsi, %rcx
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@@ -127,3 +147,6 @@ FUNCTION(efi_wrap_10)
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call *%rdi
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addq $88, %rsp
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ret
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+
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+ .data
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+saved_sp: .quad 0
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diff --git a/include/grub/efi/api.h b/include/grub/efi/api.h
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index f1a5221..de3bbbd 100644
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--- a/include/grub/efi/api.h
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+++ b/include/grub/efi/api.h
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@@ -1776,6 +1776,10 @@ typedef struct grub_efi_rng_protocol grub_efi_rng_protocol_t;
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grub_uint64_t EXPORT_FUNC(efi_wrap_0) (void *func);
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grub_uint64_t EXPORT_FUNC(efi_wrap_1) (void *func, grub_uint64_t arg1);
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+grub_efi_status_t EXPORT_FUNC(efi_shim_exit) (grub_efi_handle_t handle, grub_efi_status_t exit_status,
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+ grub_efi_uintn_t exit_data_size, grub_efi_char16_t *exit_data) __attribute__((noreturn));
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+grub_uint64_t EXPORT_FUNC(efi_call_foo) (void *func, grub_uint64_t arg1,
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+ grub_uint64_t arg2);
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grub_uint64_t EXPORT_FUNC(efi_wrap_2) (void *func, grub_uint64_t arg1,
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grub_uint64_t arg2);
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grub_uint64_t EXPORT_FUNC(efi_wrap_3) (void *func, grub_uint64_t arg1,
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--
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2.17.1
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