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Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
=A7=B0=A7=E4: Leif Lindholm <quic_llindhol@quicinc.com>
=A7=B0=A7=E4=A7=E1=A7=E2=A7=D1=A7=D3=A7=DD=A7=D6=A7=DF=A7=E0: =A7=D3= =A7=E4=A7=E0=A7=E2=A7=DF=A7=DA=A7=DC, =A7=E3=A7=D6=A7=DF=A7=E4=A7=F1=A7=D2= =A7=E2=A7=F1 26, 2023 12:16 PM
=A7=AC=A7=E0=A7=DE=A7=E5: devel@edk2.groups.io <devel@edk2.groups= .io>
=A7=AC=A7=E0=A7=E1=A7=DA=A7=F1: Philippe Mathieu-Daud=A8=A6 <phil= md@linaro.org>; Warkentin, Andrei <andrei.warkentin@intel.com>; Ar= d Biesheuvel <ardb+tianocore@kernel.org>; Sami Mujawar <sami.mujaw= ar@arm.com>
=A7=B4=A7=D6=A7=DE=A7=D1: [PATCH v2 4/5] MdePkg/BaseLib: correct reg= ister sizes in AArch64 SetJump/LongJump
 
Both in SetJump and in InternalLongJump, 32-bit w = register views were
used for the UINTN return value. In SetJump, this did not cause errors;
it was only counterintuitive. But in InternalLongJump, it meant the top
32 bits of Value were stripped off.

Change all of these to use the 64-bit x register views.

Signed-off-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reanimated-by: Andrei Warkentin <andrei.warkentin@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
---
 MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S   | 8 ++++= ----
 MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.asm | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S b/MdePkg/Libr= ary/BaseLib/AArch64/SetJumpLongJump.S
index de79ad3a0a3e..3e58119b25d2 100644
--- a/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S
+++ b/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.S
@@ -61,7 +61,7 @@ ASM_PFX(SetJump):
         FPR_LAYOUT
 #undef REG_PAIR
 #undef REG_ONE
-        mov     w0,= #0
+        mov     x0,= #0
         ret
 
 #/**
@@ -91,9 +91,9 @@ ASM_PFX(InternalLongJump):
 #undef REG_PAIR
 #undef REG_ONE
         mov    = ; sp, x16
-        cmp     w1,= #0
-        mov     w0,= #1
-        csel    w0, w1, = w0, ne
+        cmp     x1,= #0
+        mov     x0,= #1
+        csel    x0, x1, = x0, ne
         ret
 
 ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.asm b/MdePkg/Li= brary/BaseLib/AArch64/SetJumpLongJump.asm
index c2774eece311..6ec8f35f2c9f 100644
--- a/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.asm
+++ b/MdePkg/Library/BaseLib/AArch64/SetJumpLongJump.asm
@@ -59,7 +59,7 @@ SetJump
         FPR_LAYOUT
 #undef REG_PAIR
 #undef REG_ONE
-        mov     w0,= #0
+        mov     x0,= #0
         ret
 
 ;/**
@@ -88,10 +88,10 @@ InternalLongJump
 #undef REG_PAIR
 #undef REG_ONE
         mov    = ; sp, x16
-        cmp     w1,= #0
-        mov     w0,= #1
+        cmp     x1,= #0
+        mov     x0,= #1
         beq    = ; exit
-        mov     w0,= w1
+        mov     x0,= x1
 exit
         // use br not ret, as ret = is guaranteed to mispredict
         br    =   x30
--
2.30.2

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