sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

MdePkg/BaseLib: Add one wrapper on RdRand access for parameter check.

Browse Source 
Add one wrapper implementation over assembly RdRand access to check
possible NULL parameter, for better alignment with comment description.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Qin Long
2016-11-04 15:31:28 +08:00
parent b3775af277
commit 9ec9a7a597
9 changed files with 188 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
MdePkg/Library/BaseLib/X64/RdRand.S
View File

@@ -1,5 +1,5 @@
#------------------------------------------------------------------------------ ;
# Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
# Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
@@ -24,10 +24,10 @@
// Generates a 16 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI AsmRdRand16 (UINT16 *Rand);
// BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmRdRand16)
ASM_PFX(AsmRdRand16):
ASM_GLOBAL ASM_PFX(InternalX86RdRand16)
ASM_PFX(InternalX86RdRand16):
.byte 0x0f, 0xc7, 0xf0 // rdrand r16: "0f c7 /6 ModRM:r/m(w)"
jc rn16_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0
@@ -41,10 +41,10 @@ rn16_ok:
// Generates a 32 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI AsmRdRand32 (UINT32 *Rand);
// BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmRdRand32)
ASM_PFX(AsmRdRand32):
ASM_GLOBAL ASM_PFX(InternalX86RdRand32)
ASM_PFX(InternalX86RdRand32):
.byte 0x0f, 0xc7, 0xf0 // rdrand r32: "0f c7 /6 ModRM:r/m(w)"
jc rn32_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0
@@ -58,10 +58,10 @@ rn32_ok:
// Generates a 64 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI AsmRdRand64 (UINT64 *Rand);
// BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmRdRand64)
ASM_PFX(AsmRdRand64):
ASM_GLOBAL ASM_PFX(InternalX86RdRand64)
ASM_PFX(InternalX86RdRand64):
.byte 0x48, 0x0f, 0xc7, 0xf0 // rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
jc rn64_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0