[mirror_edk2.git] / ArmPkg / Drivers / CpuDxe / AArch64 / ExceptionSupport.S

//\r
// Copyright (c) 2011 - 2013 ARM LTD. All rights reserved.<BR>\r
//\r
// This program and the accompanying materials\r
// are licensed and made available under the terms and conditions of the BSD License\r
// which accompanies this distribution.  The full text of the license may be found at\r
// http://opensource.org/licenses/bsd-license.php\r
//\r
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
//\r
//------------------------------------------------------------------------------\r
\r
#include <Library/PcdLib.h>\r
#include <AsmMacroIoLibV8.h>\r
\r
/*\r
  This is the stack constructed by the exception handler (low address to high address).\r
  X0 to FAR makes up the EFI_SYSTEM_CONTEXT for AArch64.\r
\r
  UINT64  X0;     0x000\r
  UINT64  X1;     0x008\r
  UINT64  X2;     0x010\r
  UINT64  X3;     0x018\r
  UINT64  X4;     0x020\r
  UINT64  X5;     0x028\r
  UINT64  X6;     0x030\r
  UINT64  X7;     0x038\r
  UINT64  X8;     0x040\r
  UINT64  X9;     0x048\r
  UINT64  X10;    0x050\r
  UINT64  X11;    0x058\r
  UINT64  X12;    0x060\r
  UINT64  X13;    0x068\r
  UINT64  X14;    0x070\r
  UINT64  X15;    0x078\r
  UINT64  X16;    0x080\r
  UINT64  X17;    0x088\r
  UINT64  X18;    0x090\r
  UINT64  X19;    0x098\r
  UINT64  X20;    0x0a0\r
  UINT64  X21;    0x0a8\r
  UINT64  X22;    0x0b0\r
  UINT64  X23;    0x0b8\r
  UINT64  X24;    0x0c0\r
  UINT64  X25;    0x0c8\r
  UINT64  X26;    0x0d0\r
  UINT64  X27;    0x0d8\r
  UINT64  X28;    0x0e0\r
  UINT64  FP;     0x0e8   // x29 - Frame Pointer\r
  UINT64  LR;     0x0f0   // x30 - Link Register\r
  UINT64  SP;     0x0f8   // x31 - Stack Pointer\r
\r
  // FP/SIMD Registers. 128bit if used as Q-regs.\r
  UINT64  V0[2];  0x100\r
  UINT64  V1[2];  0x110\r
  UINT64  V2[2];  0x120\r
  UINT64  V3[2];  0x130\r
  UINT64  V4[2];  0x140\r
  UINT64  V5[2];  0x150\r
  UINT64  V6[2];  0x160\r
  UINT64  V7[2];  0x170\r
  UINT64  V8[2];  0x180\r
  UINT64  V9[2];  0x190\r
  UINT64  V10[2]; 0x1a0\r
  UINT64  V11[2]; 0x1b0\r
  UINT64  V12[2]; 0x1c0\r
  UINT64  V13[2]; 0x1d0\r
  UINT64  V14[2]; 0x1e0\r
  UINT64  V15[2]; 0x1f0\r
  UINT64  V16[2]; 0x200\r
  UINT64  V17[2]; 0x210\r
  UINT64  V18[2]; 0x220\r
  UINT64  V19[2]; 0x230\r
  UINT64  V20[2]; 0x240\r
  UINT64  V21[2]; 0x250\r
  UINT64  V22[2]; 0x260\r
  UINT64  V23[2]; 0x270\r
  UINT64  V24[2]; 0x280\r
  UINT64  V25[2]; 0x290\r
  UINT64  V26[2]; 0x2a0\r
  UINT64  V27[2]; 0x2b0\r
  UINT64  V28[2]; 0x2c0\r
  UINT64  V29[2]; 0x2d0\r
  UINT64  V30[2]; 0x2e0\r
  UINT64  V31[2]; 0x2f0\r
\r
  // System Context\r
  UINT64  ELR;    0x300   // Exception Link Register\r
  UINT64  SPSR;   0x308   // Saved Processor Status Register\r
  UINT64  FPSR;   0x310   // Floating Point Status Register\r
  UINT64  ESR;    0x318   // EL1 Fault Address Register\r
  UINT64  FAR;    0x320   // EL1 Exception syndrome register\r
  UINT64  Padding;0x328   // Required for stack alignment\r
*/\r
\r
ASM_GLOBAL ASM_PFX(ExceptionHandlersStart)\r
ASM_GLOBAL ASM_PFX(ExceptionHandlersEnd)\r
ASM_GLOBAL ASM_PFX(CommonExceptionEntry)\r
ASM_GLOBAL ASM_PFX(AsmCommonExceptionEntry)\r
ASM_GLOBAL ASM_PFX(CommonCExceptionHandler)\r
\r
.text\r
.align 11\r
\r
#define GP_CONTEXT_SIZE    (32 *  8)\r
#define FP_CONTEXT_SIZE    (32 * 16)\r
#define SYS_CONTEXT_SIZE   ( 6 *  8) // 5 SYS regs + Alignment requirement (ie: the stack must be aligned on 0x10)\r
\r
// Cannot str x31 directly\r
#define ALL_GP_REGS                                     \\r
        REG_PAIR (x0,  x1,  0x000, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x2,  x3,  0x010, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x4,  x5,  0x020, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x6,  x7,  0x030, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x8,  x9,  0x040, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x10, x11, 0x050, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x12, x13, 0x060, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x14, x15, 0x070, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x16, x17, 0x080, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x18, x19, 0x090, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x20, x21, 0x0a0, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x22, x23, 0x0b0, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x24, x25, 0x0c0, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x26, x27, 0x0d0, GP_CONTEXT_SIZE);    \\r
        REG_PAIR (x28, x29, 0x0e0, GP_CONTEXT_SIZE);    \\r
        REG_ONE  (x30,      0x0f0, GP_CONTEXT_SIZE);\r
\r
// In order to save the SP we need to put it somwhere else first.\r
// STR only works with XZR/WZR directly\r
#define SAVE_SP \\r
        add x1, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE; \\r
        REG_ONE (x1,        0x0f8, GP_CONTEXT_SIZE);\r
\r
#define ALL_FP_REGS                                     \\r
        REG_PAIR (q0,  q1,  0x000, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q2,  q3,  0x020, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q4,  q5,  0x040, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q6,  q7,  0x060, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q8,  q9,  0x080, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q10, q11, 0x0a0, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q12, q13, 0x0c0, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q14, q15, 0x0e0, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q16, q17, 0x100, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q18, q19, 0x120, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q20, q21, 0x140, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q22, q23, 0x160, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q24, q25, 0x180, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q26, q27, 0x1a0, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q28, q29, 0x1c0, FP_CONTEXT_SIZE);    \\r
        REG_PAIR (q30, q31, 0x1e0, FP_CONTEXT_SIZE);\r
\r
#define ALL_SYS_REGS                                    \\r
        REG_PAIR (x1,  x2,  0x000, SYS_CONTEXT_SIZE);   \\r
        REG_PAIR (x3,  x4,  0x010, SYS_CONTEXT_SIZE);   \\r
        REG_ONE  (x5,       0x020, SYS_CONTEXT_SIZE);\r
\r
//\r
// This code gets copied to the ARM vector table\r
// VectorTableStart - VectorTableEnd gets copied\r
//\r
ASM_PFX(ExceptionHandlersStart):\r
\r
//\r
// Current EL with SP0 : 0x0 - 0x180\r
//\r
.align 7\r
ASM_PFX(SynchronousExceptionSP0):\r
  b   ASM_PFX(SynchronousExceptionEntry)\r
\r
.align 7\r
ASM_PFX(IrqSP0):\r
  b   ASM_PFX(IrqEntry)\r
\r
.align 7\r
ASM_PFX(FiqSP0):\r
  b   ASM_PFX(FiqEntry)\r
\r
.align 7\r
ASM_PFX(SErrorSP0):\r
  b   ASM_PFX(SErrorEntry)\r
\r
//\r
// Current EL with SPx: 0x200 - 0x380\r
//\r
.align 7\r
ASM_PFX(SynchronousExceptionSPx):\r
  b   ASM_PFX(SynchronousExceptionEntry)\r
\r
.align 7\r
ASM_PFX(IrqSPx):\r
  b   ASM_PFX(IrqEntry)\r
\r
.align 7\r
ASM_PFX(FiqSPx):\r
  b   ASM_PFX(FiqEntry)\r
\r
.align 7\r
ASM_PFX(SErrorSPx):\r
  b   ASM_PFX(SErrorEntry)\r
\r
//\r
// Lower EL using AArch64 : 0x400 - 0x580\r
//\r
.align 7\r
ASM_PFX(SynchronousExceptionA64):\r
  b   ASM_PFX(SynchronousExceptionEntry)\r
\r
.align 7\r
ASM_PFX(IrqA64):\r
  b   ASM_PFX(IrqEntry)\r
\r
.align 7\r
ASM_PFX(FiqA64):\r
  b   ASM_PFX(FiqEntry)\r
\r
.align 7\r
ASM_PFX(SErrorA64):\r
  b   ASM_PFX(SErrorEntry)\r
\r
//\r
// Lower EL using AArch32 : 0x0 - 0x180\r
//\r
.align 7\r
ASM_PFX(SynchronousExceptionA32):\r
  b   ASM_PFX(SynchronousExceptionEntry)\r
\r
.align 7\r
ASM_PFX(IrqA32):\r
  b   ASM_PFX(IrqEntry)\r
\r
.align 7\r
ASM_PFX(FiqA32):\r
  b   ASM_PFX(FiqEntry)\r
\r
.align 7\r
ASM_PFX(SErrorA32):\r
  b   ASM_PFX(SErrorEntry)\r
\r
\r
#undef  REG_PAIR\r
#undef  REG_ONE\r
#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE)  stp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]\r
#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE)         str REG1, [sp, #(OFFSET-CONTEXT_SIZE)]\r
\r
ASM_PFX(SynchronousExceptionEntry):\r
  // Move the stackpointer so we can reach our structure with the str instruction.\r
  sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
\r
  // Save all the General regs before touching x0 and x1.\r
  // This does not save r31(SP) as it is special. We do that later.\r
  ALL_GP_REGS\r
\r
  // Record the tipe of exception that occured.\r
  mov       x0, #EXCEPT_AARCH64_SYNCHRONOUS_EXCEPTIONS\r
\r
  // Jump to our general handler to deal with all the common parts and process the exception.\r
  ldr       x1, ASM_PFX(CommonExceptionEntry)\r
  br        x1\r
\r
ASM_PFX(IrqEntry):\r
  sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
  ALL_GP_REGS\r
  mov       x0, #EXCEPT_AARCH64_IRQ\r
  ldr       x1, ASM_PFX(CommonExceptionEntry)\r
  br        x1\r
\r
ASM_PFX(FiqEntry):\r
  sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
  ALL_GP_REGS\r
  mov       x0, #EXCEPT_AARCH64_FIQ\r
  ldr       x1, ASM_PFX(CommonExceptionEntry)\r
  br        x1\r
\r
ASM_PFX(SErrorEntry):\r
  sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
  ALL_GP_REGS\r
  mov       x0, #EXCEPT_AARCH64_SERROR\r
  ldr       x1, ASM_PFX(CommonExceptionEntry)\r
  br        x1\r
\r
\r
//\r
// This gets patched by the C code that patches in the vector table\r
//\r
.align 3\r
ASM_PFX(CommonExceptionEntry):\r
  .dword       ASM_PFX(AsmCommonExceptionEntry)\r
\r
ASM_PFX(ExceptionHandlersEnd):\r
\r
\r
\r
//\r
// This code runs from CpuDxe driver loaded address. It is patched into\r
// CommonExceptionEntry.\r
//\r
ASM_PFX(AsmCommonExceptionEntry):\r
  /* NOTE:\r
     We have to break up the save code because the immidiate value to be used\r
     with the SP is to big to do it all in one step so we need to shuffle the SP\r
     along as we go. (we only have 9bits of immediate to work with) */\r
\r
  // Save the current Stack pointer before we start modifying it.\r
  SAVE_SP\r
\r
  // Preserve the stack pointer we came in with before we modify it\r
  EL1_OR_EL2(x1)\r
1:mrs      x1, elr_el1   // Exception Link Register\r
  mrs      x2, spsr_el1  // Saved Processor Status Register 32bit\r
  mrs      x3, fpsr      // Floating point Status Register  32bit\r
  mrs      x4, esr_el1   // EL1 Exception syndrome register 32bit\r
  mrs      x5, far_el1   // EL1 Fault Address Register\r
  b        3f\r
\r
2:mrs      x1, elr_el2   // Exception Link Register\r
  mrs      x2, spsr_el2  // Saved Processor Status Register 32bit\r
  mrs      x3, fpsr      // Floating point Status Register  32bit\r
  mrs      x4, esr_el2   // EL1 Exception syndrome register 32bit\r
  mrs      x5, far_el2   // EL1 Fault Address Register\r
\r
  // Adjust SP to save next set\r
3:add      sp, sp, FP_CONTEXT_SIZE\r
\r
  // Push FP regs to Stack.\r
  ALL_FP_REGS\r
\r
  // Adjust SP to save next set\r
  add      sp, sp, SYS_CONTEXT_SIZE\r
\r
  // Save the SYS regs\r
  ALL_SYS_REGS\r
\r
  // Point to top of struct after all regs saved\r
  sub      sp, sp, GP_CONTEXT_SIZE + FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
\r
  // x0 still holds the exception type.\r
  // Set x1 to point to the top of our struct on the Stack\r
  mov      x1, sp\r
\r
// CommonCExceptionHandler (\r
//   IN     EFI_EXCEPTION_TYPE           ExceptionType,   R0\r
//   IN OUT EFI_SYSTEM_CONTEXT           SystemContext    R1\r
//   )\r
\r
  // Call the handler as defined above\r
\r
  // For now we spin in the handler if we received an abort of some kind.\r
  // We do not try to recover.\r
  bl       ASM_PFX(CommonCExceptionHandler) // Call exception handler\r
\r
\r
// Defines for popping from stack\r
\r
#undef REG_PAIR\r
#undef REG_ONE\r
#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE)    ldp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]\r
\r
#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE)           ldr REG1, [sp, #(OFFSET-CONTEXT_SIZE)]\r
\r
\r
  // pop all regs and return from exception.\r
  add      sp, sp, GP_CONTEXT_SIZE\r
  ALL_GP_REGS\r
\r
  // Adjust SP to pop next set\r
  add      sp, sp, FP_CONTEXT_SIZE\r
  // Pop FP regs to Stack.\r
  ALL_FP_REGS\r
\r
  // Adjust SP to be where we started from when we came into the handler.\r
  // The handler can not change the SP.\r
  add      sp, sp, SYS_CONTEXT_SIZE\r
\r
  eret\r
\r
#undef REG_PAIR\r
#undef REG_ONE\r
Commit	Line	Data
25402f5d HL	1	//\r
	2	// Copyright (c) 2011 - 2013 ARM LTD. All rights reserved.<BR>\r
	3	//\r
	4	// This program and the accompanying materials\r
	5	// are licensed and made available under the terms and conditions of the BSD License\r
	6	// which accompanies this distribution. The full text of the license may be found at\r
	7	// http://opensource.org/licenses/bsd-license.php\r
	8	//\r
	9	// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	10	// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	11	//\r
	12	//------------------------------------------------------------------------------\r
	13	\r
	14	#include <Library/PcdLib.h>\r
	15	#include <AsmMacroIoLibV8.h>\r
	16	\r
	17	/*\r
	18	This is the stack constructed by the exception handler (low address to high address).\r
	19	X0 to FAR makes up the EFI_SYSTEM_CONTEXT for AArch64.\r
	20	\r
	21	UINT64 X0; 0x000\r
	22	UINT64 X1; 0x008\r
	23	UINT64 X2; 0x010\r
	24	UINT64 X3; 0x018\r
	25	UINT64 X4; 0x020\r
	26	UINT64 X5; 0x028\r
	27	UINT64 X6; 0x030\r
	28	UINT64 X7; 0x038\r
	29	UINT64 X8; 0x040\r
	30	UINT64 X9; 0x048\r
	31	UINT64 X10; 0x050\r
	32	UINT64 X11; 0x058\r
	33	UINT64 X12; 0x060\r
	34	UINT64 X13; 0x068\r
	35	UINT64 X14; 0x070\r
	36	UINT64 X15; 0x078\r
	37	UINT64 X16; 0x080\r
	38	UINT64 X17; 0x088\r
	39	UINT64 X18; 0x090\r
	40	UINT64 X19; 0x098\r
	41	UINT64 X20; 0x0a0\r
	42	UINT64 X21; 0x0a8\r
	43	UINT64 X22; 0x0b0\r
	44	UINT64 X23; 0x0b8\r
	45	UINT64 X24; 0x0c0\r
	46	UINT64 X25; 0x0c8\r
	47	UINT64 X26; 0x0d0\r
	48	UINT64 X27; 0x0d8\r
	49	UINT64 X28; 0x0e0\r
	50	UINT64 FP; 0x0e8 // x29 - Frame Pointer\r
	51	UINT64 LR; 0x0f0 // x30 - Link Register\r
	52	UINT64 SP; 0x0f8 // x31 - Stack Pointer\r
	53	\r
	54	// FP/SIMD Registers. 128bit if used as Q-regs.\r
	55	UINT64 V0[2]; 0x100\r
	56	UINT64 V1[2]; 0x110\r
	57	UINT64 V2[2]; 0x120\r
	58	UINT64 V3[2]; 0x130\r
	59	UINT64 V4[2]; 0x140\r
	60	UINT64 V5[2]; 0x150\r
	61	UINT64 V6[2]; 0x160\r
	62	UINT64 V7[2]; 0x170\r
	63	UINT64 V8[2]; 0x180\r
	64	UINT64 V9[2]; 0x190\r
65	UINT64 V10[2]; 0x1a0\r
66	UINT64 V11[2]; 0x1b0\r
67	UINT64 V12[2]; 0x1c0\r
68	UINT64 V13[2]; 0x1d0\r
69	UINT64 V14[2]; 0x1e0\r
70	UINT64 V15[2]; 0x1f0\r
71	UINT64 V16[2]; 0x200\r
72	UINT64 V17[2]; 0x210\r
73	UINT64 V18[2]; 0x220\r
74	UINT64 V19[2]; 0x230\r
75	UINT64 V20[2]; 0x240\r
76	UINT64 V21[2]; 0x250\r
77	UINT64 V22[2]; 0x260\r
78	UINT64 V23[2]; 0x270\r
79	UINT64 V24[2]; 0x280\r
80	UINT64 V25[2]; 0x290\r
81	UINT64 V26[2]; 0x2a0\r
82	UINT64 V27[2]; 0x2b0\r
83	UINT64 V28[2]; 0x2c0\r
84	UINT64 V29[2]; 0x2d0\r
85	UINT64 V30[2]; 0x2e0\r
86	UINT64 V31[2]; 0x2f0\r
87	\r
88	// System Context\r
89	UINT64 ELR; 0x300 // Exception Link Register\r
90	UINT64 SPSR; 0x308 // Saved Processor Status Register\r
91	UINT64 FPSR; 0x310 // Floating Point Status Register\r
92	UINT64 ESR; 0x318 // EL1 Fault Address Register\r
93	UINT64 FAR; 0x320 // EL1 Exception syndrome register\r
94	UINT64 Padding;0x328 // Required for stack alignment\r
95	*/\r
96	\r
97	ASM_GLOBAL ASM_PFX(ExceptionHandlersStart)\r
98	ASM_GLOBAL ASM_PFX(ExceptionHandlersEnd)\r
99	ASM_GLOBAL ASM_PFX(CommonExceptionEntry)\r
100	ASM_GLOBAL ASM_PFX(AsmCommonExceptionEntry)\r
101	ASM_GLOBAL ASM_PFX(CommonCExceptionHandler)\r
102	\r
103	.text\r
104	.align 11\r
105	\r
106	#define GP_CONTEXT_SIZE (32 * 8)\r
107	#define FP_CONTEXT_SIZE (32 * 16)\r
108	#define SYS_CONTEXT_SIZE ( 6 * 8) // 5 SYS regs + Alignment requirement (ie: the stack must be aligned on 0x10)\r
109	\r
110	// Cannot str x31 directly\r
111	#define ALL_GP_REGS \\r
112	REG_PAIR (x0, x1, 0x000, GP_CONTEXT_SIZE); \\r
113	REG_PAIR (x2, x3, 0x010, GP_CONTEXT_SIZE); \\r
114	REG_PAIR (x4, x5, 0x020, GP_CONTEXT_SIZE); \\r
115	REG_PAIR (x6, x7, 0x030, GP_CONTEXT_SIZE); \\r
116	REG_PAIR (x8, x9, 0x040, GP_CONTEXT_SIZE); \\r
117	REG_PAIR (x10, x11, 0x050, GP_CONTEXT_SIZE); \\r
118	REG_PAIR (x12, x13, 0x060, GP_CONTEXT_SIZE); \\r
119	REG_PAIR (x14, x15, 0x070, GP_CONTEXT_SIZE); \\r
120	REG_PAIR (x16, x17, 0x080, GP_CONTEXT_SIZE); \\r
121	REG_PAIR (x18, x19, 0x090, GP_CONTEXT_SIZE); \\r
122	REG_PAIR (x20, x21, 0x0a0, GP_CONTEXT_SIZE); \\r
123	REG_PAIR (x22, x23, 0x0b0, GP_CONTEXT_SIZE); \\r
124	REG_PAIR (x24, x25, 0x0c0, GP_CONTEXT_SIZE); \\r
125	REG_PAIR (x26, x27, 0x0d0, GP_CONTEXT_SIZE); \\r
126	REG_PAIR (x28, x29, 0x0e0, GP_CONTEXT_SIZE); \\r
127	REG_ONE (x30, 0x0f0, GP_CONTEXT_SIZE);\r
128	\r
129	// In order to save the SP we need to put it somwhere else first.\r
130	// STR only works with XZR/WZR directly\r
131	#define SAVE_SP \\r
132	add x1, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE; \\r
133	REG_ONE (x1, 0x0f8, GP_CONTEXT_SIZE);\r
134	\r
135	#define ALL_FP_REGS \\r
136	REG_PAIR (q0, q1, 0x000, FP_CONTEXT_SIZE); \\r
137	REG_PAIR (q2, q3, 0x020, FP_CONTEXT_SIZE); \\r
138	REG_PAIR (q4, q5, 0x040, FP_CONTEXT_SIZE); \\r
139	REG_PAIR (q6, q7, 0x060, FP_CONTEXT_SIZE); \\r
140	REG_PAIR (q8, q9, 0x080, FP_CONTEXT_SIZE); \\r
141	REG_PAIR (q10, q11, 0x0a0, FP_CONTEXT_SIZE); \\r
142	REG_PAIR (q12, q13, 0x0c0, FP_CONTEXT_SIZE); \\r
143	REG_PAIR (q14, q15, 0x0e0, FP_CONTEXT_SIZE); \\r
144	REG_PAIR (q16, q17, 0x100, FP_CONTEXT_SIZE); \\r
145	REG_PAIR (q18, q19, 0x120, FP_CONTEXT_SIZE); \\r
146	REG_PAIR (q20, q21, 0x140, FP_CONTEXT_SIZE); \\r
147	REG_PAIR (q22, q23, 0x160, FP_CONTEXT_SIZE); \\r
148	REG_PAIR (q24, q25, 0x180, FP_CONTEXT_SIZE); \\r
149	REG_PAIR (q26, q27, 0x1a0, FP_CONTEXT_SIZE); \\r
150	REG_PAIR (q28, q29, 0x1c0, FP_CONTEXT_SIZE); \\r
151	REG_PAIR (q30, q31, 0x1e0, FP_CONTEXT_SIZE);\r
152	\r
153	#define ALL_SYS_REGS \\r
154	REG_PAIR (x1, x2, 0x000, SYS_CONTEXT_SIZE); \\r
155	REG_PAIR (x3, x4, 0x010, SYS_CONTEXT_SIZE); \\r
156	REG_ONE (x5, 0x020, SYS_CONTEXT_SIZE);\r
157	\r
158	//\r
159	// This code gets copied to the ARM vector table\r
160	// VectorTableStart - VectorTableEnd gets copied\r
161	//\r
162	ASM_PFX(ExceptionHandlersStart):\r
163	\r
164	//\r
165	// Current EL with SP0 : 0x0 - 0x180\r
166	//\r
167	.align 7\r
168	ASM_PFX(SynchronousExceptionSP0):\r
169	b ASM_PFX(SynchronousExceptionEntry)\r
170	\r
171	.align 7\r
172	ASM_PFX(IrqSP0):\r
173	b ASM_PFX(IrqEntry)\r
174	\r
175	.align 7\r
176	ASM_PFX(FiqSP0):\r
177	b ASM_PFX(FiqEntry)\r
178	\r
179	.align 7\r
180	ASM_PFX(SErrorSP0):\r
181	b ASM_PFX(SErrorEntry)\r
182	\r
183	//\r
184	// Current EL with SPx: 0x200 - 0x380\r
185	//\r
186	.align 7\r
187	ASM_PFX(SynchronousExceptionSPx):\r
188	b ASM_PFX(SynchronousExceptionEntry)\r
189	\r
190	.align 7\r
191	ASM_PFX(IrqSPx):\r
192	b ASM_PFX(IrqEntry)\r
193	\r
194	.align 7\r
195	ASM_PFX(FiqSPx):\r
196	b ASM_PFX(FiqEntry)\r
197	\r
198	.align 7\r
199	ASM_PFX(SErrorSPx):\r
200	b ASM_PFX(SErrorEntry)\r
201	\r
202	//\r
203	// Lower EL using AArch64 : 0x400 - 0x580\r
204	//\r
205	.align 7\r
206	ASM_PFX(SynchronousExceptionA64):\r
207	b ASM_PFX(SynchronousExceptionEntry)\r
208	\r
209	.align 7\r
210	ASM_PFX(IrqA64):\r
211	b ASM_PFX(IrqEntry)\r
212	\r
213	.align 7\r
214	ASM_PFX(FiqA64):\r
215	b ASM_PFX(FiqEntry)\r
216	\r
217	.align 7\r
218	ASM_PFX(SErrorA64):\r
219	b ASM_PFX(SErrorEntry)\r
220	\r
221	//\r
222	// Lower EL using AArch32 : 0x0 - 0x180\r
223	//\r
224	.align 7\r
225	ASM_PFX(SynchronousExceptionA32):\r
226	b ASM_PFX(SynchronousExceptionEntry)\r
227	\r
228	.align 7\r
229	ASM_PFX(IrqA32):\r
230	b ASM_PFX(IrqEntry)\r
231	\r
232	.align 7\r
233	ASM_PFX(FiqA32):\r
234	b ASM_PFX(FiqEntry)\r
235	\r
236	.align 7\r
237	ASM_PFX(SErrorA32):\r
238	b ASM_PFX(SErrorEntry)\r
239	\r
240	\r
241	#undef REG_PAIR\r
242	#undef REG_ONE\r
243	#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE) stp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]\r
244	#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE) str REG1, [sp, #(OFFSET-CONTEXT_SIZE)]\r
245	\r
246	ASM_PFX(SynchronousExceptionEntry):\r
247	// Move the stackpointer so we can reach our structure with the str instruction.\r
248	sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
249	\r
250	// Save all the General regs before touching x0 and x1.\r
251	// This does not save r31(SP) as it is special. We do that later.\r
252	ALL_GP_REGS\r
253	\r
254	// Record the tipe of exception that occured.\r
255	mov x0, #EXCEPT_AARCH64_SYNCHRONOUS_EXCEPTIONS\r
256	\r
257	// Jump to our general handler to deal with all the common parts and process the exception.\r
258	ldr x1, ASM_PFX(CommonExceptionEntry)\r
259	br x1\r
260	\r
261	ASM_PFX(IrqEntry):\r
262	sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
263	ALL_GP_REGS\r
264	mov x0, #EXCEPT_AARCH64_IRQ\r
265	ldr x1, ASM_PFX(CommonExceptionEntry)\r
266	br x1\r
267	\r
268	ASM_PFX(FiqEntry):\r
269	sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
270	ALL_GP_REGS\r
271	mov x0, #EXCEPT_AARCH64_FIQ\r
272	ldr x1, ASM_PFX(CommonExceptionEntry)\r
273	br x1\r
274	\r
275	ASM_PFX(SErrorEntry):\r
276	sub sp, sp, FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
277	ALL_GP_REGS\r
278	mov x0, #EXCEPT_AARCH64_SERROR\r
279	ldr x1, ASM_PFX(CommonExceptionEntry)\r
280	br x1\r
281	\r
282	\r
283	//\r
284	// This gets patched by the C code that patches in the vector table\r
285	//\r
286	.align 3\r
287	ASM_PFX(CommonExceptionEntry):\r
288	.dword ASM_PFX(AsmCommonExceptionEntry)\r
289	\r
290	ASM_PFX(ExceptionHandlersEnd):\r
291	\r
292	\r
293	\r
294	//\r
295	// This code runs from CpuDxe driver loaded address. It is patched into\r
296	// CommonExceptionEntry.\r
297	//\r
298	ASM_PFX(AsmCommonExceptionEntry):\r
299	/* NOTE:\r
300	We have to break up the save code because the immidiate value to be used\r
301	with the SP is to big to do it all in one step so we need to shuffle the SP\r
302	along as we go. (we only have 9bits of immediate to work with) */\r
303	\r
304	// Save the current Stack pointer before we start modifying it.\r
305	SAVE_SP\r
306	\r
307	// Preserve the stack pointer we came in with before we modify it\r
308	EL1_OR_EL2(x1)\r
309	1:mrs x1, elr_el1 // Exception Link Register\r
310	mrs x2, spsr_el1 // Saved Processor Status Register 32bit\r
311	mrs x3, fpsr // Floating point Status Register 32bit\r
312	mrs x4, esr_el1 // EL1 Exception syndrome register 32bit\r
313	mrs x5, far_el1 // EL1 Fault Address Register\r
314	b 3f\r
315	\r
316	2:mrs x1, elr_el2 // Exception Link Register\r
317	mrs x2, spsr_el2 // Saved Processor Status Register 32bit\r
318	mrs x3, fpsr // Floating point Status Register 32bit\r
319	mrs x4, esr_el2 // EL1 Exception syndrome register 32bit\r
320	mrs x5, far_el2 // EL1 Fault Address Register\r
321	\r
322	// Adjust SP to save next set\r
323	3:add sp, sp, FP_CONTEXT_SIZE\r
324	\r
325	// Push FP regs to Stack.\r
326	ALL_FP_REGS\r
327	\r
328	// Adjust SP to save next set\r
329	add sp, sp, SYS_CONTEXT_SIZE\r
330	\r
331	// Save the SYS regs\r
332	ALL_SYS_REGS\r
333	\r
334	// Point to top of struct after all regs saved\r
335	sub sp, sp, GP_CONTEXT_SIZE + FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE\r
336	\r
337	// x0 still holds the exception type.\r
338	// Set x1 to point to the top of our struct on the Stack\r
339	mov x1, sp\r
340	\r
341	// CommonCExceptionHandler (\r
342	// IN EFI_EXCEPTION_TYPE ExceptionType, R0\r
343	// IN OUT EFI_SYSTEM_CONTEXT SystemContext R1\r
344	// )\r
345	\r
346	// Call the handler as defined above\r
347	\r
348	// For now we spin in the handler if we received an abort of some kind.\r
349	// We do not try to recover.\r
350	bl ASM_PFX(CommonCExceptionHandler) // Call exception handler\r
351	\r
352	\r
353	// Defines for popping from stack\r
354	\r
355	#undef REG_PAIR\r
356	#undef REG_ONE\r
357	#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE) ldp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]\r
358	\r
359	#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE) ldr REG1, [sp, #(OFFSET-CONTEXT_SIZE)]\r
360	\r
361	\r
362	// pop all regs and return from exception.\r
363	add sp, sp, GP_CONTEXT_SIZE\r
364	ALL_GP_REGS\r
365	\r
366	// Adjust SP to pop next set\r
367	add sp, sp, FP_CONTEXT_SIZE\r
368	// Pop FP regs to Stack.\r
369	ALL_FP_REGS\r
370	\r
371	// Adjust SP to be where we started from when we came into the handler.\r
372	// The handler can not change the SP.\r
373	add sp, sp, SYS_CONTEXT_SIZE\r
374	\r
375	eret\r
376	\r
377	#undef REG_PAIR\r
378	#undef REG_ONE\r