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Linux/arch/arm64/kernel/efi-rt-wrapper.S

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Diff markup

Differences between /arch/arm64/kernel/efi-rt-wrapper.S (Version linux-6.12-rc7) and /arch/ppc/kernel/efi-rt-wrapper.S (Version linux-5.7.19)


  1 /* SPDX-License-Identifier: GPL-2.0-only */       
  2 /*                                                
  3  * Copyright (C) 2018 Linaro Ltd <ard.biesheuve    
  4  */                                               
  5                                                   
  6 #include <linux/linkage.h>                        
  7 #include <asm/assembler.h>                        
  8                                                   
  9 SYM_FUNC_START(__efi_rt_asm_wrapper)              
 10         stp     x29, x30, [sp, #-112]!            
 11         mov     x29, sp                           
 12                                                   
 13         /*                                        
 14          * Register x18 is designated as the '    
 15          * which means firmware running at the    
 16          * (such as UEFI) should never touch i    
 17          */                                       
 18         stp     x1, x18, [sp, #16]                
 19                                                   
 20         /*                                        
 21          * Preserve all callee saved registers    
 22          * value at the base of the EFI runtim    
 23          * synchronous exceptions occurring wh    
 24          * routines.                              
 25          */                                       
 26         stp     x19, x20, [sp, #32]               
 27         stp     x21, x22, [sp, #48]               
 28         stp     x23, x24, [sp, #64]               
 29         stp     x25, x26, [sp, #80]               
 30         stp     x27, x28, [sp, #96]               
 31                                                   
 32         ldr_l   x16, efi_rt_stack_top             
 33         mov     sp, x16                           
 34         stp     x18, x29, [sp, #-16]!             
 35                                                   
 36         /*                                        
 37          * We are lucky enough that no EFI run    
 38          * 5 arguments, so all are passed in r    
 39          * stack.                                 
 40          */                                       
 41         mov     x8, x0                            
 42         mov     x0, x2                            
 43         mov     x1, x3                            
 44         mov     x2, x4                            
 45         mov     x3, x5                            
 46         mov     x4, x6                            
 47         blr     x8                                
 48                                                   
 49         mov     x16, sp                           
 50         mov     sp, x29                           
 51         str     xzr, [x16, #8]                    
 52                                                   
 53         ldp     x1, x2, [sp, #16]                 
 54         cmp     x2, x18                           
 55         ldp     x29, x30, [sp], #112              
 56         b.ne    0f                                
 57         ret                                       
 58 0:                                                
 59         /*                                        
 60          * With CONFIG_SHADOW_CALL_STACK, the     
 61          * shadow stack pointer, which we need    
 62          * potentially instrumented code. This    
 63          * called with preemption disabled and    
 64          * for interrupts.                        
 65          */                                       
 66 #ifdef CONFIG_SHADOW_CALL_STACK                   
 67         ldr_l   x18, efi_rt_stack_top             
 68         ldr     x18, [x18, #-16]                  
 69 #endif                                            
 70                                                   
 71         b       efi_handle_corrupted_x18          
 72 SYM_FUNC_END(__efi_rt_asm_wrapper)                
 73                                                   
 74 SYM_CODE_START(__efi_rt_asm_recover)              
 75         mov     sp, x30                           
 76                                                   
 77         ldr_l   x16, efi_rt_stack_top             
 78         str     xzr, [x16, #-8]                   
 79                                                   
 80         ldp     x19, x20, [sp, #32]               
 81         ldp     x21, x22, [sp, #48]               
 82         ldp     x23, x24, [sp, #64]               
 83         ldp     x25, x26, [sp, #80]               
 84         ldp     x27, x28, [sp, #96]               
 85         ldp     x29, x30, [sp], #112              
 86         ret                                       
 87 SYM_CODE_END(__efi_rt_asm_recover)                
                                                      

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