Fork us on GitHub Follow us on Facebook Follow us on Twitter

Changeset e06ef614 in mainline for kernel/arch/amd64/src/asm.S


Ignore:
Timestamp:
2010-11-02T20:10:30Z (11 years ago)
Author:
Jakub Jermar <jakub@…>
Branches:
lfn, master
Children:
49d819b4, efedee7
Parents:
28f4adb (diff), e80329d6 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.
Message:

Merge from lp:~jakub/helenos/upa.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • kernel/arch/amd64/src/asm.S

    r28f4adb re06ef614  
    9595memcpy_from_uspace_failover_address:
    9696memcpy_to_uspace_failover_address:
    97         xorq %rax, %rax         /* return 0, failure */
     97        xorl %eax, %eax         /* return 0, failure */
    9898        ret
    9999
     
    143143
    144144set_efer_flag:
    145         movq $0xc0000080, %rcx
     145        movl $0xc0000080, %ecx
    146146        rdmsr
    147147        btsl %edi, %eax
     
    150150
    151151read_efer_flag:
    152         movq $0xc0000080, %rcx
     152        movl $0xc0000080, %ecx
    153153        rdmsr
    154154        ret
     
    243243         * Stop stack traces here if we came from userspace.
    244244         */
    245         xorq %rdx, %rdx
     245        xorl %edx, %edx
    246246        cmpq $(GDT_SELECTOR(KTEXT_DES)), ISTATE_OFFSET_CS(%rsp)
    247247        cmovnzq %rdx, %rbp
     
    386386        movq ISTATE_OFFSET_RSP(%rsp), %rsp
    387387
     388        /*
     389         * Clear the rest of the scratch registers to prevent information leak.
     390         * The 32-bit XOR on the low GPRs actually clears the entire 64-bit
     391         * register and the instruction is shorter.
     392         */
     393        xorl %edx, %edx
     394        xorl %esi, %esi
     395        xorl %edi, %edi
     396        xorq %r8, %r8
     397        xorq %r9, %r9
     398        xorq %r10, %r10
     399
    388400        sysretq
    389401
     
    413425        movq %rdi, %rsi
    414426        movq $(PA2KA(0xb8000)), %rdi  /* base of EGA text mode memory */
    415         xorq %rax, %rax
     427        xorl %eax, %eax
    416428       
    417429        /* Read bits 8 - 15 of the cursor address */
     
    493505                movq $(PA2KA(0xb80a0)), %rsi
    494506                movq $(PA2KA(0xb8000)), %rdi
    495                 movq $480, %rcx
     507                movl $480, %ecx
    496508                rep movsq
    497509               
    498510                /* Clear the 24th row */
    499                 xorq %rax, %rax
    500                 movq $20, %rcx
     511                xorl %eax, %eax
     512                movl $20, %ecx
    501513                rep stosq
    502514               
Note: See TracChangeset for help on using the changeset viewer.