diff options
Diffstat (limited to '052kernel-string-equal.subx')
| -rw-r--r-- | 052kernel-string-equal.subx | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/052kernel-string-equal.subx b/052kernel-string-equal.subx index dca4d399..9fd22d8d 100644 --- a/052kernel-string-equal.subx +++ b/052kernel-string-equal.subx @@ -1,11 +1,11 @@ # Checking null-terminated ascii strings. # # By default we create strings as arrays of bytes, and all arrays have a 4-byte -# length prefix. +# size prefix. # # However, we sometimes need to deal with null-prefixed strings when interacting # with the Linux kernel. This layer implements a function for comparing a -# null-terminated 'kernel string' with a length-prefixed 'SubX string'. +# null-terminated 'kernel string' with a size-prefixed 'SubX string'. # # To run (from the subx directory): # $ ./bootstrap translate 05[0-2]*.subx -o /tmp/tmp52 @@ -28,11 +28,11 @@ Entry: # run all tests b8/copy-to-eax 1/imm32/exit cd/syscall 0x80/imm8 -# compare a null-terminated ascii string with a more idiomatic length-prefixed byte array +# compare a null-terminated ascii string with a more idiomatic size-prefixed byte array # reason for the name: the only place we should have null-terminated ascii strings is from commandline args kernel-string-equal?: # s: (addr kernel-string), benchmark: (addr array byte) -> eax: boolean # pseudocode: - # n = benchmark->length + # n = benchmark->size # s1 = s # s2 = benchmark->data # i = 0 @@ -63,7 +63,7 @@ kernel-string-equal?: # s: (addr kernel-string), benchmark: (addr array byte) - 57/push-edi # var s1/edi: (addr byte) = s 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi - # var n/edx: int = benchmark->length + # var n/edx: int = benchmark->size 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0xc/disp8 . # copy *(ebp+12) to edx 8b/copy 0/mod/indirect 2/rm32/edx . . . 2/r32/edx . . # copy *edx to edx # var s2/esi: (addr byte) = benchmark->data |