HongWoo Lee wrote:
Hi all,
I was reading kernel level source and found this macro.
#define SET_REG_TO_LABEL(reg, label) \
lis reg,(label)@highest; \
ori reg,reg,(label)@higher; \
rldicr reg,reg,32,31; \
oris reg,reg,(label)@h; \
ori reg,reg,(label)@l;
But, I couldn't find any clue related with @highest, @higher, @h, @l.
If anybody know about this directives(?), please explain it.
Or just let me know the keyword, so I can search with those keyword.
PowerPC instructions are 32-bit long. So, there are only 16 bits
available within the instruction for constant values. Since address can
be up to 64 bits, we have to load it a piece at a time. The "@" within
the assembler instruct it to give a specially-processed form of a symbol
value:
@highest -- refers to bits 48-63 of a constant
@higher -- refers to bits 32-47 of a constant
@h -- refers to bits 16-31 of a constant
@l -- refers to bits 0-15 of a constant
Thanks in advance.
HongWoo.
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