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Document RELOLIS from commit 1bf58cf.

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I hastily chose the name RELOLIS for this relocation type.  If we want
to rename it, we only need to edit these files:

 - h/out.h
 - mach/powerpc/as/mach5.c
 - util/amisc/ashow.c
 - util/led/ack.out.5
 - util/led/relocate.c
This commit is contained in:
George Koehler 2017-02-10 11:59:34 -05:00
parent 83c13597e1
commit 13beb5e336
1 changed files with 18 additions and 4 deletions
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22
util/led/ack.out.5
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@ -161,12 +161,13 @@ struct outrelo {
/*
* relocation type bits
*/
#define RELSZ 0x0fff /* relocation length */
#define RELSZ 0x0fff /* relocation length */
#define RELO1 0x01 /* 1 byte */
#define RELO2 0x02 /* 2 bytes */
#define RELO4 0x03 /* 4 bytes */
#define RELOPPC 0x04 /* 26-bit PowerPC address */
#define RELOVC4 0x06 /* VideoCore IV address in 32-bit insruction */
#define RELOLIS 0x05 /* PowerPC lis */
#define RELOVC4 0x06 /* VideoCore IV address in 32-bit insruction */
#define RELPC 0x2000 /* pc relative */
#define RELBR 0x4000 /* High order byte lowest address. */
#define RELWR 0x8000 /* High order word lowest address. */
@ -225,10 +226,23 @@ is an absolute number, and the datum is relocated pc relative.
The relocatable datum must then be relocated with respect to the
base address of its section.
.PP
For RELOPPC and RELOVC4, the relocatable datum is a PowerPC or
VideoCore IV instruction.
The relocation depends on the instruction, and uses an offset encoded
in the instruction.
.PP
RELOLIS assembles a PowerPC \fBlis\fR instruction.
The relocatable datum is a 4-byte integer.
The high bit is set for ha16 or clear for hi16.
The next 5 bits are the register \fIRT\fR.
The low 26 bits are a signed offset.
The relocation replaces the datum with the PowerPC instruction
\(oq\fBlis\fR\ \fIRT\fR,\ ha16[\fIsymbol\fR\ +\ \fIoffset\fR]\(cq.
.PP
.B The symbol table.
.br
This table contains definitions of symbols. It is referred to by
outrelo-structures, and can be used by debuggers.
This table contains definitions of symbols.
It is referred to by outrelo-structures, and can be used by debuggers.
Entries in this table have the following structure:
.PP
.nf