OpenE2K/binutils-gdb
12
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

* mep-tdep.c (mep_analyze_prologue): Update comment for BRA

Browse Source 
instruction case.
This commit is contained in:
Kevin Buettner 2007-07-14 00:15:50 +00:00
parent c144990811
commit f219aedc69
2 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2007-07-13 Kevin Buettner <kevinb@redhat.com>
* mep-tdep.c (mep_analyze_prologue): Update comment for BRA
instruction case.
2007-07-12 Kevin Buettner <kevinb@redhat.com>
* mep-tdep.c (IS_BRA, BRA_DISP): New macros.

15
gdb/mep-tdep.c
View File

@ -1812,13 +1812,24 @@ mep_analyze_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc,
}
else if (IS_BRA (insn) && BRA_DISP (insn) > 0)
{
/* When a loop appears as the first statement as a function
/* When a loop appears as the first statement of a function
body, gcc 4.x will use a BRA instruction to branch to the
loop condition checking code. This BRA instruction is
marked as part of the prologue. We therefore set next_pc
to this branch target and also stop the prologue scan.
The instructions at and beyond the branch target should
no longer be associated with the prologue. */
no longer be associated with the prologue.
Note that we only consider forward branches here. We
presume that a forward branch is being used to skip over
a loop body.
A backwards branch is covered by the default case below.
If we were to encounter a backwards branch, that would
most likely mean that we've scanned through a loop body.
We definitely want to stop the prologue scan when this
happens and that is precisely what is done by the default
case below. */
next_pc = pc + BRA_DISP (insn);
after_last_frame_setup_insn = next_pc;
break;