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Add missing comments in rs6000-tdep.c, ppc64-tdep.c and ppc-linux-tdep.c.

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gdb/ChangeLog:

	* ppc-linux-tdep.c (ppc_skip_trampoline_code,
	ppc_canonicalize_syscall, ppc_linux_syscall_record,
	ppc_linux_record_signal, ppc_init_linux_record_tdep): Add comments.
	* ppc64-tdep.c (ppc64_skip_trampoline_code): Likewise.
	* rs6000-tdep.c (rs6000_epilogue_frame_cache,
	rs6000_epilogue_frame_this_id, rs6000_epilogue_frame_prev_register,
	rs6000_epilogue_frame_sniffer, ppc_record_vsr, ppc_process_record_op4,
	ppc_process_record_op19, ppc_process_record_op31,
	ppc_process_record_op59, ppc_process_record_op60,
	ppc_process_record_op63): Likewise.
This commit is contained in:
Wei-cheng Wang
2015-01-19 23:34:07 +08:00
parent 6c1965f995
commit ddeca1dffb
4 changed files with 70 additions and 13 deletions
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26
gdb/ppc-linux-tdep.c
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@@ -305,7 +305,12 @@ powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc)
return 0;
}
/* Follow PLT stub to actual routine. */
/* Follow PLT stub to actual routine.
When the execution direction is EXEC_REVERSE, scan backward to
check whether we are in the middle of a PLT stub. Currently,
we only look-behind at most 4 instructions (the max length of PLT
stub sequence. */
static CORE_ADDR
ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
@@ -791,11 +796,16 @@ ppc_linux_get_syscall_number (struct gdbarch *gdbarch,
static struct linux_record_tdep ppc_linux_record_tdep;
static struct linux_record_tdep ppc64_linux_record_tdep;
/* ppc_canonicalize_syscall maps from the native PowerPC Linux set of
syscall ids into a canonical set of syscall ids used by process
record. (See arch/powerpc/include/uapi/asm/unistd.h in kernel tree.)
Return -1 if this system call is not supported by process record.
Otherwise, return the syscall number for preocess reocrd of given
SYSCALL. */
static enum gdb_syscall
ppc_canonicalize_syscall (int syscall)
{
/* See arch/powerpc/include/uapi/asm/unistd.h */
if (syscall <= 165)
return syscall;
else if (syscall >= 167 && syscall <= 190) /* Skip query_module 166 */
@@ -821,6 +831,9 @@ ppc_canonicalize_syscall (int syscall)
return -1;
}
/* Record registers which might be clobbered during system call.
Return 0 if successful. */
static int
ppc_linux_syscall_record (struct regcache *regcache)
{
@@ -901,6 +914,9 @@ ppc_linux_syscall_record (struct regcache *regcache)
return 0;
}
/* Record registers which might be clobbered during signal handling.
Return 0 if successful. */
static int
ppc_linux_record_signal (struct gdbarch *gdbarch, struct regcache *regcache,
enum gdb_signal signal)
@@ -1417,7 +1433,9 @@ static const struct frame_unwind ppu2spu_unwind = {
ppu2spu_prev_arch,
};
/* Initialize linux_record_tdep if not initialized yet. */
/* Initialize linux_record_tdep if not initialized yet.
WORDSIZE is 4 or 8 for 32- or 64-bit PowerPC Linux respectively.
Sizes of data structures are initialized accordingly. */
static void
ppc_init_linux_record_tdep (struct linux_record_tdep *record_tdep,