From: Shiva Chen <shiva0217@gmail.com>
To: gcc@gcc.gnu.org
Subject: Aarch64 implementation for dwarf exception handling
Date: Thu, 13 Feb 2014 02:15:00 -0000 [thread overview]
Message-ID: <CAH=PD7byDjYwq3KjpR=THt-HO6a73Zy9abq8_Zttg8kqjy-VMw@mail.gmail.com> (raw)
Hi,
I have a question about the implementation of
aarch64_final_eh_return_addr
which is used to point out the return address of the frame
According the source code
If FP is not needed
return gen_frame_mem (DImode,
plus_constant (Pmode,
stack_pointer_rtx,
fp_offset
+ cfun->machine->frame.saved_regs_size
- 2 * UNITS_PER_WORD));
According the frame layout
+-------------------------------+ <-- arg_pointer_rtx
|
| callee-allocated save area
| for register varargs
|
+-------------------------------+
|
| local variables
|
+-------------------------------+ <-- frame_pointer_rtx
|
| callee-saved registers
|
+-------------------------------+
| LR'
+-------------------------------+
| FP'
P+-------------------------------+ <-- hard_frame_pointer_rtx
| dynamic allocation
+-------------------------------+
|
| outgoing stack arguments
|
+-------------------------------+ <-- stack_pointer_rtx
Shouldn't the return value be
return gen_frame_mem (DImode,
plus_constant (Pmode,
stack_pointer_rtx,
fp_offset
+ 2* UNITS_PER_WORD));
Or I just mis-understanding something ?
Hope someone could give me a tip.
It would be very helpful.
Thanks
Shiva Chen
next reply other threads:[~2014-02-13 2:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-13 2:15 Shiva Chen [this message]
2014-02-13 11:41 ` Yufeng Zhang 张玉峰
2014-02-13 14:32 ` Renlin Li
2014-02-13 15:37 ` Shiva Chen
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