This is the mail archive of the
ecos-bugs@sourceware.org
mailing list for the eCos project.
[Bug 1001111] New: Access to saved registers from Cortex-M ISR
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: ecos-bugs at ecos dot sourceware dot org
- Date: Fri, 7 Jan 2011 11:28:51 +0000
- Subject: [Bug 1001111] New: Access to saved registers from Cortex-M ISR
- Auto-submitted: auto-generated
Please do not reply to this email. Use the web interface provided at:
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001111
Summary: Access to saved registers from Cortex-M ISR
Product: eCos
Version: CVS
Platform: All
OS/Version: Cortex-M
Status: NEW
Severity: enhancement
Priority: normal
Component: HAL
AssignedTo: unassigned@bugs.ecos.sourceware.org
ReportedBy: john@dallaway.org.uk
CC: ecos-bugs@ecos.sourceware.org
Class: Advice Request
Created an attachment (id=1072)
--> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1072)
cortexm-intr-state-110107.patch
There is currently no access to the saved interrupt state from an ISR on
Cortex-M. This is required for implementing profiling support and is commonly
provided by passing a HAL_SavedRegisters* parameter into the ISR (eg ARM,
PowerPC).
On Cortex-M, interrupts are delivered via the C function
hal_deliver_interrupt() which is called from the default interrupt VSR. The
attached patch modifies the VSR to pass the interrupt state to
hal_deliver_interrupt() unconditionally. hal_deliver_interrupt() then passes
this parameter on to the ISR.
API impact is confined to code which calls hal_deliver_interrupt() directly -
currently a single instance in an STM32 springboard ISR only.
The patch adds two machine code instructions to an unoptimised build of
hal_deliver_interrupt(). The patch adds three machine code instructions to the
default interrupt VSR in the case where GDB break support is not enabled. These
three instructions could be made conditional on CYGPKG_PROFILE_GPROF, but
access to the saved interrupt state is unconditional on other architectures.
Comments?
--
Configure bugmail: http://bugs.ecos.sourceware.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.