#
bebfcf6d |
|
23-Jun-2016 |
Kofi Doku Atuah <kofi.dokuatuah@nicta.com.au> |
SELFOUR-499: X86, ARM: Add userspace invocations for hardware debugging This commit implements the body of SELFOUR-499. The API exposes the x86 DR0-7 and ARM coprocessor 14 features to userspace by virtualizing them as context- switched registers in the TCB. Implemented as TCB invocations. This feature is only built when CONFIG_HARDWARE_DEBUG_API is selected. * Add low-level support routines for setting, unsetting, getting, enabling and disabling breakpoints. * Add support for single-stepping as well. ^ Single-stepping is not supported on ARMv6 since the hardware doesn't have support. ^ ARM implements single-stepping as instruction breakpoints configured to fault on every instruction -- this is achieved through the "mismatch" mode, which is only supported from ARMv7 onwards. * Also support explicit software break requests, a la "BKPT" and "INT $3". * New invocations: * seL4_TCB_SetBreakpoint(). * seL4_TCB_GetBreakpoint(). * seL4_TCB_UnsetBreakpoint(). * seL4_TCB_ConfigureSingleStepping(). * New constants: ^ Event types: ^ seL4_InstructionBreakpoint. ^ seL4_DataBreakpoint. ^ seL4_SoftwareBreakRequest. ^ Access types: ^ seL4_BreakOnRead. ^ seL4_BreakOnWrite. ^ seL4_BreakOnReadWrite. ^ Exports: ^ seL4_NumHWBreakpoints. ^ seL4_NumExclusiveBreakpoints. ^ seL4_NumExclusiveWatchpoints. ^ seL4_NumDualFunctionMonitors. ^ seL4_FirstBreakpoint. ^ seL4_FirstWatchpoint. ^ seL4_FirstDualFunctionMonitor. See documentation in the seL4 API manual.
|