diff options
| author | Lee Leahy <leroy.p.leahy@intel.com> | 2016-06-08 13:40:08 -0700 |
|---|---|---|
| committer | Leroy P Leahy <leroy.p.leahy@intel.com> | 2016-06-11 19:16:21 +0200 |
| commit | d131ea30785d0d862e169135a9d4c24afaeaa8c0 (patch) | |
| tree | 6258990df01907fde503e6d5b07dd98f8614504b /src/arch | |
| parent | fdc8c8b5fa88494ee5f62572830de10d4187dcce (diff) | |
arch/x86: Add debug spinloops in assembly_entry.S
Use Kconfig values to enable debug spinloops in assembly_entry.S. This
makes it easy to debug the assembly code.
TEST=Build and run on Galileo Gen2
Change-Id: Ic56bf2260b8e3181403623961874c9289f3ca945
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15135
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/Kconfig | 14 | ||||
| -rw-r--r-- | src/arch/x86/assembly_entry.S | 11 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 8609e20136..1fea99ac3b 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -179,3 +179,17 @@ config VERSTAGE_ADDR # from a program loaded in ram and subsequently loading ramstage. config POSTCAR_STAGE def_bool n + +config VERSTAGE_DEBUG_SPINLOOP + bool + default n + help + Add a spin (JMP .) in assembly_entry.S during early verstage to wait + for a JTAG debugger to break into the execution sequence. + +config ROMSTAGE_DEBUG_SPINLOOP + bool + default n + help + Add a spin (JMP .) in assembly_entry.S during early romstage to wait + for a JTAG debugger to break into the execution sequence. diff --git a/src/arch/x86/assembly_entry.S b/src/arch/x86/assembly_entry.S index 86dbba4668..d1f5d61ce7 100644 --- a/src/arch/x86/assembly_entry.S +++ b/src/arch/x86/assembly_entry.S @@ -52,6 +52,17 @@ _start: sub %edi, %ecx rep stosl +#if ((ENV_VERSTAGE && IS_ENABLED(CONFIG_VERSTAGE_DEBUG_SPINLOOP)) \ + || (ENV_ROMSTAGE && IS_ENABLED(CONFIG_ROMSTAGE_DEBUG_SPINLOOP))) + + /* Wait for a JTAG debugger to break in and set EBX non-zero */ + xor %ebx, %ebx + +debug_spinloop: + cmp $0, %ebx + jz debug_spinloop +#endif + jmp car_stage_entry /* This is here for linking purposes. */ |