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Make provision for gdb debugging in kernel (VMA != LMA) #122

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Make provision for gdb debugging in kernel (VMA != LMA) #122

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eec3dab
Provide for LMA != VMA in gdb debugging
Jan 21, 2018
f43394f
Provide a kernel config option to set the load memory address (for gd…
Jan 21, 2018
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10 changes: 10 additions & 0 deletions arch/riscv/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,16 @@ config PAGE_OFFSET
default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB

config LMA_OFFSET
prompt "Load Memory address offset"
hex
default 0x00000000
help
This selects the load memory address in the vmlinux kernel, which
is needed if you want to do JTAG debugging on the kernel in gdb,
with VM initially off. Default is 0 for compatibility but a more
realistic value would be 0x80000000 for Rocket as an example.

config STACKTRACE_SUPPORT
def_bool y

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4 changes: 2 additions & 2 deletions arch/riscv/kernel/vmlinux.lds.S
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Expand Up @@ -12,7 +12,7 @@
* GNU General Public License for more details.
*/

#define LOAD_OFFSET PAGE_OFFSET
#define LOAD_OFFSET (PAGE_OFFSET-CONFIG_LMA_OFFSET)
#include <asm/vmlinux.lds.h>
#include <asm/page.h>
#include <asm/cache.h>
Expand All @@ -26,7 +26,7 @@ jiffies = jiffies_64;
SECTIONS
{
/* Beginning of code and text segment */
. = LOAD_OFFSET;
. = PAGE_OFFSET;
_start = .;
__init_begin = .;
HEAD_TEXT_SECTION
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