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lib: sbi: Introduce the SBI debug triggers extension support

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RISC-V Debug specification includes Sdtrig ISA extension
which describes Trigger Module. Triggers can cause
a breakpoint exception or trace action without execution
of a special instruction. They can be used to implement
hardware breakpoints and watchpoints for native debugging.

The SBI Debut Trigger extension (Draft v6) can be found at:
https://lists.riscv.org/g/tech-debug/topic/99825362#1302

This patch is an initial implementation of SBI Debug
Trigger Extension (Draft v6) in OpenSBI.

The following features are supported:
 * mcontrol, mcontrol6 triggers
 * Breakpoint and trace actions

NOTE: Chained triggers are not supported

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan
2024-01-09 22:30:17 +05:30
committed by Anup Patel
parent 40dac6bcfe
commit 97f234f15c
4 changed files with 863 additions and 0 deletions
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9
lib/sbi/sbi_init.c
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@@ -23,6 +23,7 @@
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_pmu.h>
#include <sbi/sbi_dbtr.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_string.h>
#include <sbi/sbi_timer.h>
@@ -322,6 +323,10 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
sbi_hart_hang();
}
rc = sbi_dbtr_init(scratch, true);
if (rc)
sbi_hart_hang();
sbi_boot_print_banner(scratch);
rc = sbi_irqchip_init(scratch, true);
@@ -439,6 +444,10 @@ static void __noreturn init_warm_startup(struct sbi_scratch *scratch,
if (rc)
sbi_hart_hang();
rc = sbi_dbtr_init(scratch, false);
if (rc)
sbi_hart_hang();
rc = sbi_irqchip_init(scratch, false);
if (rc)
sbi_hart_hang();