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| author | Tom Rini <trini@konsulko.com> | 2022-12-19 09:29:55 -0500 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2022-12-21 13:09:01 -0500 |
| commit | 14f43797d0a696248c09d298e2f2809dded345ba (patch) | |
| tree | 23fc5bc462689f07f389cc0b8e7f7bedd35253ff /arch/riscv/lib/interrupts.c | |
| parent | 9c955393f7a27ded250fef7688e0065b44a3343f (diff) | |
| parent | 2243922edca9f56a9d5519b9d6e36f5d7a18434d (diff) | |
Merge tag 'v2023.01-rc4' into next
Prepare v2023.01-rc4
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/riscv/lib/interrupts.c')
| -rw-r--r-- | arch/riscv/lib/interrupts.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/riscv/lib/interrupts.c b/arch/riscv/lib/interrupts.c index 100be2e9662..e966afa7e3e 100644 --- a/arch/riscv/lib/interrupts.c +++ b/arch/riscv/lib/interrupts.c @@ -9,6 +9,7 @@ * Copyright (C) 2019 Sean Anderson <seanga2@gmail.com> */ +#include <linux/compat.h> #include <common.h> #include <efi_loader.h> #include <hang.h> @@ -17,6 +18,7 @@ #include <asm/ptrace.h> #include <asm/system.h> #include <asm/encoding.h> +#include <semihosting.h> DECLARE_GLOBAL_DATA_PTR; @@ -149,6 +151,29 @@ ulong handle_trap(ulong cause, ulong epc, ulong tval, struct pt_regs *regs) /* An UEFI application may have changed gd. Restore U-Boot's gd. */ efi_restore_gd(); + if (cause == CAUSE_BREAKPOINT && + CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK)) { + ulong pre_addr = epc - 4, post_addr = epc + 4; + + /* Check for prior and post addresses to be in same page. */ + if ((pre_addr & ~(PAGE_SIZE - 1)) == + (post_addr & ~(PAGE_SIZE - 1))) { + u32 pre = *(u32 *)pre_addr; + u32 post = *(u32 *)post_addr; + + /* Check for semihosting, i.e.: + * slli zero,zero,0x1f + * ebreak + * srai zero,zero,0x7 + */ + if (pre == 0x01f01013 && post == 0x40705013) { + disable_semihosting(); + epc += 4; + return epc; + } + } + } + is_irq = (cause & MCAUSE_INT); irq = (cause & ~MCAUSE_INT); |