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X-Received-From: 216.71.153.141 Subject: [Qemu-devel] [RFC v2 20/24] tcg: Add RISC-V cpu signal handler X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alistair23@gmail.com" , "richard.henderson@linaro.org" , Alistair Francis Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Alistair Francis Signed-off-by: Michael Clark --- accel/tcg/user-exec.c | 75 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index cd75829cf2..941295ea49 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -571,6 +571,81 @@ int cpu_signal_handler(int host_signum, void *pinfo, return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask); } +#elif defined(__riscv) + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + greg_t pc = uc->uc_mcontext.__gregs[REG_PC]; + uint32_t insn = *(uint32_t *)pc; + int is_write = 0; + + /* Detect store by reading the instruction at the program + counter. Note: we currently only generate 32-bit + instructions so we thus only detect 32-bit stores */ + switch (((insn >> 0) & 0b11)) { + case 3: + switch (((insn >> 2) & 0b11111)) { + case 8: + switch (((insn >> 12) & 0b111)) { + case 0: /* sb */ + case 1: /* sh */ + case 2: /* sw */ + case 3: /* sd */ + case 4: /* sq */ + is_write = 1; + break; + default: + break; + } + break; + case 9: + switch (((insn >> 12) & 0b111)) { + case 2: /* fsw */ + case 3: /* fsd */ + case 4: /* fsq */ + is_write = 1; + break; + default: + break; + } + break; + default: + break; + } + } + + /* Check for compressed instructions */ + switch (((insn >> 13) & 0b111)) { + case 7: + switch (insn & 0b11) { + case 0: /*c.sd */ + case 2: /* c.sdsp */ + is_write = 1; + break; + default: + break; + } + break; + case 6: + switch (insn & 0b11) { + case 0: /* c.sw */ + case 3: /* c.swsp */ + is_write = 1; + break; + default: + break; + } + break; + default: + break; + } + + return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask); +} + #else #error host CPU specific signal handler needed