diff options
| author | Sandra Loosemore <sandra@codesourcery.com> | 2019-04-03 13:53:05 -0600 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-04-29 16:09:51 +0100 |
| commit | 413a99a92c13ec408dcf2adaa87918dc81e890c8 (patch) | |
| tree | 464dba82fd644eea860bd991c4c1dc9f15b1a15a /target/nios2/helper.c | |
| parent | ed960ba90549aca1735df128c6b454fe0a5dec2a (diff) | |
Add Nios II semihosting support.
This patch adds support for libgloss semihosting to Nios II bare-metal
emulation. The specification for the protocol can be found in the
libgloss sources.
Signed-off-by: Sandra Loosemore <sandra@codesourcery.com>
Signed-off-by: Julian Brown <julian@codesourcery.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1554321185-2825-3-git-send-email-sandra@codesourcery.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/nios2/helper.c')
| -rw-r--r-- | target/nios2/helper.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/target/nios2/helper.c b/target/nios2/helper.c index a633fa03ee..e01fc1ff3e 100644 --- a/target/nios2/helper.c +++ b/target/nios2/helper.c @@ -23,8 +23,10 @@ #include "cpu.h" #include "qemu/host-utils.h" #include "exec/exec-all.h" +#include "exec/cpu_ldst.h" #include "exec/log.h" #include "exec/helper-proto.h" +#include "exec/semihost.h" #if defined(CONFIG_USER_ONLY) @@ -169,6 +171,17 @@ void nios2_cpu_do_interrupt(CPUState *cs) break; case EXCP_BREAK: + qemu_log_mask(CPU_LOG_INT, "BREAK exception at pc=%x\n", + env->regs[R_PC]); + /* The semihosting instruction is "break 1". */ + if (semihosting_enabled() && + cpu_ldl_code(env, env->regs[R_PC]) == 0x003da07a) { + qemu_log_mask(CPU_LOG_INT, "Entering semihosting\n"); + env->regs[R_PC] += 4; + do_nios2_semihosting(env); + break; + } + if ((env->regs[CR_STATUS] & CR_STATUS_EH) == 0) { env->regs[CR_BSTATUS] = env->regs[CR_STATUS]; env->regs[R_BA] = env->regs[R_PC] + 4; |