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| author | Aurelien Jarno <aurelien@aurel32.net> | 2017-05-17 00:48:18 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2017-05-30 21:00:56 +0200 |
| commit | 73479c5c87bf431c6344a80ab01456ed979447f1 (patch) | |
| tree | 86a121bfd648630a310de854354b3c437d0714a6 | |
| parent | 324189babbc0b70d9ce558deb63d33040d002b7a (diff) | |
| download | focaccia-qemu-73479c5c87bf431c6344a80ab01456ed979447f1.tar.gz focaccia-qemu-73479c5c87bf431c6344a80ab01456ed979447f1.zip | |
target/sh4: fix reset when using a kernel and an initrd
When a masked exception happens, the SH4 CPU generates a non-masked reset exception, which then jumps to the reset vector at address 0xA0000000. While this is emulated correctly in QEMU, this does not work when using a kernel and initrd as this address then contain an illegal instruction (and there is no guarantee the kernel and initrd haven't been overwritten). Therefore call qemu_system_reset_request to reload the kernel and initrd and load the program counter to the kernel entry point. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
| -rw-r--r-- | target/sh4/helper.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/target/sh4/helper.c b/target/sh4/helper.c index 4c024f9529..16fcd1bbf2 100644 --- a/target/sh4/helper.c +++ b/target/sh4/helper.c @@ -21,6 +21,7 @@ #include "cpu.h" #include "exec/exec-all.h" #include "exec/log.h" +#include "sysemu/sysemu.h" #if !defined(CONFIG_USER_ONLY) #include "hw/sh4/sh_intc.h" @@ -92,7 +93,14 @@ void superh_cpu_do_interrupt(CPUState *cs) if (env->sr & (1u << SR_BL)) { if (do_exp && cs->exception_index != 0x1e0) { - cs->exception_index = 0x000; /* masked exception -> reset */ + /* In theory a masked exception generates a reset exception, + which in turn jumps to the reset vector. However this only + works when using a bootloader. When using a kernel and an + initrd, they need to be reloaded and the program counter + should be loaded with the kernel entry point. + qemu_system_reset_request takes care of that. */ + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); + return; } if (do_irq && !env->in_sleep) { return; /* masked */ |