diff options
| author | Paul Mackerras <paulus@samba.org> | 2005-10-28 22:48:08 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-10-28 22:48:08 +1000 |
| commit | c032524f0ddea5fcc3a2cece0d4a61f37e5ca9cd (patch) | |
| tree | c4ece990e6083cfedc640a06f908bfe33fd344bd /arch/powerpc/lib/sstep.c | |
| parent | d73e0c99f5c45e7b86d38725a4ff49f6746f5353 (diff) | |
powerpc: Make single-stepping emulation (mostly) usable on 32-bit
The sc instruction emulation can't be done the same way on 32-bit
as 64-bit yet, but this should work OK.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/lib/sstep.c')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index e79123d1485c..666c2aa55016 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -10,13 +10,18 @@ */ #include <linux/kernel.h> #include <linux/ptrace.h> +#include <linux/config.h> #include <asm/sstep.h> #include <asm/processor.h> extern char system_call_common[]; +#ifdef CONFIG_PPC64 /* Bits in SRR1 that are copied from MSR */ #define MSR_MASK 0xffffffff87c0ffff +#else +#define MSR_MASK 0x87c0ffff +#endif /* * Determine whether a conditional branch instruction would branch. @@ -66,6 +71,7 @@ int emulate_step(struct pt_regs *regs, unsigned int instr) if (branch_taken(instr, regs)) regs->nip = imm; return 1; +#ifdef CONFIG_PPC64 case 17: /* sc */ /* * N.B. this uses knowledge about how the syscall @@ -79,6 +85,7 @@ int emulate_step(struct pt_regs *regs, unsigned int instr) regs->nip = (unsigned long) &system_call_common; regs->msr = MSR_KERNEL; return 1; +#endif case 18: /* b */ imm = instr & 0x03fffffc; if (imm & 0x02000000) @@ -121,6 +128,15 @@ int emulate_step(struct pt_regs *regs, unsigned int instr) if ((regs->msr & MSR_SF) == 0) regs->nip &= 0xffffffffUL; return 1; + case 0x124: /* mtmsr */ + imm = regs->gpr[rd]; + if ((imm & MSR_RI) == 0) + /* can't step mtmsr that would clear MSR_RI */ + return -1; + regs->msr = imm; + regs->nip += 4; + return 1; +#ifdef CONFIG_PPC64 case 0x164: /* mtmsrd */ /* only MSR_EE and MSR_RI get changed if bit 15 set */ /* mtmsrd doesn't change MSR_HV and MSR_ME */ @@ -135,6 +151,7 @@ int emulate_step(struct pt_regs *regs, unsigned int instr) if ((imm & MSR_SF) == 0) regs->nip &= 0xffffffffUL; return 1; +#endif } } return 0; |