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authorPaul Mackerras <paulus@samba.org>2005-10-28 22:48:08 +1000
committerPaul Mackerras <paulus@samba.org>2005-10-28 22:48:08 +1000
commitc032524f0ddea5fcc3a2cece0d4a61f37e5ca9cd (patch)
treec4ece990e6083cfedc640a06f908bfe33fd344bd /arch/powerpc
parentd73e0c99f5c45e7b86d38725a4ff49f6746f5353 (diff)
downloadlinaro-lsk-c032524f0ddea5fcc3a2cece0d4a61f37e5ca9cd.tar.gz
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')
-rw-r--r--arch/powerpc/lib/sstep.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index e79123d1485..666c2aa5501 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;