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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-11-26 20:43:29 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-23 13:31:14 +0300 |
| commit | 39413ae009674c6ba745850515b551bbb9d6374b (patch) | |
| tree | b743c9950361f2d2246166aac9ad2554be1dc28d /arch/powerpc/include/asm | |
| parent | 991d656d722dbc783481f408d6e4cbcce2e8bb78 (diff) | |
| download | linux-39413ae009674c6ba745850515b551bbb9d6374b.tar.xz | |
powerpc/hw_breakpoints: Rewrite 8xx breakpoints to allow any address range size.
Unlike standard powerpc, Powerpc 8xx doesn't have SPRN_DABR, but
it has a breakpoint support based on a set of comparators which
allow more flexibility.
Commit 4ad8622dc548 ("powerpc/8xx: Implement hw_breakpoint")
implemented breakpoints by emulating the DABR behaviour. It did
this by setting one comparator the match 4 bytes at breakpoint address
and the other comparator to match 4 bytes at breakpoint address + 4.
Rewrite 8xx hw_breakpoint to make breakpoints match all addresses
defined by the breakpoint address and length by making full use of
comparators.
Now, comparator E is set to match any address greater than breakpoint
address minus one. Comparator F is set to match any address lower than
breakpoint address plus breakpoint length. Addresses are aligned
to 32 bits.
When the breakpoint range starts at address 0, the breakpoint is set
to match comparator F only. When the breakpoint range end at address
0xffffffff, the breakpoint is set to match comparator E only.
Otherwise the breakpoint is set to match comparator E and F.
At the same time, use registers bit names instead of hardcoded values.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/05105deeaf63bc02151aea2cdeaf525534e0e9d4.1574790198.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/hw_breakpoint.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/reg_8xx.h | 14 |
2 files changed, 18 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h index 27ac6f5d2891..f2f8d8aa8e3b 100644 --- a/arch/powerpc/include/asm/hw_breakpoint.h +++ b/arch/powerpc/include/asm/hw_breakpoint.h @@ -34,7 +34,11 @@ struct arch_hw_breakpoint { #define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \ HW_BRK_TYPE_HYP) +#ifdef CONFIG_PPC_8xx +#define HW_BREAKPOINT_ALIGN 0x3 +#else #define HW_BREAKPOINT_ALIGN 0x7 +#endif #define DABR_MAX_LEN 8 #define DAWR_MAX_LEN 512 diff --git a/arch/powerpc/include/asm/reg_8xx.h b/arch/powerpc/include/asm/reg_8xx.h index 07df35ee8cbc..299ee7be0f67 100644 --- a/arch/powerpc/include/asm/reg_8xx.h +++ b/arch/powerpc/include/asm/reg_8xx.h @@ -35,7 +35,21 @@ #define SPRN_CMPE 152 #define SPRN_CMPF 153 #define SPRN_LCTRL1 156 +#define LCTRL1_CTE_GT 0xc0000000 +#define LCTRL1_CTF_LT 0x14000000 +#define LCTRL1_CRWE_RW 0x00000000 +#define LCTRL1_CRWE_RO 0x00040000 +#define LCTRL1_CRWE_WO 0x000c0000 +#define LCTRL1_CRWF_RW 0x00000000 +#define LCTRL1_CRWF_RO 0x00010000 +#define LCTRL1_CRWF_WO 0x00030000 #define SPRN_LCTRL2 157 +#define LCTRL2_LW0EN 0x80000000 +#define LCTRL2_LW0LA_E 0x00000000 +#define LCTRL2_LW0LA_F 0x04000000 +#define LCTRL2_LW0LA_EandF 0x08000000 +#define LCTRL2_LW0LADC 0x02000000 +#define LCTRL2_SLW0EN 0x00000002 #ifdef CONFIG_PPC_8xx #define SPRN_ICTRL 158 #endif |