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bpf jit: Let the powerpc jit handle negative offsets 

Now the helper function from filter.c for negative offsets is exported,
it can be used it in the jit to handle negative offsets.

First modify the asm load helper functions to handle:
- know positive offsets
- know negative offsets
- any offset

then the compiler can be modified to explicitly use these helper
when appropriate.

This fixes the case of a negative X register and allows to lift
the restriction that bpf programs with negative offsets can't
be jited.

Tested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jan Seiffert <kaffeemonster@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Seiffert 2012-04-29 19:02:19 +00:00 committed by David S. Miller
parent 518fbf9cdf
commit 05be18241e
3 changed files with 111 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/net/bpf_jit.h
View File

@ -48,7 +48,13 @@
/*
* Assembly helpers from arch/powerpc/net/bpf_jit.S:
*/
extern u8 sk_load_word[], sk_load_half[], sk_load_byte[], sk_load_byte_msh[];
#define DECLARE_LOAD_FUNC(func) \
extern u8 func[], func##_negative_offset[], func##_positive_offset[]
DECLARE_LOAD_FUNC(sk_load_word);
DECLARE_LOAD_FUNC(sk_load_half);
DECLARE_LOAD_FUNC(sk_load_byte);
DECLARE_LOAD_FUNC(sk_load_byte_msh);
#define FUNCTION_DESCR_SIZE 24

108
arch/powerpc/net/bpf_jit_64.S
View File

@ -31,14 +31,13 @@
* then branch directly to slow_path_XXX if required. (In fact, could
* load a spare GPR with the address of slow_path_generic and pass size
* as an argument, making the call site a mtlr, li and bllr.)
*
* Technically, the "is addr < 0" check is unnecessary & slowing down
* the ABS path, as it's statically checked on generation.
*/
.globl sk_load_word
sk_load_word:
cmpdi r_addr, 0
blt bpf_error
blt bpf_slow_path_word_neg
.globl sk_load_word_positive_offset
sk_load_word_positive_offset:
/* Are we accessing past headlen? */
subi r_scratch1, r_HL, 4
cmpd r_scratch1, r_addr
@ -51,7 +50,9 @@ sk_load_word:
.globl sk_load_half
sk_load_half:
cmpdi r_addr, 0
blt bpf_error
blt bpf_slow_path_half_neg
.globl sk_load_half_positive_offset
sk_load_half_positive_offset:
subi r_scratch1, r_HL, 2
cmpd r_scratch1, r_addr
blt bpf_slow_path_half
@ -61,7 +62,9 @@ sk_load_half:
.globl sk_load_byte
sk_load_byte:
cmpdi r_addr, 0
blt bpf_error
blt bpf_slow_path_byte_neg
.globl sk_load_byte_positive_offset
sk_load_byte_positive_offset:
cmpd r_HL, r_addr
ble bpf_slow_path_byte
lbzx r_A, r_D, r_addr
@ -69,22 +72,20 @@ sk_load_byte:
/*
* BPF_S_LDX_B_MSH: ldxb 4*([offset]&0xf)
* r_addr is the offset value, already known positive
* r_addr is the offset value
*/
.globl sk_load_byte_msh
sk_load_byte_msh:
cmpdi r_addr, 0
blt bpf_slow_path_byte_msh_neg
.globl sk_load_byte_msh_positive_offset
sk_load_byte_msh_positive_offset:
cmpd r_HL, r_addr
ble bpf_slow_path_byte_msh
lbzx r_X, r_D, r_addr
rlwinm r_X, r_X, 2, 32-4-2, 31-2
blr
bpf_error:
/* Entered with cr0 = lt */
li r3, 0
/* Generated code will 'blt epilogue', returning 0. */
blr
/* Call out to skb_copy_bits:
* We'll need to back up our volatile regs first; we have
* local variable space at r1+(BPF_PPC_STACK_BASIC).
@ -136,3 +137,84 @@ bpf_slow_path_byte_msh:
lbz r_X, BPF_PPC_STACK_BASIC+(2*8)(r1)
rlwinm r_X, r_X, 2, 32-4-2, 31-2
blr
/* Call out to bpf_internal_load_pointer_neg_helper:
* We'll need to back up our volatile regs first; we have
* local variable space at r1+(BPF_PPC_STACK_BASIC).
* Allocate a new stack frame here to remain ABI-compliant in
* stashing LR.
*/
#define sk_negative_common(SIZE) \
mflr r0; \
std r0, 16(r1); \
/* R3 goes in parameter space of caller's frame */ \
std r_skb, (BPF_PPC_STACKFRAME+48)(r1); \
std r_A, (BPF_PPC_STACK_BASIC+(0*8))(r1); \
std r_X, (BPF_PPC_STACK_BASIC+(1*8))(r1); \
stdu r1, -BPF_PPC_SLOWPATH_FRAME(r1); \
/* R3 = r_skb, as passed */ \
mr r4, r_addr; \
li r5, SIZE; \
bl bpf_internal_load_pointer_neg_helper; \
/* R3 != 0 on success */ \
addi r1, r1, BPF_PPC_SLOWPATH_FRAME; \
ld r0, 16(r1); \
ld r_A, (BPF_PPC_STACK_BASIC+(0*8))(r1); \
ld r_X, (BPF_PPC_STACK_BASIC+(1*8))(r1); \
mtlr r0; \
cmpldi r3, 0; \
beq bpf_error_slow; /* cr0 = EQ */ \
mr r_addr, r3; \
ld r_skb, (BPF_PPC_STACKFRAME+48)(r1); \
/* Great success! */
bpf_slow_path_word_neg:
lis r_scratch1,-32 /* SKF_LL_OFF */
cmpd r_addr, r_scratch1 /* addr < SKF_* */
blt bpf_error /* cr0 = LT */
.globl sk_load_word_negative_offset
sk_load_word_negative_offset:
sk_negative_common(4)
lwz r_A, 0(r_addr)
blr
bpf_slow_path_half_neg:
lis r_scratch1,-32 /* SKF_LL_OFF */
cmpd r_addr, r_scratch1 /* addr < SKF_* */
blt bpf_error /* cr0 = LT */
.globl sk_load_half_negative_offset
sk_load_half_negative_offset:
sk_negative_common(2)
lhz r_A, 0(r_addr)
blr
bpf_slow_path_byte_neg:
lis r_scratch1,-32 /* SKF_LL_OFF */
cmpd r_addr, r_scratch1 /* addr < SKF_* */
blt bpf_error /* cr0 = LT */
.globl sk_load_byte_negative_offset
sk_load_byte_negative_offset:
sk_negative_common(1)
lbz r_A, 0(r_addr)
blr
bpf_slow_path_byte_msh_neg:
lis r_scratch1,-32 /* SKF_LL_OFF */
cmpd r_addr, r_scratch1 /* addr < SKF_* */
blt bpf_error /* cr0 = LT */
.globl sk_load_byte_msh_negative_offset
sk_load_byte_msh_negative_offset:
sk_negative_common(1)
lbz r_X, 0(r_addr)
rlwinm r_X, r_X, 2, 32-4-2, 31-2
blr
bpf_error_slow:
/* fabricate a cr0 = lt */
li r_scratch1, -1
cmpdi r_scratch1, 0
bpf_error:
/* Entered with cr0 = lt */
li r3, 0
/* Generated code will 'blt epilogue', returning 0. */
blr

26
arch/powerpc/net/bpf_jit_comp.c
View File

@ -127,6 +127,9 @@ static void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)
PPC_BLR();
}
#define CHOOSE_LOAD_FUNC(K, func) \
((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)
/* Assemble the body code between the prologue & epilogue. */
static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
struct codegen_context *ctx,
@ -391,21 +394,16 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
/*** Absolute loads from packet header/data ***/
case BPF_S_LD_W_ABS:
func = sk_load_word;
func = CHOOSE_LOAD_FUNC(K, sk_load_word);
goto common_load;
case BPF_S_LD_H_ABS:
func = sk_load_half;
func = CHOOSE_LOAD_FUNC(K, sk_load_half);
goto common_load;
case BPF_S_LD_B_ABS:
func = sk_load_byte;
func = CHOOSE_LOAD_FUNC(K, sk_load_byte);
common_load:
/*
* Load from [K]. Reference with the (negative)
* SKF_NET_OFF/SKF_LL_OFF offsets is unsupported.
*/
/* Load from [K]. */
ctx->seen |= SEEN_DATAREF;
if ((int)K < 0)
return -ENOTSUPP;
PPC_LI64(r_scratch1, func);
PPC_MTLR(r_scratch1);
PPC_LI32(r_addr, K);
@ -429,7 +427,7 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
common_load_ind:
/*
* Load from [X + K]. Negative offsets are tested for
* in the helper functions, and result in a 'ret 0'.
* in the helper functions.
*/
ctx->seen |= SEEN_DATAREF | SEEN_XREG;
PPC_LI64(r_scratch1, func);
@ -443,13 +441,7 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
break;
case BPF_S_LDX_B_MSH:
/*
* x86 version drops packet (RET 0) when K<0, whereas
* interpreter does allow K<0 (__load_pointer, special
* ancillary data). common_load returns ENOTSUPP if K<0,
* so we fall back to interpreter & filter works.
*/
func = sk_load_byte_msh;
func = CHOOSE_LOAD_FUNC(K, sk_load_byte_msh);
goto common_load;
break;