net: filter: Just In Time compiler for sparc
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/net/bpf_jit_asm.S b/arch/sparc/net/bpf_jit_asm.S
new file mode 100644
index 0000000..fdc6932
--- /dev/null
+++ b/arch/sparc/net/bpf_jit_asm.S
@@ -0,0 +1,199 @@
+#include <asm/ptrace.h>
+
+#include "bpf_jit.h"
+
+#ifdef CONFIG_SPARC64
+#define SAVE_SZ 176
+#define SCRATCH_OFF STACK_BIAS + 128
+#define BE_PTR(label) be,pn %xcc, label
+#else
+#define SAVE_SZ 96
+#define SCRATCH_OFF 72
+#define BE_PTR(label) be label
+#endif
+
+#define SKF_MAX_NEG_OFF (-0x200000) /* SKF_LL_OFF from filter.h */
+
+ .text
+ .globl bpf_jit_load_word
+bpf_jit_load_word:
+ cmp r_OFF, 0
+ bl bpf_slow_path_word_neg
+ nop
+ .globl bpf_jit_load_word_positive_offset
+bpf_jit_load_word_positive_offset:
+ sub r_HEADLEN, r_OFF, r_TMP
+ cmp r_TMP, 3
+ ble bpf_slow_path_word
+ add r_SKB_DATA, r_OFF, r_TMP
+ andcc r_TMP, 3, %g0
+ bne load_word_unaligned
+ nop
+ retl
+ ld [r_SKB_DATA + r_OFF], r_A
+load_word_unaligned:
+ ldub [r_TMP + 0x0], r_OFF
+ ldub [r_TMP + 0x1], r_TMP2
+ sll r_OFF, 8, r_OFF
+ or r_OFF, r_TMP2, r_OFF
+ ldub [r_TMP + 0x2], r_TMP2
+ sll r_OFF, 8, r_OFF
+ or r_OFF, r_TMP2, r_OFF
+ ldub [r_TMP + 0x3], r_TMP2
+ sll r_OFF, 8, r_OFF
+ retl
+ or r_OFF, r_TMP2, r_A
+
+ .globl bpf_jit_load_half
+bpf_jit_load_half:
+ cmp r_OFF, 0
+ bl bpf_slow_path_half_neg
+ nop
+ .globl bpf_jit_load_half_positive_offset
+bpf_jit_load_half_positive_offset:
+ sub r_HEADLEN, r_OFF, r_TMP
+ cmp r_TMP, 1
+ ble bpf_slow_path_half
+ add r_SKB_DATA, r_OFF, r_TMP
+ andcc r_TMP, 1, %g0
+ bne load_half_unaligned
+ nop
+ retl
+ lduh [r_SKB_DATA + r_OFF], r_A
+load_half_unaligned:
+ ldub [r_TMP + 0x0], r_OFF
+ ldub [r_TMP + 0x1], r_TMP2
+ sll r_OFF, 8, r_OFF
+ retl
+ or r_OFF, r_TMP2, r_A
+
+ .globl bpf_jit_load_byte
+bpf_jit_load_byte:
+ cmp r_OFF, 0
+ bl bpf_slow_path_byte_neg
+ nop
+ .globl bpf_jit_load_byte_positive_offset
+bpf_jit_load_byte_positive_offset:
+ cmp r_OFF, r_HEADLEN
+ bge bpf_slow_path_byte
+ nop
+ retl
+ ldub [r_SKB_DATA + r_OFF], r_A
+
+ .globl bpf_jit_load_byte_msh
+bpf_jit_load_byte_msh:
+ cmp r_OFF, 0
+ bl bpf_slow_path_byte_msh_neg
+ nop
+ .globl bpf_jit_load_byte_msh_positive_offset
+bpf_jit_load_byte_msh_positive_offset:
+ cmp r_OFF, r_HEADLEN
+ bge bpf_slow_path_byte_msh
+ nop
+ ldub [r_SKB_DATA + r_OFF], r_OFF
+ and r_OFF, 0xf, r_OFF
+ retl
+ sll r_OFF, 2, r_X
+
+#define bpf_slow_path_common(LEN) \
+ save %sp, -SAVE_SZ, %sp; \
+ mov %i0, %o0; \
+ mov r_OFF, %o1; \
+ add %fp, SCRATCH_OFF, %o2; \
+ call skb_copy_bits; \
+ mov (LEN), %o3; \
+ cmp %o0, 0; \
+ restore;
+
+bpf_slow_path_word:
+ bpf_slow_path_common(4)
+ bl bpf_error
+ ld [%sp + SCRATCH_OFF], r_A
+ retl
+ nop
+bpf_slow_path_half:
+ bpf_slow_path_common(2)
+ bl bpf_error
+ lduh [%sp + SCRATCH_OFF], r_A
+ retl
+ nop
+bpf_slow_path_byte:
+ bpf_slow_path_common(1)
+ bl bpf_error
+ ldub [%sp + SCRATCH_OFF], r_A
+ retl
+ nop
+bpf_slow_path_byte_msh:
+ bpf_slow_path_common(1)
+ bl bpf_error
+ ldub [%sp + SCRATCH_OFF], r_A
+ and r_OFF, 0xf, r_OFF
+ retl
+ sll r_OFF, 2, r_X
+
+#define bpf_negative_common(LEN) \
+ save %sp, -SAVE_SZ, %sp; \
+ mov %i0, %o0; \
+ mov r_OFF, %o1; \
+ call bpf_internal_load_pointer_neg_helper; \
+ mov (LEN), %o2; \
+ mov %o0, r_TMP; \
+ cmp %o0, 0; \
+ BE_PTR(bpf_error); \
+ restore;
+
+bpf_slow_path_word_neg:
+ sethi %hi(SKF_MAX_NEG_OFF), r_TMP
+ cmp r_OFF, r_TMP
+ bl bpf_error
+ nop
+ .globl bpf_jit_load_word_negative_offset
+bpf_jit_load_word_negative_offset:
+ bpf_negative_common(4)
+ andcc r_TMP, 3, %g0
+ bne load_word_unaligned
+ nop
+ retl
+ ld [r_TMP], r_A
+
+bpf_slow_path_half_neg:
+ sethi %hi(SKF_MAX_NEG_OFF), r_TMP
+ cmp r_OFF, r_TMP
+ bl bpf_error
+ nop
+ .globl bpf_jit_load_half_negative_offset
+bpf_jit_load_half_negative_offset:
+ bpf_negative_common(2)
+ andcc r_TMP, 1, %g0
+ bne load_half_unaligned
+ nop
+ retl
+ lduh [r_TMP], r_A
+
+bpf_slow_path_byte_neg:
+ sethi %hi(SKF_MAX_NEG_OFF), r_TMP
+ cmp r_OFF, r_TMP
+ bl bpf_error
+ nop
+ .globl bpf_jit_load_byte_negative_offset
+bpf_jit_load_byte_negative_offset:
+ bpf_negative_common(1)
+ retl
+ ldub [r_TMP], r_A
+
+bpf_slow_path_byte_msh_neg:
+ sethi %hi(SKF_MAX_NEG_OFF), r_TMP
+ cmp r_OFF, r_TMP
+ bl bpf_error
+ nop
+ .globl bpf_jit_load_byte_msh_negative_offset
+bpf_jit_load_byte_msh_negative_offset:
+ bpf_negative_common(1)
+ ldub [r_TMP], r_OFF
+ and r_OFF, 0xf, r_OFF
+ retl
+ sll r_OFF, 2, r_X
+
+bpf_error:
+ jmpl r_saved_O7 + 8, %g0
+ clr %o0