summaryrefslogtreecommitdiff
path: root/arch/powerpc/net/bpf_jit_asm64.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/net/bpf_jit_asm64.S')
-rw-r--r--arch/powerpc/net/bpf_jit_asm64.S180
1 files changed, 0 insertions, 180 deletions
diff --git a/arch/powerpc/net/bpf_jit_asm64.S b/arch/powerpc/net/bpf_jit_asm64.S
deleted file mode 100644
index 7e4c51430b84..000000000000
--- a/arch/powerpc/net/bpf_jit_asm64.S
+++ /dev/null
@@ -1,180 +0,0 @@
-/*
- * bpf_jit_asm64.S: Packet/header access helper functions
- * for PPC64 BPF compiler.
- *
- * Copyright 2016, Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
- * IBM Corporation
- *
- * Based on bpf_jit_asm.S by Matt Evans
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <asm/ppc_asm.h>
-#include <asm/ptrace.h>
-#include "bpf_jit64.h"
-
-/*
- * All of these routines are called directly from generated code,
- * with the below register usage:
- * r27 skb pointer (ctx)
- * r25 skb header length
- * r26 skb->data pointer
- * r4 offset
- *
- * Result is passed back in:
- * r8 data read in host endian format (accumulator)
- *
- * r9 is used as a temporary register
- */
-
-#define r_skb r27
-#define r_hlen r25
-#define r_data r26
-#define r_off r4
-#define r_val r8
-#define r_tmp r9
-
-_GLOBAL_TOC(sk_load_word)
- cmpdi r_off, 0
- blt bpf_slow_path_word_neg
- b sk_load_word_positive_offset
-
-_GLOBAL_TOC(sk_load_word_positive_offset)
- /* Are we accessing past headlen? */
- subi r_tmp, r_hlen, 4
- cmpd r_tmp, r_off
- blt bpf_slow_path_word
- /* Nope, just hitting the header. cr0 here is eq or gt! */
- LWZX_BE r_val, r_data, r_off
- blr /* Return success, cr0 != LT */
-
-_GLOBAL_TOC(sk_load_half)
- cmpdi r_off, 0
- blt bpf_slow_path_half_neg
- b sk_load_half_positive_offset
-
-_GLOBAL_TOC(sk_load_half_positive_offset)
- subi r_tmp, r_hlen, 2
- cmpd r_tmp, r_off
- blt bpf_slow_path_half
- LHZX_BE r_val, r_data, r_off
- blr
-
-_GLOBAL_TOC(sk_load_byte)
- cmpdi r_off, 0
- blt bpf_slow_path_byte_neg
- b sk_load_byte_positive_offset
-
-_GLOBAL_TOC(sk_load_byte_positive_offset)
- cmpd r_hlen, r_off
- ble bpf_slow_path_byte
- lbzx r_val, r_data, r_off
- blr
-
-/*
- * Call out to skb_copy_bits:
- * Allocate a new stack frame here to remain ABI-compliant in
- * stashing LR.
- */
-#define bpf_slow_path_common(SIZE) \
- mflr r0; \
- std r0, PPC_LR_STKOFF(r1); \
- stdu r1, -(STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS)(r1); \
- mr r3, r_skb; \
- /* r4 = r_off as passed */ \
- addi r5, r1, STACK_FRAME_MIN_SIZE; \
- li r6, SIZE; \
- bl skb_copy_bits; \
- nop; \
- /* save r5 */ \
- addi r5, r1, STACK_FRAME_MIN_SIZE; \
- /* r3 = 0 on success */ \
- addi r1, r1, STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS; \
- ld r0, PPC_LR_STKOFF(r1); \
- mtlr r0; \
- cmpdi r3, 0; \
- blt bpf_error; /* cr0 = LT */
-
-bpf_slow_path_word:
- bpf_slow_path_common(4)
- /* Data value is on stack, and cr0 != LT */
- LWZX_BE r_val, 0, r5
- blr
-
-bpf_slow_path_half:
- bpf_slow_path_common(2)
- LHZX_BE r_val, 0, r5
- blr
-
-bpf_slow_path_byte:
- bpf_slow_path_common(1)
- lbzx r_val, 0, r5
- blr
-
-/*
- * Call out to bpf_internal_load_pointer_neg_helper
- */
-#define sk_negative_common(SIZE) \
- mflr r0; \
- std r0, PPC_LR_STKOFF(r1); \
- stdu r1, -STACK_FRAME_MIN_SIZE(r1); \
- mr r3, r_skb; \
- /* r4 = r_off, as passed */ \
- li r5, SIZE; \
- bl bpf_internal_load_pointer_neg_helper; \
- nop; \
- addi r1, r1, STACK_FRAME_MIN_SIZE; \
- ld r0, PPC_LR_STKOFF(r1); \
- mtlr r0; \
- /* R3 != 0 on success */ \
- cmpldi r3, 0; \
- beq bpf_error_slow; /* cr0 = EQ */
-
-bpf_slow_path_word_neg:
- lis r_tmp, -32 /* SKF_LL_OFF */
- cmpd r_off, r_tmp /* addr < SKF_* */
- blt bpf_error /* cr0 = LT */
- b sk_load_word_negative_offset
-
-_GLOBAL_TOC(sk_load_word_negative_offset)
- sk_negative_common(4)
- LWZX_BE r_val, 0, r3
- blr
-
-bpf_slow_path_half_neg:
- lis r_tmp, -32 /* SKF_LL_OFF */
- cmpd r_off, r_tmp /* addr < SKF_* */
- blt bpf_error /* cr0 = LT */
- b sk_load_half_negative_offset
-
-_GLOBAL_TOC(sk_load_half_negative_offset)
- sk_negative_common(2)
- LHZX_BE r_val, 0, r3
- blr
-
-bpf_slow_path_byte_neg:
- lis r_tmp, -32 /* SKF_LL_OFF */
- cmpd r_off, r_tmp /* addr < SKF_* */
- blt bpf_error /* cr0 = LT */
- b sk_load_byte_negative_offset
-
-_GLOBAL_TOC(sk_load_byte_negative_offset)
- sk_negative_common(1)
- lbzx r_val, 0, r3
- blr
-
-bpf_error_slow:
- /* fabricate a cr0 = lt */
- li r_tmp, -1
- cmpdi r_tmp, 0
-bpf_error:
- /*
- * Entered with cr0 = lt
- * Generated code will 'blt epilogue', returning 0.
- */
- li r_val, 0
- blr