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authorRussell King <rmk+kernel@armlinux.org.uk>2018-01-13 21:26:14 +0000
committerRussell King <rmk+kernel@armlinux.org.uk>2018-01-17 19:36:43 +0000
commit70ec3a6c2c11e4b0e107a65de943a082f9aff351 (patch)
tree8d342d7ef860cf6cb6600fdd4dbeda43a6e5123d /arch
parentd1220efd23484c72c82d5471f05daeb35b5d1916 (diff)
ARM: net: bpf: move stack documentation
Move the stack documentation towards the top of the file, where it's relevant for things like the register layout. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/net/bpf_jit_32.c42
1 files changed, 21 insertions, 21 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index d00a0eb0386e..e90229d58c77 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -27,6 +27,27 @@
int bpf_jit_enable __read_mostly;
+/*
+ * eBPF prog stack layout
+ *
+ * high
+ * original ARM_SP => +-----+ eBPF prologue
+ * |FP/LR|
+ * current ARM_FP => +-----+
+ * | ... | callee saved registers
+ * eBPF fp register => +-----+ <= (BPF_FP)
+ * | ... | eBPF JIT scratch space
+ * | | eBPF prog stack
+ * +-----+
+ * |RSVD | JIT scratchpad
+ * current ARM_SP => +-----+ <= (BPF_FP - STACK_SIZE)
+ * | |
+ * | ... | Function call stack
+ * | |
+ * +-----+
+ * low
+ */
+
#define STACK_OFFSET(k) (k)
#define TMP_REG_1 (MAX_BPF_JIT_REG + 0) /* TEMP Register 1 */
#define TMP_REG_2 (MAX_BPF_JIT_REG + 1) /* TEMP Register 2 */
@@ -1091,27 +1112,6 @@ static void build_prologue(struct jit_ctx *ctx)
u16 reg_set = 0;
- /*
- * eBPF prog stack layout
- *
- * high
- * original ARM_SP => +-----+ eBPF prologue
- * |FP/LR|
- * current ARM_FP => +-----+
- * | ... | callee saved registers
- * eBPF fp register => +-----+ <= (BPF_FP)
- * | ... | eBPF JIT scratch space
- * | | eBPF prog stack
- * +-----+
- * |RSVD | JIT scratchpad
- * current A64_SP => +-----+ <= (BPF_FP - STACK_SIZE)
- * | |
- * | ... | Function call stack
- * | |
- * +-----+
- * low
- */
-
/* Save callee saved registers. */
reg_set |= (1<<r4) | (1<<r5) | (1<<r6) | (1<<r7) | (1<<r8) | (1<<r10);
#ifdef CONFIG_FRAME_POINTER