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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>
hifive-unleashed-5.1
Russell King 2018-01-13 21:26:14 +00:00
parent d1220efd23
commit 70ec3a6c2c
1 changed files with 21 additions and 21 deletions
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42
arch/arm/net/bpf_jit_32.c
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@ -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