derek.holloway
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73 lines
2.0 KiB
ArmAsm
73 lines
2.0 KiB
ArmAsm
# mach: bpf
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# sim: --skb-data-offset=0x20
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# output: pass\nexit 0 (0x0)\n
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/* ldabs.s
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Tests for non-generic BPF load instructions in simulator.
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These instructions (ld{abs,ind}{b,h,w,dw}) are used to access
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kernel socket data from BPF programs for high performance filters.
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Register r6 is an implicit input holding a pointer to a struct sk_buff.
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Register r0 is an implicit output, holding the fetched data.
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e.g.
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ldabsw means:
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r0 = ntohl (*(u32 *) (((struct sk_buff *)r6)->data + imm32))
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ldindw means
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r0 = ntohl (*(u32 *) (((struct sk_buff *)r6)->data + src_reg + imm32)) */
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.include "testutils.inc"
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.text
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.global main
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.type main, @function
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main:
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/* R6 holds a pointer to a struct sk_buff, which we pretend
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exists at 0x1000 */
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mov %r6, 0x1000
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/* We configure skb-data-offset=0x20
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This specifies offsetof(struct sk_buff, data), where the field 'data'
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is a pointer a data buffer, in this case at 0x2000 */
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stw [%r6+0x20], 0x2000
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/* Write the value 0x7eadbeef into memory at 0x2004
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i.e. offset 4 within the data buffer pointed to by
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((struct sk_buff *)r6)->data */
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stw [%r6+0x1004], 0x0eadbeef
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/* Now load data[4] into r0 using the ldabsw instruction */
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ldabsw 0x4
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/* ...and compare to what we expect */
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fail_ne32 %r0, 0x0eadbeef
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/* Repeat for a half-word (2-bytes) */
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sth [%r6+0x1008], 0x1234
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ldabsh 0x8
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fail_ne32 %r0, 0x1234
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/* Repeat for a single byte */
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stb [%r6+0x1010], 0x5a
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ldabsb 0x10
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fail_ne32 %r0, 0x5a
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/* Now, we do the same for the indirect loads */
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mov %r7, 0x100
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stw [%r6+0x1100], 0x0eedbeef
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ldindw %r7, 0x0
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fail_ne32 %r0, 0x0eedbeef
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/* half-word */
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sth [%r6+0x1104], 0x6789
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ldindh %r7, 0x4
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fail_ne32 %r0, 0x6789
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/* byte */
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stb [%r6+0x1108], 0x5f
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ldindb %r7, 0x8
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fail_ne32 %r0, 0x5f
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pass
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