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sim: bpf: remove support for ldinddw and ldabsdw instructions

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This patch removes support for the two instructions above from the GNU
simulator, including the corresponding tests.  These instructions do
not really exist in BPF and are not recognized as such by the kernel
verifier.  This has now been pointed out during the standardization of
the BPF ISA.

Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com>
This commit is contained in:
Jose E. Marchesi 2024-01-29 22:25:19 +01:00
parent 878e894801
commit 920d9f0b39
2 changed files with 0 additions and 28 deletions
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13
sim/bpf/bpf-sim.c
View File

@ -943,13 +943,6 @@ execute (SIM_CPU *cpu, struct bpf_insn *insn)
bpf_read_u64 (cpu, bpf_regs[BPF_R6] + skb_data_offset)
+ bpf_regs[insn->src] + insn->imm32);
break;
case BPF_INSN_LDINDDW:
BPF_TRACE ("BPF_INSN_LDINDDW\n");
bpf_regs[BPF_R0] = bpf_read_u64 (cpu,
bpf_read_u64 (cpu, bpf_regs[BPF_R6] + skb_data_offset)
+ bpf_regs[insn->src] + insn->imm32);
break;
/* Absolute load instructions. */
case BPF_INSN_LDABSB:
BPF_TRACE ("BPF_INSN_LDABSB\n");
bpf_regs[BPF_R0] = bpf_read_u8 (cpu,
@ -968,12 +961,6 @@ execute (SIM_CPU *cpu, struct bpf_insn *insn)
bpf_read_u64 (cpu, bpf_regs[BPF_R6] + skb_data_offset)
+ insn->imm32);
break;
case BPF_INSN_LDABSDW:
BPF_TRACE ("BPF_INSN_LDABSDW\n");
bpf_regs[BPF_R0] = bpf_read_u64 (cpu,
bpf_read_u64 (cpu, bpf_regs[BPF_R6] + skb_data_offset)
+ insn->imm32);
break;
/* Generic load instructions (to register.) */
case BPF_INSN_LDXB:
BPF_TRACE ("BPF_INSN_LDXB\n");

15
sim/testsuite/bpf/ldabs.s
View File

@ -52,14 +52,6 @@ main:
ldabsb 0x10
fail_ne32 %r0, 0x5a
/* Repeat for a double-word (8-byte)
(note: fail_ne macro uses r0, so copy to another r1 to compare) */
lddw %r2, 0x1234deadbeef5678
stxdw [%r6+0x1018], %r2
ldabsdw 0x18
mov %r1, %r0
fail_ne %r1, 0x1234deadbeef5678
/* Now, we do the same for the indirect loads */
mov %r7, 0x100
stw [%r6+0x1100], 0x0eedbeef
@ -77,11 +69,4 @@ main:
ldindb %r7, 0x8
fail_ne32 %r0, 0x5f
/* double-word */
lddw %r2, 0xcafe12345678d00d
stxdw [%r6+0x1110], %r2
ldinddw %r7, 0x10
mov %r1, %r0
fail_ne %r1, 0xcafe12345678d00d
pass