From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@chromium.org,
naveen.n.rao@linux.ibm.com, sandipan@linux.ibm.com
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [RFC PATCH v1 5/7] powerpc/bpf: Change values of SEEN_ flags
Date: Wed, 16 Dec 2020 10:07:35 +0000 (UTC) [thread overview]
Message-ID: <ceea0970692b967990cd8ac6bf01c222541b83e2.1608112797.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1608112796.git.christophe.leroy@csgroup.eu>
Because PPC32 will use more non volatile registers,
move SEEN_ flags to positions 0-2 which corresponds to special
registers.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/net/bpf_jit.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index b34abfce15a6..fb4656986fb9 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -108,18 +108,18 @@ static inline bool is_nearbranch(int offset)
#define COND_LT (CR0_LT | COND_CMP_TRUE)
#define COND_LE (CR0_GT | COND_CMP_FALSE)
-#define SEEN_FUNC 0x1000 /* might call external helpers */
-#define SEEN_STACK 0x2000 /* uses BPF stack */
-#define SEEN_TAILCALL 0x4000 /* uses tail calls */
+#define SEEN_FUNC 0x20000000 /* might call external helpers */
+#define SEEN_STACK 0x40000000 /* uses BPF stack */
+#define SEEN_TAILCALL 0x80000000 /* uses tail calls */
struct codegen_context {
/*
* This is used to track register usage as well
* as calls to external helpers.
* - register usage is tracked with corresponding
- * bits (r3-r10 and r27-r31)
+ * bits (r3-r31)
* - rest of the bits can be used to track other
- * things -- for now, we use bits 16 to 23
+ * things -- for now, we use bits 0 to 2
* encoded in SEEN_* macros above
*/
unsigned int seen;
--
2.25.0
next prev parent reply other threads:[~2020-12-16 10:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 10:07 [RFC PATCH v1 0/7] Implement EBPF on powerpc32 Christophe Leroy
2020-12-16 10:07 ` [RFC PATCH v1 1/7] powerpc/bpf: Remove classical BPF support for PPC32 Christophe Leroy
2020-12-16 10:07 ` [RFC PATCH v1 2/7] powerpc/bpf: Change register numbering for bpf_set/is_seen_register() Christophe Leroy
2020-12-16 10:07 ` [RFC PATCH v1 3/7] powerpc/bpf: Move common helpers into bpf_jit.h Christophe Leroy
2020-12-16 10:07 ` [RFC PATCH v1 4/7] powerpc/bpf: Move common functions into bpf_jit_comp.c Christophe Leroy
2020-12-16 10:07 ` Christophe Leroy [this message]
2020-12-16 10:07 ` [RFC PATCH v1 6/7] powerpc/asm: Add some opcodes in asm/ppc-opcode.h for PPC32 eBPF Christophe Leroy
2020-12-16 10:07 ` [RFC PATCH v1 7/7] powerpc/bpf: Implement extended BPF on PPC32 Christophe Leroy
2020-12-17 6:11 ` Alexei Starovoitov
2020-12-17 9:54 ` Christophe Leroy
2020-12-18 19:33 ` Andrii Nakryiko
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