Commit c426810f authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/bpf: Change values of SEEN_ flags 



Because PPC32 will use more non volatile registers,
move SEEN_ flags to positions 0-2 which corresponds to special
registers.

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/608faa1dc3ecfead649e15392abd07b00313d2ba.1616430991.git.christophe.leroy@csgroup.eu
parent 4ea76e90

arch/powerpc/net/bpf_jit.h

+5 −5
Original line number Diff line number Diff line
@@ -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;