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selftests/bpf: Introduce cond_break_label

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Add a new cond_break_label macro that jumps to the specified label when
the cond_break termination check fires, and allows us to better handle
the uncontrolled termination of the loop.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250306035431.2186189-2-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2025-03-05 19:54:29 -08:00 committed by Alexei Starovoitov
parent dc438a9bc7
commit 4b7ede0be3
1 changed files with 9 additions and 6 deletions
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15
tools/testing/selftests/bpf/bpf_experimental.h
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@ -368,12 +368,12 @@ l_true: \
ret; \
})
#define cond_break \
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("may_goto %l[l_break]" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_break: expr; \
l_continue:; \
})
#else
@ -392,7 +392,7 @@ l_true: \
ret; \
})
#define cond_break \
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
@ -400,7 +400,7 @@ l_true: \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_break: expr; \
l_continue:; \
})
#else
@ -418,7 +418,7 @@ l_true: \
ret; \
})
#define cond_break \
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
@ -426,12 +426,15 @@ l_true: \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: break; \
l_break: expr; \
l_continue:; \
})
#endif
#endif
#define cond_break __cond_break(break)
#define cond_break_label(label) __cond_break(goto label)
#ifndef bpf_nop_mov
#define bpf_nop_mov(var) \
asm volatile("%[reg]=%[reg]"::[reg]"r"((short)var))