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riscv: Add hwprobe vdso call support
The new riscv_hwprobe syscall also comes with a vDSO for faster answers to your most common questions. Call in today to speak with a kernel representative near you! Signed-off-by: Evan Green <evan@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -71,6 +71,16 @@ PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t,
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# ifdef HAVE_GET_TBFREQ
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PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO;
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# endif
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/* RISC-V specific ones. */
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# ifdef HAVE_RISCV_HWPROBE
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PROCINFO_CLASS int (*_dl_vdso_riscv_hwprobe)(void *,
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size_t,
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size_t,
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unsigned long *,
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unsigned int) RELRO;
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# endif
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#endif
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#undef RELRO
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@ -47,6 +47,9 @@ setup_vdso_pointers (void)
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#ifdef HAVE_GET_TBFREQ
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GLRO(dl_vdso_get_tbfreq) = dl_vdso_vsym (HAVE_GET_TBFREQ);
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#endif
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#ifdef HAVE_RISCV_HWPROBE
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GLRO(dl_vdso_riscv_hwprobe) = dl_vdso_vsym (HAVE_RISCV_HWPROBE);
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#endif
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}
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#endif
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@ -28,8 +28,8 @@ int __riscv_hwprobe (struct riscv_hwprobe *pairs, size_t pair_count,
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{
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int r;
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r = INTERNAL_SYSCALL_CALL (riscv_hwprobe, pairs, pair_count,
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cpu_count, cpus, flags);
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r = INTERNAL_VSYSCALL (riscv_hwprobe, 5, pairs, pair_count,
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cpu_count, cpus, flags);
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/* Negate negative errno values to match pthreads API. */
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return -r;
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@ -156,6 +156,7 @@
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/* List of system calls which are supported as vsyscalls (for RV32 and
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RV64). */
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# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
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# define HAVE_RISCV_HWPROBE "__vdso_riscv_hwprobe"
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# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
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# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
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