linux-kernel - Re: [PATCH v4 3/4] perf inject: add jitdump mmap injection support

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Date:	Thu, 26 Mar 2015 10:00:12 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Stephane Eranian <eranian@...gle.com>, linux-kernel@...r.kernel.org
CC:	acme@...hat.com, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, jolsa@...hat.com, namhyung@...nel.org,
	cel@...ibm.com, sukadev@...ux.vnet.ibm.com, sonnyrao@...omium.org,
	johnmccutchan@...gle.com, dsahern@...il.com, pawel.moll@....com
Subject: Re: [PATCH v4 3/4] perf inject: add jitdump mmap injection support

<SNIP>

> +static int
> +jit_open(struct jit_buf_desc *jd, const char *name)
> +{
> +	struct jitheader header;
> +	struct jr_prefix *prefix;
> +	ssize_t bs, bsz = 0;
> +	void *n, *buf = NULL;
> +	int ret, retval = -1;
> +
> +	jd->in = fopen(name, "r");
> +	if (!jd->in)
> +		return -1;
> +
> +	bsz = hmax(sizeof(header), sizeof(*prefix));
> +
> +	buf = malloc(bsz);
> +	if (!buf)
> +		goto error;
> +
> +	ret = fread(buf, sizeof(header), 1, jd->in);
> +	if (ret != 1)
> +		goto error;
> +
> +	memcpy(&header, buf, sizeof(header));
> +
> +	if (header.magic != JITHEADER_MAGIC) {
> +		if (header.magic != JITHEADER_MAGIC_SW)
> +			goto error;
> +		jd->needs_bswap = 1;
> +	}
> +
> +	if (jd->needs_bswap) {
> +		header.version    = bswap_32(header.version);
> +		header.total_size = bswap_32(header.total_size);
> +		header.pid	  = bswap_32(header.pid);
> +		header.elf_mach   = bswap_32(header.elf_mach);
> +		header.timestamp  = bswap_32(header.timestamp);

timestamp is 64-bit


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