62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
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#include "inc.h"
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/*
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* Retrieve 'len' bytes from the memory of the traced process 'pid' at address
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* 'addr' and put the result in the buffer pointed to by 'ptr'. Return 0 on
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* success, or otherwise -1 with errno set appropriately.
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*/
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int
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mem_get_data(pid_t pid, vir_bytes addr, void * ptr, size_t len)
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{
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struct ptrace_range pr;
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if (len == 0) return 0;
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pr.pr_space = TS_DATA;
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pr.pr_addr = addr;
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pr.pr_size = len;
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pr.pr_ptr = ptr;
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return ptrace(T_GETRANGE, pid, &pr, 0);
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}
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/*
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* Retrieve 'len' bytes from the kernel structure memory of the traced process
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* 'pid' at offset 'addr' and put the result in the buffer pointed to by 'ptr'.
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* Return 0 on success, or otherwise -1 with errno set appropriately.
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*/
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int
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mem_get_user(pid_t pid, vir_bytes addr, void * ptr, size_t len)
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{
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long data;
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char *p;
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size_t off, chunk;
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if (len == 0) return 0;
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/* Align access to address. */
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off = addr & (sizeof(data) - 1);
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addr -= off;
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p = ptr;
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while (len > 0) {
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errno = 0;
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data = ptrace(T_GETUSER, pid, (void *)addr, 0);
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if (errno != 0) return -1;
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chunk = sizeof(data) - off;
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if (chunk > len)
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chunk = len;
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memcpy(p, (char *)&data + off, chunk);
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p += chunk;
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addr += chunk;
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len -= chunk;
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off = 0;
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}
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return 0;
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}
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