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solib-darwin: support PIE for spawned processes.

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solib-darwin is now able to read the load address of the executable
before any inferior execution.
This commit is contained in:
Tristan Gingold
2015-11-23 11:45:05 +01:00
parent 3eb831e0ca
commit ad2073b0b4
3 changed files with 113 additions and 35 deletions
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14
gdb/darwin-nat.c
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@ -1965,7 +1965,7 @@ darwin_read_write_inferior (task_t task, CORE_ADDR addr,
}
/* Read LENGTH bytes at offset ADDR of task_dyld_info for TASK, and copy them
to RDADDR.
to RDADDR (in big endian).
Return 0 on failure; number of bytes read / written otherwise. */
#ifdef TASK_DYLD_INFO_COUNT
@ -1979,17 +1979,17 @@ darwin_read_dyld_info (task_t task, CORE_ADDR addr, gdb_byte *rdaddr,
int sz = TASK_DYLD_INFO_COUNT * sizeof (natural_t);
kern_return_t kret;
if (addr >= sz)
if (addr != 0 || length > sizeof (mach_vm_address_t))
return TARGET_XFER_EOF;
kret = task_info (task, TASK_DYLD_INFO, (task_info_t) &task_dyld_info, &count);
kret = task_info (task, TASK_DYLD_INFO,
(task_info_t) &task_dyld_info, &count);
MACH_CHECK_ERROR (kret);
if (kret != KERN_SUCCESS)
return TARGET_XFER_E_IO;
/* Truncate. */
if (addr + length > sz)
length = sz - addr;
memcpy (rdaddr, (char *)&task_dyld_info + addr, length);
store_unsigned_integer (rdaddr, length, BFD_ENDIAN_BIG,
task_dyld_info.all_image_info_addr);
*xfered_len = (ULONGEST) length;
return TARGET_XFER_OK;
}