Return a ZBI containing ZBI entries necessary to boot this system.
#include <zircon/syscalls.h> zx_status_t zx_system_mexec_payload_get(zx_handle_t resource, void* buffer, size_t buffer_size);
zx_system_mexec_payload_get() accepts a resource handle and a pointer/length corresponding to an output buffer. The head of the buffer is overwritten with non-bootable ZBI containing a sequence of entries that should be appended to a ZBI before passing that image to zx_system_mexec(); the tail of the buffer is left untouched.
resource must be of type ZX_RSRC_KIND_SYSTEM with base ZX_RSRC_SYSTEM_MEXEC_BASE.
buffer and buffer_size must point to a buffer that is no longer than 16KiB.
To use the zx_system_mexec_payload_get() function, you must specify kernel.enable-debugging-syscalls=true on the kernel command line. Otherwise, the function returns ZX_ERR_NOT_SUPPORTED.
resource must have resource kind ZX_RSRC_KIND_SYSTEM with base ZX_RSRC_SYSTEM_MEXEC_BASE.
zx_system_mexec_payload_get() returns ZX_OK on success.
ZX_ERR_NOT_SUPPORTED kernel.enable-debugging-syscalls is not set to true on the kernel command line.
ZX_ERR_BUFFER_TOO_SMALL If the provided buffer is too small for the ZBI. In this case, the caller is expected to make the syscall again with a larger buffer.
