hw/core/loader: Let load_elf() populate a field with CPU-specific flags

While loading the executable, some platforms (like AVR) need to
detect CPU type that executable is built for - and, with this patch,
this is enabled by reading the field 'e_flags' of the ELF header of
the executable in question. The change expands functionality of
the following functions:

  - load_elf()
  - load_elf_as()
  - load_elf_ram()
  - load_elf_ram_sym()

The argument added to these functions is called 'pflags' and is of
type 'uint32_t*' (that matches 'pointer to 'elf_word'', 'elf_word'
being the type of the field 'e_flags', in both 32-bit and 64-bit
variants of ELF header). Callers are allowed to pass NULL as that
argument, and in such case no lookup to the field 'e_flags' will
happen, and no information will be returned, of course.

CC: Richard Henderson <rth@twiddle.net>
CC: Peter Maydell <peter.maydell@linaro.org>
CC: Edgar E. Iglesias <edgar.iglesias@gmail.com>
CC: Michael Walle <michael@walle.cc>
CC: Thomas Huth <huth@tuxfamily.org>
CC: Laurent Vivier <laurent@vivier.eu>
CC: Philippe Mathieu-Daudé <f4bug@amsat.org>
CC: Aleksandar Rikalo <aleksandar.rikalo@rt-rk.com>
CC: Aurelien Jarno <aurelien@aurel32.net>
CC: Jia Liu <proljc@gmail.com>
CC: David Gibson <david@gibson.dropbear.id.au>
CC: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
CC: BALATON Zoltan <balaton@eik.bme.hu>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
CC: Thomas Huth <thuth@redhat.com>
CC: Artyom Tarasenko <atar4qemu@gmail.com>
CC: Fabien Chouteau <chouteau@adacore.com>
CC: KONRAD Frederic <frederic.konrad@adacore.com>
CC: Max Filippov <jcmvbkbc@gmail.com>

Reviewed-by: Aleksandar Rikalo <aleksandar.rikalo@rt-rk.com>
Signed-off-by: Michael Rolnik <mrolnik@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <1580079311-20447-24-git-send-email-aleksandar.markovic@rt-rk.com>

4 files changed, 5 insertions, 4 deletions

diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c
index 9eaa6e2..2e043cb 100644
--- a/hw/mips/mips_fulong2e.c
+++ b/hw/mips/mips_fulong2e.c
@@ -119,7 +119,7 @@ static int64_t load_kernel(CPUMIPSState *env)
                            cpu_mips_kseg0_to_phys, NULL,
                            (uint64_t *)&kernel_entry,
                            (uint64_t *)&kernel_low, (uint64_t *)&kernel_high,
-                           0, EM_MIPS, 1, 0);
+                           NULL, 0, EM_MIPS, 1, 0);
     if (kernel_size < 0) {
         error_report("could not load kernel '%s': %s",
                      loaderparams.kernel_filename,
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 5aaeaa8..34b76bb 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -1039,7 +1039,8 @@ static int64_t load_kernel(void)
     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
                            cpu_mips_kseg0_to_phys, NULL,
                            (uint64_t *)&kernel_entry, NULL,
-                           (uint64_t *)&kernel_high, big_endian, EM_MIPS, 1, 0);
+                           (uint64_t *)&kernel_high, NULL, big_endian, EM_MIPS,
+                           1, 0);
     if (kernel_size < 0) {
         error_report("could not load kernel '%s': %s",
                      loaderparams.kernel_filename,
diff --git a/hw/mips/mips_mipssim.c b/hw/mips/mips_mipssim.c
index 84c03dd..b934ca9 100644
--- a/hw/mips/mips_mipssim.c
+++ b/hw/mips/mips_mipssim.c
@@ -74,7 +74,7 @@ static int64_t load_kernel(void)
     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
                            cpu_mips_kseg0_to_phys, NULL,
                            (uint64_t *)&entry, NULL,
-                           (uint64_t *)&kernel_high, big_endian,
+                           (uint64_t *)&kernel_high, NULL, big_endian,
                            EM_MIPS, 1, 0);
     if (kernel_size >= 0) {
         if ((entry & ~0x7fffffffULL) == 0x80000000) {
diff --git a/hw/mips/mips_r4k.c b/hw/mips/mips_r4k.c
index fd926a3..b2aec43 100644
--- a/hw/mips/mips_r4k.c
+++ b/hw/mips/mips_r4k.c
@@ -98,7 +98,7 @@ static int64_t load_kernel(void)
     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
                            cpu_mips_kseg0_to_phys, NULL,
                            (uint64_t *)&entry, NULL,
-                           (uint64_t *)&kernel_high, big_endian,
+                           (uint64_t *)&kernel_high, NULL, big_endian,
                            EM_MIPS, 1, 0);
     if (kernel_size >= 0) {
         if ((entry & ~0x7fffffffULL) == 0x80000000) {