[PATCH v2 3/4] semihosting/arm-compat-semi: deref parameter register for SYS_HEAPINFO

[Alex Bennée]

As per the spec:

  the PARAMETER REGISTER contains the address of a pointer to a
  four-field data block.

So we need to follow the pointer and place the results of SYS_HEAPINFO
there.

Bug: https://bugs.launchpad.net/bugs/1915925
Cc: Bug 1915925 <1915925@bugs.launchpad.net>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 semihosting/arm-compat-semi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 733eea1e2d..2ac9226d29 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -1210,6 +1210,8 @@ target_ulong do_common_semihosting(CPUState *cs)
             retvals[2] = rambase + limit; /* Stack base */
             retvals[3] = rambase; /* Stack limit.  */
 #endif
+            /* The result array is pointed to by arg0 */
+            args = arg0;
 
             for (i = 0; i < ARRAY_SIZE(retvals); i++) {
                 bool fail;
-- 
2.20.1