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[PATCH v1 15/20] semihosting: Support SYS_HEAPINFO when env->boot_info i
From: |
Alex Bennée |
Subject: |
[PATCH v1 15/20] semihosting: Support SYS_HEAPINFO when env->boot_info is not set |
Date: |
Fri, 8 Jan 2021 22:42:51 +0000 |
From: Keith Packard <keithp@keithp.com>
env->boot_info is only set in some ARM startup paths, so we cannot
rely on it to support the SYS_HEAPINFO semihosting function. When not
available, fallback to finding a RAM memory region containing the
current stack and use the base of that.
Signed-off-by: Keith Packard <keithp@keithp.com>
Message-Id: <20210107170717.2098982-5-keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
hw/semihosting/common-semi.c | 43 +++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index ac1271545e..293791f721 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -137,6 +137,36 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ Int128 addr128 = int128_make64(addr);
+ if (subregion->addr <= addr && int128_lt(addr128, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
#ifdef TARGET_ARM
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
@@ -175,7 +205,18 @@ common_semi_rambase(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
const struct arm_boot_info *info = env->boot_info;
- return info->loader_start;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
}
#endif
--
2.20.1
- [PATCH v1 14/20] semihosting: Change internal common-semi interfaces to use CPUState *, (continued)
- [PATCH v1 14/20] semihosting: Change internal common-semi interfaces to use CPUState *, Alex Bennée, 2021/01/08
- [PATCH v1 20/20] semihosting: Implement SYS_ISERROR, Alex Bennée, 2021/01/08
- [PATCH v1 18/20] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ, Alex Bennée, 2021/01/08
- [PATCH v1 19/20] semihosting: Implement SYS_TMPNAM, Alex Bennée, 2021/01/08
- [PATCH v1 17/20] riscv: Add semihosting support for user mode, Alex Bennée, 2021/01/08
- [PATCH v1 16/20] riscv: Add semihosting support, Alex Bennée, 2021/01/08
- [PATCH v1 15/20] semihosting: Support SYS_HEAPINFO when env->boot_info is not set,
Alex Bennée <=